Dec, 1906.] Dyar and Knab: Larv^ of Culicid^. 207 



22. Air tube 11 x 1; upper head hair double; peeten of air tube moderate 



derivator 



Air tube 6 x i; upper head hair single; peeten long investigator 



Air tube 6 x i; upper head hair multiple; peeten rather long, .inhibitator 



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



length of the tube mutator 



Upper head hair single; tufts of tube all shorter than half its length 24 



24. Peeten of tube dense and fine, not as long as diameter of tube 25 



Peeten sparse and open, equalling the diameter of the tube at middle 



elevator 



25. Dorsal hairs stellate, long; antennae dark educator 



Dorsal hairs small ; antennae pale at base conspirator 



26. Air tube concave, the tip expanded 27 



Air tube regularly tapered, the tip not widened 28 



27. Peeten of air tube short; antennae pale at base; lateral comb of the eighth 



segment a large patch of spines territans 



Peeten of the air tube of long spines; antennae dark; lateral comb of 

 the eighth segment scarcely over two rows deep simulator 



28. Both head hairs single gravitator 



Upper head hair triple, lower single decorator 



Both head hairs triple or multiple 29 



29. Lateral abdominal hairs in threes after the second segment; body glabrous ; 



air tube not over five times as long as wide tar salts 



Lateral abdominal hairs in twos after the second segment; body spicular- 

 granular; air tube 6 x 1 3° 



30. Air tube with ten close tufts; antennae pale at base; dorsal tufts of anal 



segment 1 + 3 on each side secutor 



Air tube with six to seven sparse tufts; antennae dark; dorsal tufts of anal 

 segment 1 long + 1 long and one short lamentator 



31. Air tube very long with a swelling at outer fourth daumasturus 



Air tube uniform, without any swelling 3 2 



32. Air tube with slight tufts 33 



Air tube with single hairs or bare 37 



33. Peeten of the air tube reaching to one-third (Dr. Grabham) 34 



Peeten of the air tube reaching one-fourth or less 35 



34. Peeten short and broad, the tube 8x1, slightly curved forward; labial plate 



with subbasal tooth projecting micro squammosus 



Peeten long, the tube 10 x 1 ; labial plate with even teeth atratus 



35. Peeten dense and fine; lateral hairs in threes after the second segment 



carcinophilus 



Peeten sparse and long 36 



36. Lateral hairs in twos after the second segment; comb of the eighth seg- 



ment of very long spines rejector 



Lateral hairs in fours after the second segment; comb of shorter spines 

 and more . rows deep vector 



