TABLES OF AEDES AND HiEMAGOGUS 621 



31. Skin of body finely pilose cuneatus Dyar & Knab (p. 772) 



Skin of body nude 32 



32. Pecten-teeth of air-tube short, with very broad base. . tortilis Theobald (p. 808) 

 ...,, i, V, 1 infirmatus Dyar & Knab (p. 783) 

 Pecten-teeth long, their bases normal trivittatus CoquiUett (p. 775) 



33. Skin of body distinctly pilose 34 



Skin of body smooth or minutely spiculate. . euplocamus Dyar & Knab (p. 789) 



34. Anal segment short, the chitinous ring narrow; anal gills rudimentary, 



, , . ,., f tcrniorhynchus Wiedemann (p. G70) 



'^^^^-^^^^ Iniger Giles (p. 675) 



Anal segment at least as long as wide, the ring broad; anal gills normal 



fscapularis Rondani (p. 786) 

 \hracteatus CoquiUett (p. 803) 



35. Air-tube long, 4X1; tracheae narrow, angled fitchii Felt & Young (p. 684) 



Air-tube 3 X 1 or less 36 



36. Anal plate small, not covering over half the segment; anal gills large and 



sac-like, spotted varipalpus CoquiUett (p. 646) 



Anal plate over half encircling the segment; gills moderate 37 



37. Comb-scales tapered, a single median spine stouter or longer, differentiated 



from the rest 38 



Comb-scales bluntly rounded, the median spine resembling the rest 45 



Comb-scales bluntly rounded, without spinules 46 



38. Both pairs of dorsal head-hairs multiple 39 



Lower pair single or double (rarely three) 42 



39. Anal gills very short, bud-like; lateral hairs double on sixth abdominal 



segment cantator CoquiUett (p. 701) 



Anal gills well developed; lateral hairs of sixth abdominal segment single. . 40 



40. Chitinous parts deep brown pullatus CoquiUett (p. 739) 



Chitinous parts yellow-brown 41 



41. Anterior thoracic margin with a pair of long submedian hairs 



canadensis Theobald (p. 651) 

 Anterior thoracic margin without conspicuous submedian hairs 



curriei CoquiUett (p. 637) 



42. Lower pair of dorsal head-hairs double (or three) 43 



Lower head-hairs single 44 



43. Comb-scales with the lateral spines as long as the apical one 



grossbecki Dyar & Knab (p. 711) 

 Comb-scales with the lateral spines very short... hirsuteron Theobald (p. 745) 



44. Both pairs of dorsal head-hairs single aestivalis Dyar (p. 742) 



Upper head-hairs double stimulans Walker (p. 681) 



45. Antennae spinulated 47 



Antennae smooth, the spinules obsolete 50 



46. Lower pair of head-hairs double; secondary abdominal hairs not stellate 



H. albomaculatus Theobald (p. 870) 

 Lower head-hairs in fours; secondary abdominal hairs stellate, long 



H. splendens Williston (p. 866) 



47. Anal gills normal, moderate 48 



Anal gills very short, bud-shaped 49 



48. Both pairs of head-hairs single lazarensis Felt & Young (p. 734) 



Head-hairs in twos or threes 'fluviatilis Lutz (p. 721) 



49. Both pairs of head-hairs double squamiger CoquiUett (p. 708) 



Head-hairs single onondagensis Felt (p. 031 ) 



50. Pecten of very few sparse teeth; anal plate with long spines on hind margin 



busckii CoquiUett (p. 861) 

 Pecten of many close-set teeth ; anal plate without large spines 51 



51. Pecten followed by a single hair knabi CoquiUett (p. 842) 



Pecten followed by a tuft 52 



52. Pecten short, of close-crowded short teeth; body with coarse stellate tufts 



fiilvithorax Lutz (p. 846) 

 Pecten normal; body without conspicuous stellate tufts 53 



53. Both pairs of dorsal head-hairs single 54 



Dorsal head-hairs double and triple oswaldi Lutz (p. 818) 



54. Pecten of air-tube not reaching half-way, the tuft well beyond 



thorntoni Dyar & Knab (p. 820) 

 Pecten reaching middle of tube, the tuft placed close to its end 



podographicus Dyar & Knab (p. 814) 



