616 MOSQUITOES OF NORTH AMERICA 



17. Proboscis of the female white ringed 18 



Proboscis of the female not white ringed 22 



18. Abdomen dark with a dorsal longitudinal pale stripe '. 19 



Abdomen dark without such a stripe 21 



19. Abdomen with sides and dorsal stripe concolorous 20 



Abdomen with white lateral spots, not concolorous with dorsal stripe 



solUcitans Walker (p. 658) 



20. Wing-scales wholly dark; last hind tarsal wholly white 



mitcheVUB Dyar (p. 665) 

 Wing-scales dark with pale ones intermtzed; last hind tarsal black at apex 



nigromaculis Ludlow (p. 655) 



21. White rings of hind tarsi moderate, last joint wholly white 



twniorliynchus Wiedemann (p. 667) 

 Tarsal rings small, last joint black with narrow white ring, niger Giles (p. 672) 



22. Abdomen yellowish scaled, unhanded fletclieri Coquillett (p. 675) 



Abdomen yellowish with dark scales Intermixed and ill-contrasted pale 



bands 23 



Abdomen with distinct segmental white bands 24 



23. Lateral scales of mesonotum yellow riparius Dyar & Knab (p. 712) 



Lateral scales of mesonotum creamy white 



euedes Howard, Dyar & Knab (p. 714) 



24. Tarsi black with white rings 25 



Tarsi yellowish with small pale rings, euochms Howard, Dyar & Knab (p. 716) 



25. Wing-scales broad, black and white 26 



Wing-scales narrow, mostly brown 27 



26. Salt-marsh species from the Pacific coast. ..'. squamiger Coquillett (p. 705) 



Inland species from the Atlantic States grossiecki Dyar & Knab (p. 708) 



27. Abdominal bands broken, reduced to mesial and lateral spots 



•fluviatilis Lutz (p. 717) 

 Abdominal bands continuous 28 



28. Mesonotum with silvery-white lines. 29 



Mesonotum without such lines; clypeus nude 30 



29. Mesonotum without a median white line; clypeus scaled 



caiopus Meigen (p. 824) 

 Mesonotum with a median white line; clypeus nude 



mediovittata Coquillett (p. 821) 



30. White rings of hind tarsi broad; hind claws of female toothed. (Distin- 



guishable with certainty only as lary^e and by male genitalia) 



'fitcMi Felt & Young (p. 682) 

 sansoni Dyar & Knab (p. 686) 

 stimulans Walker (p. 679) 

 abfitchii Pelt (p. 688) 

 yittata Theobald (p. 691) 

 White rings of hind tarsi narrow; hind claws of female often simple. . . 31 



31. Terminal segments of abdomen above with basal pale bands 



sylvestris Theobald (p. 694) 

 Terminal segments of abdomen above largely white-scaled 



eantator Coquillett (p. 700) 



32. Mesonotum golden brown or with brown stripes on a yellowish or gray 



ground 33 



Mesonotum with strongly contrasting pale or dark stripes or spots 47 



33. Abdomen yellowish-brown with blackish lateral stripe, most distinct pos- 



teriorly testaceus van der Wulp (p. 717) 



Abdomen black with lateral white spots 35 



Abdomen with white scales at bases and apices of segments and some 



centrally, the black scales often reduced to a pair of spots or absent. 34 

 Abdomen with concrete basal pale segmental bands 36 



34. Wing with basal halves of costa and first vein white scaled 



spencerii Theobald (p. 723) 

 Wing with costa and first vein black scaled nearly to base 



idahoensU Theobald (p. 727) 



36. Mesonotum wholly dark brown scaled nuiilus Theobald (p. 721) 



Mesonotum laterally yellow scaled aurifer Coquillett (p. 766) 



36. Abdomen with the sides continuously whitish 37 



Abdomen with the sides not continuously white 38 



37. Mesonotum wholly reddish brown scaled fuacus Osten Sacken (p. 729) 



Mesonotum laterally pale scaled idahoensis Theobald (p. 727) 



38. Mesonotum with a distinct brown double median stripe 39 



Mesonotum not so marked 42 



