90 



NORTH AMERICAN DIPTERA 



Culicidse III. — 1, Megarhinus; 2, Megarhinus, d head; 3, Aedes, wing vena- 

 tion; 4, Haemagogus; 5, Haemagogus, front claws of d ; 6, Wyeomyia, $; 7, 

 Chaoborus, posterior tarsus. 



3^.ua 2""-" ,^st,,,„ 



Venation of Aedes. 



m-cu r-m 



J 



2da 



cu. 



Venation of Anopheles, giving Comstock-Needham terminology and that 

 of Schiner, etc. (in brackets). Veins. — C, costal; Sc, subcostal (auxiliary); 

 R, (first longitudinal); R2, R3, (second longitudinal); R4+0, (third longitudinal); 

 M,+2, M3 (fourth longitudinal); Cu„ Cus (fifth longitudinal); 2 da., (sixth longi- 

 tudinal); r-m, radio-medial crossvein (anterior crossvein); ni-cu, medio-cubital 

 crossvein (posterior crossvein). Cells. — a, Sc, (subcostal); b, Ri, (first marg- 

 inal); c, Ri (second marginal); d, R3 (submarginal) ; e, R., (first posterior); f, 

 M2, (second posterior); g, Ms (third posterior); h. Cu, (fourth posterior); i, Cu; 

 (anal); j, 2a, (axiliary). (After Matheson, courtesy C. C. Thom.as). 



