206 Mosquitoes 



13. With basal and apical bands and lateral spots 



(almost stripes) and white median line on ab- 

 dominal segments. (Salt water usually.) 



Oclilcrotatus onondagensis, Felt. 1 

 With basal bands only on abdominal segments. 14 



14. Stripe on thorax black, placed in the middle. 



Oclilcrotatus atropalpus, Coquillett. 

 Stripes on thorax white 15 



15. Silvery white lines on thorax, irregularly expand- 



ing into spots, one of the lines median. 



Oclilcrotatus varipalpus, Coquillett. 

 Silvery white lines on thorax all narrow and 

 sharply marked, no white median line, re- 

 mainder of scales dead black with a very few 

 scattered light scales of brown. 



Pneumacitlcx signifer, Coquillett. 



16. Scales of abdomen black except at the bases of 



the segments 17 



Scales of abdomen yellow and with a pair of black 

 spots of scales on all but first and last segments. 

 (Fresh water.) 



Oclilcrotatus currici, Coquillett. 



17. Wings with two large black spots on each. Light- 



coloured basal bands of abdominal segments 

 very distinct. . . Thcobaldia incidens, Thomson. 

 Wings unspotted. Light-coloured basal bands 

 of abdomen not very distinct. Last joint of 

 hind tarsi white. 



Oclilcrotatus canadensis, Theobald. 



18. Proboscis strongly curved downward 19 



Proboscis not strongly curved downward ... .20 



1 The thorax of this species varies. 



