228 MOSQurroES of north America 



26. Head-hairs in threes microsguamosus Grabham (p. 405) 



Head-hairs in fours and sixes pinaroeampa Dyar & Knab (p. 253) 



27. Air-tube 8X1, the tufts 3-haired and short; antennae dark 



fhaiilitator Dyar & Knab (p. 263) 

 \eremita Howard, Dyar & Knab (p. 262) 

 Air-tube 6X1, the tufts 2-haired and long; antennas pale at base 



factor Dyar & Knab (p. 372) 

 Air-tube 7X1, the tufts 2-haired and sho^t^ 



caraij^eus Howard, Dyar & ICnab (p. 257) 

 Air-tube 7X1, the tufts single and very long; antennae pale 



similis Theobald (p. 341) 



28. Air-tube 5X1, pecten teeth about 15; subdorsal hairs of abdominal segments .- 



3 and 4 double pipiens Linnaeus (p. 366) 



Air-tube 5X1, pecten teeth about 11; subdorsal hairs of abdominal segments 



3 and 4 double revocator Dyar & Knab (p. 345) 



Air-tube 4X1, pecten teeth about 10; subdorsal hairs of abdominal segments 



3 and 4 double comitatus Dyar & Knab (p. 370) 



Air-tube 4X1, pecten teeth about 9; subdorsal hairs of abdominal segments 



3 and 4 single guinguefasciatus Say (p. 354)' 



Air-tube 5X1, pecten teeth about 11; subdorsal hairs of abdominal segments 



3 and 4 in threes stigmatosoTna Dyar (p. 237) 



29. Air-tube with a subapical crown of spikes; body pilose 



coronator Dyar & Knab (p. 288) 



Air-tube without a crown of spikes, smooth throughout 30 



30. Air-tube with long well-defined tufts 31 



Air-tube with small double or single hairs, or bare 46 



31. Body spicular-pilose 32 



Body glabrous or lightly granular 40 



32. Five tufts on posterior margin of the tube subequal in length, short 33 



Five tufts on tube with basal one long, the rest progressively shorter; abdom- 

 inal hairs in threes on segments 3 to 5 36 



33. Lateral abdominal hairs in twos on segments 3 to 5 34 



Lateral abdominal hairs in fours or threes on segments 3 to 5 35 



34. Air-tube 11 X 1; upper head-hair double; pecten of the air-tube moderate 



derivator Dyar & Knab (p. 292) 

 Air-tube 6 X 1; upper head-hair single; pecten long 



investigator Dyar & Knab (p. 381) 

 Air-tube 6X1; upper head-hair multiple; pecten rather long 



inhiHtator Dyar & Knab (p. 393) 



35. Air-tube 9X1 atratus Theobald (p. 390) 



AirtiihP K V 1 ftrochycampa Dyar & Knab (p. 331) 



^ Xabominator Dyar & Knab (p. 380) 



36. Comb only two rows deep, large scales; body long-pilose 



chrysonotum Dyar & Knab (p. 312) 

 Comb three rows deep 37 



37. Upper head-hair triple; tufts of tube long, the basal one over half the length 



of the tube 38 



Upper head-hair single or double; tufts of tube all shorter than half its 



length 89 



38. Body hairy; upper head-tuft of three long hairs, mutator Dyar & Knab (p. 423) 

 Thorax only hairy, abdomen glabrous; upper head-tuft of four short hairs 



bastagariiis Dyar & Knab (p. 425) 



39. Pecten of tube dense and fine, not as long as diameter of tube 



conspirator Dyar & Knab (p. 411) 

 Pecten sparse and open, equalling the diameter of tube at middle; air-tube 



often blackish banded mesially ,. . elevator Dyar & Knab (p. 416) 



40'. Air-tube concave, the tip expanded 41 



Air-tube regularly tapered, the tip not widened !!!!!!."!!! 42 



41. Pecten of air-tube short; antennae pale at base; lateral comb of the eighth 



segment a large patch of spines territans Walker (p. 296) 



Pecten of the air-tube of long spines; antennae dark; lateral comb of the 

 eighth segment scarcely over two rows deep 



simulator Dyar & Knab (p. 302) 



