86 



NORTH AMERICAN DIPTERA 



Culicidaj I. — Lateral view of thorax of: 1, Uranotaenia loewii; 2, Theobaldia morsitans; 

 3, Anopheles punctipennis; 4, Psorophora ciliata ; o, Megarhinus septentrionalis. (After 

 Matheson, courtesy C. C. Thomas). 



l.m.e., lower mesepimeral bristles; pa., prealar bristles; pe., prothoracic bristles; pn., 

 pronotal bristles; p.sp., postspiracular bristles; ps., prosternal or propleural bristles; sp., 

 spiracular bristles; st.p., sternopleural bristles; u.me., upper mesepimeral bristles. 



