162 D. W. COQUILLETT. 



29.— Posterior edge of axillary cell broiully l)orflered with brown 30. 



Posterior edge of axillary cell largely hyaline 49. Willi^jitoiiii. 



oO. — Pile of sides of abdomen prevailingly yellowish, first antenual joint yel- 

 lowish, brown of wings with a yellowish tinge 48. alplia. 



Pile of sides of abdomen prevailing black, first antennal joint black, brown 



of wings with a blackish tinge ,51. <'ey.x. 



31. — Veins at bases of first and fourth posterior cells bordered with subhyaline..32. 

 Veins at bases of fir.st and fourth posterior cells never bordered with sub- 

 hyaline 34. 



32. — Base of third antennal joint elongate-conical, extreme base of discal cell 



hyaline .33. 



Base of third antennal joint subglobular, extreme base of discal cell brown. 



42. |>ai*vi<'oriii««. 

 33. — Sides of third abdominal segment with black i)ile, brown of wings encloses 



a hyaline spot at base of second submarginal cell 44. pertii^^a. 



Sides of third abdominal segment destitute of black pile, brown of wings 



does not enclose, etc 43. niigatoi*. 



34. — Apex of wings wholly brown, but little lighter than the basal part 35. 



Apex of wings j)ure hyaline or grayish, noticeably lighter than the basal 



part 36. 



35. — Posterior margins of abdominal segment black tonientose, legs largely black. 



47. luciler. 

 Posterior margins of abdominal segments destitute of black tonientum, legs 



reddish 4(). tegniiiiipeiinis. 



3fi. — Venter partly or wholly reddish 37. 



Venter wholly black, front tibise destitute of bristles, pile of sides of ab- 

 domen prevailingly whitish 46. var. Saclceiiii, 



.37. — Epistonia much produced, front tibiiu destitute of bristles. 



48. var. rtiligiiiosa. 



Epist(mia retreating, front tibiae provided with bristles 24. llli»iOella. 



38. — Apex of discal cell pure hyaline, vein at its apex alone rarely bordered with 



brown 39. 



Apex of discal cell (especially along the veins) brown 52. 



39. — Epistonia but little or not at all produced, first two antennal joints of nearly 



an equal length, base of the third subglobular or short conical 40. 



Epistonia much produced, first antennal joint usually al)out twice as long 



as the second, base of the third elongate-conical 45. 



40. — Tonientum of occiput white , 42. 



Tomentuni of occiput yellowish, no cloud on veins at base of second sub- 

 marginal and second posterior cells 41. 



41. — Second and third abdominal segments wholly black tonientose, front tibise 



destitute of bristles, claws of front tarsi minute 30. bigratlafa. 



Second and third abdominal segments largely yellowish tomentose, front 

 tibiae provided with bristles, claws of front tai-si well developed. 



41. i>lagO!!ia. 

 42. — Wings destitute of a brown cloud on veins at bases of .second submarginal 



and second posterior cells, claws of front tarsi small 43. 



Wings with a brown cloud on veins at bases of second submarginal and 



second iiosterior cells, claws of front tarsi large 32. cautoi*. 



43. — Outline of brown of wings irregular and curved, apex of axillary cell hya- 

 line 44. 



