210 Mosquitoes 



39. Last vein of wing with three black spots. Thorax 



not distinctly marked. 



Anoplieles crucians, Wiedemann. 



Last vein of wing with not more than two black 



spots. Thorax with distinct, broad, light 



median stripe 40. 



40. Scales at base and tip of last vein black, remainder 



white Anopheles punctipennis, Say. 



Scales on basal half of last vein white, remainder 

 black Anopheles franciscanus, McCracken. 



41. Tibiae and distal ends of femora with nearly erect 



scales, scales of thorax forming a dark stripe, 

 irregular toward hinder end. 



Psorophora Junvardii, Coquillett. 

 Tibiae and femora without erect scales 42 



42. Thorax with three lines of metallic violet scales. 



Scales of wings chiefly broad 43 



Thorax without metallic violet scales 44 



43. Median metallic stripe on thorax moderately 



broad and extending to hinder margin. 



Uranotcenia sapphirina, Osten Sacken. 

 Median stripe narrow and extending two-thirds 

 of the way to hinder margin. 



Uranotcenia socialis, Theobald. 



44. Chitin of thorax light yellow and with a black 



mark on each side of the middle, extending 

 from the posterior margin about half way to 

 the anterior. 



Ochlcrotatiis bimaculatus, Coquillett. 

 Chitin not so marked 45 



45. Scales of thorax distinctly of two colours or 



shades, in distinct stripes, patches, or spots. .46 



Scales of thorax usually of one colour, sometimes 



of two colours, but never forming distinct 



stripes or patches 57 



