24 INSECUTOR INSCITI^ MENSTRUUS 



Black, with silvery-white pollen. Inner edge of parafron- 

 tals, vertex, ocellar area, mesoscutum, and scutellum light 

 golden. Pleurae, coxse, outside of front femora, rest of head, 

 and broad bases of abdominal segments 2 to 4 silvery-white. 

 Palpi and labella pale yellow. End of second antennal joint 

 and base of third pale rufous. UnpoUinose parts of abdomen 

 polished black. Legs black. Wings clear. Squamae and 

 squamulae watery-white. The silvery-white pollen is seen in 

 oblique view to cover the blackish f rontalia. 



Male with abdomen broadly yellow on base, showing in 

 tergal lunule on each side extending back to front corner of 

 third segment, and including whole venter to middle of same 

 segment. Front tibiae of male are testaceous, those of female 

 hardly less so. 



Holotype, No. 19467, U. S. Nat. Mus., female, TD371. 

 Allotype, male. Paratypes include TD4453, female. 



Family LARV^^VORID^ 



Larvaevoropsis new genus. 



Genotype, Bchinomyia dakotensis Townsend, 1892, Trans. 

 Am. Ent. Soc. XIX, 94. 



Differs from Larvcevora as follows : Whole body much nar- 

 rower, the abdomen not especially broadened, form Peleteria- 

 like. Second antennal joint of female hardly more than one 

 and one-fourth times the third, that of male shorter. Front 

 of male at vertex about two-thirds eye-width, that of female 

 about equal to eye-width. Third antennal joint of male not 

 strongly broadened apically. Cheeks of male about one-half 

 of eye-height, those of female a little broader. Parafacials 

 with sparse bristly hairs, not pilose. Strong apical decussate 

 pair of scutellar macrochaetse ; four laterals, the alternating 

 ones weak, especially so in female ; two discal pairs, the an- 

 terior pair widely separated and forming with the other pair 

 an arcuate row. No median marginal bristles on first abdomi- 

 nal segment, only a median marginal pair on second, a loose 

 marginal row on third, loose marginal and discal on fourth 

 segment. Abdominal macrochsetse not nail-like or truly spine- 



