Monographic revision of the genus Aegidinus Arrow (1904) and generic phylogeny of the world Orphninae (Coleoptera: Scarabaeidae: Orphninae). Author Colby, Julia text Insecta Mundi 2009 2009-05-08 2009 76 1 41 journal article 10.5281/zenodo.5352584 1942-1354 5352584 Aegidinus howdenorum Colby , new species Fig. 52-55 , 68 , 88 Type Material. Holotype female at HAHC labeled: a) “ Colombia , N. de // S. 1000 m . 3 km . // N. Chinacota // May 10, 1974 // H. & A. Howden ” (printed, rectangular label)/ b) “ H. & A. Howden Collection Ottawa , Canada ” (printed, rectangular label with a black border)/ c) my handwritten holotype label. Male allotype from CMNC labeled: a) as (a) above/ b) “ Aegidinus // guianensis // (Westw.) Det. H. F. Howden 70” (handwritten and printed, rectangular label with a black border)/ c) my handwritten allotype label. Paratypes . One male paratype at HAHC labeled: a) “ Colombia , N. de // S. 1000 m . 3 km . // N. Chinacota // May 10, 1974 ” (printed, rectangular label)/ b) “S. Peck Carrion // traps #10” (handwritten and printed rectangular label)/ c) “H. & A. Howden Collection Ottawa, Canada ” (printed, rectangular label with a black border)/ d) “ Aegidinus // n. sp// Det. F. C. Ocampo” (handwritten and printed, rectangular label with a black border)/ e) my printed paratype label. Type locality. Colombia , Norte de Santander , Chinacota ( 3 km N). Figures 50- 64. Male genitalia. Scale bar = 1 mm. 50) Parameres (frontal view) of A. guianensis . 51) Parameres and part of phallobase (lateral view) of A. guianensis . 52) Parameres (frontal view) of A. howdenorum . 53) Parameres and part of phallobase (lateral view) of A. howdenorum . 54) Ventral plate of A. howdenorum . 55) Lateral lobe of A. howdenorum . Arrow indicates notch. 56) Parameres (frontal view) of A. howeae . 57) Parameres and part of phallobase (lateral view) of A. howeae . 58) Parameres (frontal view) of A. oreibates . 59) Parameres and portion of phallobase (lateral view) of A. oreibates . 60) Ventral plate of A. oreibates . 61) Parameres (frontal view) of A. petrovi . 62) Parameres and part of phallobase (lateral view) of A. petrovi . 63) Parameres (frontal view) of A. teamscaraborum . 64) Parameres and part of phallobase (lateral view) of A. teamscaraborum . Description. Holotype female . Length 7.6 mm ; width 4.3 mm . Color : Head, pronotum and elytra piceous to reddish brown. Venter and legs reddish brown. Head : Frons impunctate to sparsely or moderately densely punctate, punctures small. Frontoclypeal suture obsolete. Clypeus moderately densely punctate to rugopunctate; punctures small. Pronotum : Surface punctate; punctures moderate to dense, moderate to large, concentrated on sides. Basal margin with bead and row of punctures, punctures obsolete adjacent to scutellum. Disc with round, punctate depression; punctures moderate to dense, moderate in size. Anterior margin with median boss. Elytra: Punctures of striae elongate, vermiform, occasionally U- or Vshaped at base. Stria 1 obsolete at base. Lateral margin adjacent to humerus with 5 setose crenulations. Legs : Protibia lacks apical denticle. Genitalia : Fig. 68 . Allotype . Male. Length 9.1 mm ; width 4.7 mm . Allotype differs from holotype in the following respects: Head : Frons slightly concave medially. Frons impunctate at base, sparse to moderately densely punctate anteriorly, punctures small. Clypeus punctate to rugopunctate; punctures moderate to dense, small. Anterior margin of clypeus with subtriangular, nearly erect horn, carina extending from base to horn laterally to each eye canthus. Pronotum : Both the bead and row of punctures on basal margin obsolete adjacent to scutellum. Disc with subtriangular fovea, posterior edge bordered by a subtriangular tumosity on either side. Fovea with a few large, dense, round to transverse punctures. Scutellum : Surface with a few moderately dense, small punctures. Elytra : Elytral punctures elongate, vermiform, kidney-shaped, round, or oval, occasional V-shaped at base. Lateral margin adjacent to humerus with 4 (left) or 5 (right) setose crenulations. Legs : Protibia with apical denticle. Genitalia : Fig. 52-55 . Paratype . One male. Length 6.8 mm ; width 3.5 mm . Paratype differs from allotype in the following respects: Head : Anterior margin of clypeus without horn, clypeus slightly tumid. Pronotum: Disc with longitudinal, ovate depression. Elytra : Striae 1 and 2 obsolete at base. Lateral margin adjacent to humerus with 4 setose crenulations. Diagnosis. This species is best distinguished by using the female and male genitalia. Females are most similar to A. candezei and A. venezuelensis . Female A. howdenorum ( Fig. 68 ) do not have a longitudinal carina on the superior sclerite, a character that separates them from A. candezei (which does have a longitudinal carina, Fig. 66 ). The spinulose region on the superior plate of A. howdenorum projects outward, while in A. venezuelensis ( Fig. 77 ), the spinulose region projects downwards. The male genitalia are similar to those of A. oreibates and A. crypticus . In A. howdenorum ( Fig. 52-55 ) the ventral plate is rounder than in A.oreibates ( Fig. 58-60 ). Aegidinus howdenorum has a notch on the lateral lobe (best seen in lateral view, Fig. 55 ), which is not present in A. crypticus ( Fig. 49 ). Etymology. This species is named in honor of Henry and Anne Howden. The type series for this species (and a great deal of the material for this revision) came from their collection. Distribution (Fig. 88). Colombia. Three specimens examined from HAHC and CMNC. COLOMBIA (3): Norte de Santander : Chinacota ( 3 km N) (3). Temporal Distribution. May (3). Natural History. All three specimens were collected at an elevation of 1000 m , and one was collected in a carrion trap. Remarks. The female was the most complete of all three specimens , and thus is selected as the holotype .