2 I 2 



Mosquitoes 



5 i . Thorax thickly clothed with golden yellow scales, 

 except for the median, narrow, dark line and 

 the semicircular lateral line on the posterior 



third Odilcrotatas abserratus, Felt. 



Thorax with sides and front end, also back of 

 head, whitish-scaled. Two patches of brown 

 at base of thorax for about half length. 



OcJUerotatus pre tans, Grossbeck. 



52. Middle of thorax light, sides dark 53 



Middle of thorax dark, sides light 55 



53. Light median stripe of thorax extends to scutel- 



lum 54 



Light median stripe confined to anterior two- 

 thirds of thorax. 



OcJUerotatus infirmatus, Dyar and Knab. 



54. Median light stripe of thorax narrower than 



lateral dark spaces and distinctly demarcated. 



OcJUerotatus serratus, Theobald. 



Median light stripe of thorax broader than lateral 



dark spaces, outlines not distinctly demarcated. 



OcJUerotatus dupreei, Coquillett. 



55. With black stripe on sides as well as in middle 



of thorax, the middle stripe parallel-sided. 



OcJUerotatus trivittatus, Coquillett. 



Without black stripe on sides of thorax, the dark 



middle mark of irregular outline 56 



56. Sides of thorax white-scaled. 



OcJUerotatus triseriatus, Say. 

 Sides of thorax golden-yellow-scaled. 



OcJUerotatus aurifer, Coquillett. 



57. First long joint of antennae over three times as 



long as any other joint. 



Deinocerites cancer, Theobald. 



First long joint of antenna; never twice as long 



as any other joint 58 



