New species and new records of predaceous midges in the genera, Schizonyxhelea Clastrier and Stilobezzia Kieffer from Mexico (Diptera: Ceratopogonidae) Author Huerta, Herón Author Grogan, William L. text Zootaxa 2017 4294 4 401 418 journal article 32636 10.11646/zootaxa.4294.4.1 f3e2e226-a609-453b-995f-b5bee31a5642 1175-5326 832774 AEE0A680-3206-4AFA-968D-5EC5313738D6 Key to Adult Stilobezzia of Mexico 1 Females .............................................................................................2 - Males..............................................................................................14 2 Wing with 1 radial cell; fore femur with 2–4 stout black ventral spines........... S . ( Eukraiohelea ) elegantula (Johannsen) - Wing with 2 radial cells; fore femur without ventral spines.....................................................3 3 Wing membrane with numerous macrotrichia primarily in cells r3 and m1 ( Fig.17 ) … S . ( Acanthohelea ).................4 - Wing membrane bare or with a few macrotrichia only on anterior margin in cell r3 S . ( Stilobezzia )......................5 4 Scutellum yellow on mid portion; wing hyaline.............................................. S . ( A .) fuscula Wirth - Scutellum dark brown; wing infuscated ( Fig. 17 )............................................ S . ( A .) spinellii , n. sp. 5 Wing with 2 or 3 dark spots on anterior margin.............................................................. 6 - Wing hyaline or infuscated, without dark spots on anterior margin..............................................10 6 Fore tibia with numerous small dark spots; scutum with short anterior tubercle..................................... 7 - Fore tibia without numerous small dark spots; scutum with or without anterior tubercle........................... … 8 7 Wing with 2 dark spots, on r-m crossvein and very small one at base of 2nd radial cell................. S . ( S .) kiefferi Lane - Wing with 3 dark spots, on r-m crossvein, and 2 others at base and apex of 2nd radial cell........... S . ( S .) punctulata Lane 8 Mesonotum yellow, without anterior tubercle; wing hyaline, with distinct brown spots on r-m crossvein and at level of 2nd radial cell; legs yellow, narrow apices of hind femur and tibia brown.......................... S . ( S .) coquilletti Kieffer - Mesonotum brown, with anterior tubercle; wing brownish, anterior margin with 2 or 3 dark spots; legs with extensive brown bands............................................................................................... 9 9 Fifth tarsomeres with ventral batonnets; wing with 3 dark spots, including 1 on apex of 2nd radial cell.... S . ( S .) rabelloi Lane - Fifth tarsomeres without ventral batonnets; wing with 2 dark wing spots, none on apex of 2nd radial cell.. S . ( S .) beckae Wirth 10 Fifth tarsomeres with ventral batonnets................................................................... 11 - Fifth tarsomeres without ventral batonnets.................................................................13 11 Mid femur blackish on proximal 2/3; abdomen shining black......................... S . ( S .) femoralis Lane & Forattini - Mid femur pale; abdomen pale green or yellowish...........................................................12 12 Femora, tibiae whitish, hind femur with faint dark apical band.................................. S . ( S .) glauca Macfie - Femora, tibiae yellowish, hind femur with solid dark apical band............................... S . ( S .) maculata Lane 13 Mesonotum dark brown, with large pruinose gray spots; tibiae with sub-basal pale bands.............. S . ( S .) hirta Borkent - Mesonotum uniform light grayish brown without spots; tibiae without bands............... S . ( S .) pallidiventris (Malloch) 14 Wing with 1 radial cell; fifth tarsomeres with ventral batonnets; fore femur with 3–4 ventral spines.......................................................................................... S . ( Eukraiohelea ) elegantula (Johannsen) - Wing with 2 radial cells; fifth tarsomeres with or without ventral batonnets; fore femur without ventral spines...........15 15 Wing with 2 or 3 dark spots on anterior margin............................................................. 16 - Wing without dark spots...............................................................................20 16 Fore tibia with numerous small dark spots; scutum with short anterior tubercle.................................... 17 - Fore tibia without numerous dark spots; scutum with or without anterior tubercle..................................18 17 Aedeagus with an oblique pair of doubly sinuate sclerites with sickle-shaped apices; parameres with slender tapered apices that are abruptly bent ventrocephalad.......................................................... S . ( S .) kiefferi Lane - Aedeagus with a pair of dark brown lateral sclerites with pointed tips; parameres separate with 2 elongate sclerites with sharply pointed apices that are posteriorly directed................................................ S . ( S .) punctulata Lane 18 Hind tibia with stout, black setae on dorsal surface; parameres with a pair of basolateral L-shaped sclerites..................................................................................................... S . ( S .) rabelloi Lane - Hind tibia without stout, black setae on dorsal surface; parameres without a pair of basolateral L-shaped sclerites........19 19 Legs yellow, narrow apices of hind femur and tibia brown; aedeagal sclerites with rounded apices... S . ( S .) coquilletti Kieffer - Legs dark brown, hind femur with narrow subapical lighter band; aedeagal sclerites with slender apices that are recurved 120̊, tips pointed.......................................................................... S . ( S .) beckae Wirth 20 Wing membrane with numerous macrotrichia primarily in cells r3 and m1 ( Fig. 16 ) S. ( Acanthohelea )..................21 - Wing membrane bare or with a few macrotrichia on only anterior margin of cell r3… S . ( Stilobezzia )....................22 21 Gonocoxite with an elongate black spine on mesal margin; parameres with apices gradually narrowed to fine apical filaments that are recurved...................................................................... S. ( A .) fuscula Wirth - Gonocoxite without an elongate black spine on mesal margin; parameres with distal portions broad, straight, apicolateral mar- gins spoon-like ( Figs. 21, 23 )........................................................... S. ( A .) spinellii , n. sp. 22 Abdomen with distinctive dark stripes on tergites 4–5 or single dark band on 5.................................... 23 - Abdomen without distinctive dark markings on tergites.......................................................24 23 Aedeagus with an oblique pair of long, straight, slender, sclerotized bars.......................... S . ( S .) glauca Macfie - Aedeagus with oblique pair of sclerotized bars, apices gradually narrowed to a fine apical filament..... S . ( S .) maculata Lane 24 Abdomen shining black; hind femur black........................................ S . ( S .) femoralis Lane & Forattini - Abdomen yellow or pale; hind femur yellow or pale brown...................................................25 25 Gonostylus tapering distally to slender pointed tip.................................... S . ( S .) pallidiventris (Malloch) - Gonostylus not tapered, with broad rounded apex............................................. S . ( S .) hirta Borkent