160 D. W. COQUILLETT. 



Table of Genera. 



1. — Wings with a, crossvciii between second vein and anterior branch of the 



third 2. 



Wings destitute of sucli a crossvein (present in rare instances) 4. 



2.— Wings distinctly liyaline and brown ; abdomen with blacls pile or totuen- 



tum 3. 



Wings pale yellovA'ish, the apex hyaline; jnle and tomentum of abdomen 



wholly yellowish 1. junctura. 



3. — Greater portion of anal and axillary cells hyaline; the hyaline band cn)ss- 



ing discal cell extends to marginal cell 2. soi'peutina. 



Greater portion of anal and axillary cells brown ; the hyaline crossband ex- 

 tends only to first posterior cell 3. Keenii. 



4. — Anal cell wholly pure hyaline ; wings hyaline, sometimes with darker spots ; 



scutellum wholly black, except in adamhrata 5. 



Anal cell never wholly pure hyaline; wings largely or wholly brown. ...25. 

 5.— Wings wholly pure hyaline, except sometimes the costal and first basal 



cells 6. 



Wings with brown spots (especially on crossveins), or else base of wings 



largely tinged with smoky 14. 



6. — Sides of abdomen abundant pilose 7. 



Sides of abdomen very sparse pilose, epistoma considerably produced, pile on 



front part of breast black; length 6-7 mm 12. turbata. 



7. — Sides of third abdominal segment with black pile 8. 



Sides of third abdominal segment destitute of black pile 11. 



8. — Abdomen destitute of bronze -colored tomentum 10. 



Abdomen with bronze-colored tomentum 9. 



9. — Fourth abdominal segment wholly bronze-colored tomentose, front tibiae 



destitute of bristles 5. uebtilo. 



Fourth abdominal segment destitute of bronze-colored tomentum, front 



tibia", provided with bristles 4. ienea. 



10. — Fifth and sixth abdominal segments with deep reddish-brown tomentum. 



6. coiisesi<»or. 

 Fifth and sixth abdominal segments destitute of reddish-brown tomentum. 



7. al tern at a. 

 11. — Abdomen with cro.ssbands of yellowish tomentum, or else wholly and 



densely whitish or yellowish tomentose 12. 



Abdomen destitute of crossbands of yellowish tomentum, never wholly 

 whitish or yellowish tomentose, the sides destitute of black pile. 



9. fulviaiia. 

 12. — Face and first two antennal joints black, first antennal joint subglobular at 



its base, claws of front tarsi small 13. 



Face and first two antennal joints reddish, third antennal joint elongate- 

 conical at its base, claws of front tarsi well developed. ..8. ineree(Iii§. 

 13. — Apex of male abdomen silvery tomentose, breast destitute of black pile, 

 black bristles on front edge of antecostal cell very sparse. .10. iniic'orea. 

 Apex of male abdomen destitute of silvery tomentum, black bristles on 



front edge of antecostal cell abundant 11. iiiolitoi*. 



14. — Wings with brown spot in marginal cell above base of second snbmarginal 



cell, and one in middle of first posterior cell 13. probo»itci(Iea. 



Wings destitute of these spots 15. 



