. Bulletin. Natural history; Natural history. Nov., 1980 Irwin & Lyneborg: The Genera of Nearctic Therevidae 235. Fig. 136-141. — lilolinga ocula (Adams) male lerminalia. 136. — Left gonocoxile with appendages and aedeagus in dorsal view. 137. — Left gonocoxite with appendages in ventrolateral view. 138. — Epan- drium with appendages in dorsal view. 139. — Aedeagus in loteral view. 140. — Tergite 8. 141. — Slernite 8. Scale: mm. Type-species: Psilocephala acuta Adams 1903: 222 by present designation. Type- locality: Englewood, Clark County, Kansas. i Diagnosis Small- to medium-sized, u
. Bulletin. Natural history; Natural history. Nov., 1980 Irwin & Lyneborg: The Genera of Nearctic Therevidae 235. Fig. 136-141. — lilolinga ocula (Adams) male lerminalia. 136. — Left gonocoxile with appendages and aedeagus in dorsal view. 137. — Left gonocoxite with appendages in ventrolateral view. 138. — Epan- drium with appendages in dorsal view. 139. — Aedeagus in loteral view. 140. — Tergite 8. 141. — Slernite 8. Scale: mm. Type-species: Psilocephala acuta Adams 1903: 222 by present designation. Type- locality: Englewood, Clark County, Kansas. i Diagnosis Small- to medium-sized, usually slen- der species. Head. — Compound eyes of male al- most touching for a considerable dis- tance; eyes of male of two distinct facet sizes, with a linear indentation on eye surface where different facet sizes meet. Frons of female (Fig. 17) extremely wide, more than 3X width of ocellar tubercle at level of antennal insertion and more than 2X width of ocellar tubercle at vertex. Frons of male has light to dark brown velvety patch con- tiguous with each compound eye; frons sf female usually has distinct rounded, dark brown velvety spot contiguous with ;ach compound eye (one undescribed iperies from Texas has minute crescent- ihaped velvety patches). Frons and face ii both sexes completely tomentose; to- nentum buff to brown; frons and upper ace of male without pile or setae; frons of female has scattered, sparse, short setae above velvety spots, otherwise up- per face and frons without pile or setae. Genae protrude as lobes below compound eyes (Fig. 16), always with a patch of darker brown tomentum running to sub- cranial cavity. Head triangular in shape when viewed from side, with ocelli form- ing upper point, base of genae a second and antennal insertion a third, with an- tennae placed very low on head. Ocellar tubercle has many short setae angled forward, originating mainly from pos- terior portion. Head X as deep as antennal length; scape of mal
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
