Taxonomic purgatory: Sorting out the wasp genus Myzinum Latreille in North America (Hymenoptera, Tiphiidae, Myzininae) Author Kimsey, Lynn S. text Zootaxa 2009 2224 30 50 journal article 10.5281/zenodo.190193 71dc1d04-e694-4c9b-bc7c-ab528b6540ed 1175-5326 190193 Key to the North American species of Myzinum 1 Metasoma with 7 visible segments, apical sternum forming slender hook (uncus); antenna 13-segmented, usually held straight, not coiled; body long slender; males....................................................................................................... 2 - Metasoma with 6 visible segments, apical sternum not slender or hook-like; antenna 12-segmented, usually coiled; body robust; females ................................................................................................................................................... 10 2 Forewing marginal cell Rs vein obsolescent or indicated by stained line (Fig. 3); hypostomal angle obtuse in side view; paramere ventral lobe with 3–4 peg-like spines apically (Fig. 7) .................. cocoritensis Kimsey, new species - Forewing marginal cell Rs vein present (Fig. 6); hypostomal angle forming right or acute angle in side view; paramere ventral lobe with slender spines apically (as in Fig. 8)................................................................................. 3 3 Metasomal tergum VII with medial longitudinal groove or crease (as in Fig. 11).......................................................4 - Metasomal tergum VII flat, without medial longitudinal groove or crease.................................................................. 5 4 Wing membrane evenly brownish yellow; tergum VII usually marked with yellow; volsella flat, apically rounded ... ............................................................................................................................................ quinquecinctum (Fabricius) - Wing membrane largely hyaline, darkened at tip; tergum VII black, without yellow; volsella triangular in cross-sec- tion, pointed apically .......................................................................................................................carolinanum Panzer 5 Midcoxa dentate, lobate or broadly angulate on inner margin (as in Fig. 5)................................................................ 6 - Midcoxa unmodified..................................................................................................................................................... 7 6 Midcoxa lobate or dentate (Fig. 5); paramere ventral lobe less than 3x as long as broad basally, margin above notch angulate, ventral lobe having spines along apical fourth of length ( Fig. 21 ) ............................... obscurum (Fabricius) - Midcoxa broadly angulate; paramere 3.5x or greater as long as broad basally, margin above notch linear, ventral lobe having spines along three-fourths of length ( Fig. 17 ) .......................................................................... frontalis Cresson 7 Hindcoxa with small, low tooth on inner margin; paramere ventral lobe with spines extending along more than half length; volsella triangular in cross-section ( Fig. 16 ) ....................................................................... dubiosum (Cresson) - Hindcoxa without small tooth on inner margin; paramere with ventral lobe spines extending along one-third length or less; volsella various ................................................................................................................................................. 8 8 Paramere medial notch absent, ventral lobe undeveloped, not distinguished from dorsal lobe; volsella as long or nearly as long as paramere ventral lobe (as in Fig. 19 ); aedeagus not apically bulbous, narrowly enlarged apically, with ventral ridge narrow, not lamellate ....................................................................................................................... 9 - Paramere medial notch deep, clearly separating ventral from dorsal lobe; volsella one-third to one-half as long as paramere ventral lobe; aedeagus apically bulbous, greatly inflated, more than twice as broad as shaft below, ventral ridge broadly lamellate ( Fig. 20 ) ......................................................................................................... navajo Krombein 9 Flagellomere I 1.4–1.6x as long as broad; volsella triangular in cross-section. ......................... maculatum (Fabricius) - Flagellomere I 1.2–1.3x as long as broad; volsella flat in cross-section ........................................ confluens (Cresson) 10 Forewing marginal cell Rs vein obsolescent or indicated by stained line; hypostomal angle obtuse in side view ( Fig. 1 ) ............................................................................................................................... cocoritensis Kimsey, new species - Forewing marginal cell Rs vein present (as in Fig. 6); hypostomal angle forming right angle or acute angle in side view (as in Fig. 2 ) ....................................................................................................................................................... 11 11 Propodeal side smooth, without striae or ridging ....................................................................... carolinianum (Panzer) - Proodeal side longitudinally or obliquely striate or ridged......................................................................................... 12 12 Pronotal disk with numerous tiny punctures between larger ones across most of surface, accompanied by short bristle-like orange or yellow setae ........................................................................................................ fulviceps ( Cameron ) - Pronotal disk without numerous tiny punctures between larger ones or only a few tiny ones anteriorly, with scattered pale or black setae ....................................................................................................................................................... 13 13 Propodeum posteriorly entirely covered with coarse ridges radiating out from petiolar socket ....... navajo Krombein - Propodeum posteriorly smooth or with weak radiating striae .................................................................................... 14 14 Scutum and scutellum entirely black, without yellow markings; metasomal terga with lateral yellowish, ovoid spots not bands ....................................................................................................................................... obscurum (Fabricius) - Scutum and scutellum black with yellow markings; one or more metasomal terga with complete or medially broken yellow band ................................................................................................................................................................. 15 15 Antenna pale red; wing membrane yellowish brown; pronotal disk with anterolateral yellow spot and broad posterior band; ocellocular distance about twice as long as interocellar distance; body length 18–22 mm ........................... ............................................................................................................................................ quinquecinctum (Fabricius) - Antenna brownish red to black; wing membrane untinted; bicolored or infuscate; pronotal disk coloration variable; ocellocular distance usually less than twice as long as interocellar distance; body length less than 18 mm ............. 16 16 Forewing with costal margin dark, infumate, rest of wing untinted; pronotal disk beyond anterior margin at least partly bipunctate unless punctures confluent .............................................................................. maculatum (Fabricius) - Forewing entirely hyaline or uniformly infuscate; pronotal disk usually not bipunctate beyond anterior margin .... 17 17 Metasomal terga I–V with anterior and posterior transverse yellow bands ................................... confluens (Cresson) - Metasomal terga I–V only with anterior transverse yellow band or lateral spots ...................................................... 18 18 Wings hyaline ...................................................................................................................................... frontalis Cresson - Wings brown-tinted, at least along costal margin .............................................................................. dubiosum Cresson