INSECUTOR INSCITIJE MENSTRUUS 63 



NEW ANDEAN SPALLANZANIINE FLIES 



By CHARLES H. T. TOWNSEND 



Chaetocnephalia, new genus. 



Genotype, Chcetocnephalia alpina Townsend, new species. 



Differs from Cnephalia by the parafacial bristles being as 

 strong as frontals and peristomals, and arranged in two ir- 

 regular rows. Front tarsi of female not appreciably widened ; 

 head longer, parafacials about two-thirds width of eye ; female 

 with two proclinate outer and three or four reclinate inner 

 orbital bristles, the latter closely approximated or bunched : 

 second aristal joint about three times as long as wide, third 

 antennal joint of female but little longer than the elongate 

 second joint; two rows of inwardly directed frontal bristles 

 on each side in the female ; beside the two rows of strong 

 parafacial bristles there is a third row of weak ones along 

 orbit. Facialia not ciliate, a few bristles immedately next 

 vibrissas ; proboscis horny, stout, slightly longer than head- 

 height ; palpi long, curved, a little thickened apically ; post- 

 vertical bristles small and short, normal, only one pair; only 

 one occipitocentral bristle on each side. Four sternopleural 

 and four postsutural bristles. Abdomen of female flattened, 

 macrochsetse only marginal. Apical cell closed in border far 

 before wing-tip, hind crossvein nearer bend, last section of 

 fifth vein nearly or quite one-half as long as preceding sec- 

 tion, costal spine quite long, third vein bristly only at base. 



Chaetocnephalia alpina, new species. 



Length of body, 9.5 mm. ; of wing, 8 mm. One female, 

 Oroya, Peru, March 7, 1913 (Townsend). On short herbage. 



Blackish in ground color, submarmorate with silvery white. 

 Whole face and front strongly silvered, except the black 

 ocellar area, the faintly silvery frontalia and the pale yellow- 

 ish prominent epistoma ; the varying incidence of light presents 

 successively dark parafacials except a silvery fleck above and 

 below on orbital margin, a broad transverse band of dark from 

 eye to eye across antennal base extending broadly along orbits 

 to vertex, and lastly a broad dark stripe taking up the pos- 



