88 American Midland Naturalist Monograph No. 3 



in artificial wooden receptacles and in rock holes. The larvae are predacious, 

 feeding on mosquito larvae and other aquatic animals with which they are 

 associated in their breeding places. 



Tribe Culicini 



The tribe Culicini is represented in the Southern United States by nine 

 genera, most of which are divided into subgenera. It is by far the largest of the 

 three tribes of Culicinae, both in number of species and individuals. 



SALIENT CHARACTERS. — Adult: Clypeus longer than broad, rounded an- 

 teriorly. Proboscis slender, flexible, not hooked. Thorax arched above. Scutel- 

 lum trilobed, each lobe bearing a distinct group of setae. Abdomen clothed 

 with imbricate scales. Cross-vein 3-4 not bent at right angles, no spur extend- 

 ing basally from angle of vein 3. Wing without V-shaped thickening of mem- 

 brane between veins 5.1 and 5.2. Second marginal cell about as long as its 

 petiole (much shorter in U rano taenia) . Larva: Head rarely rotatable. Hairs 

 of body never pinnately branched as in Anophelini. Thorax broad and without 

 eversible organs. Abdomen without float-hairs. Eighth segment with a siphon. 

 Lateral comb always present on eighth segment. 



Keys to the Genera 



ADULTS 



1.2nd marginal cell short, less than half as long as its petiole 



_ Uranotaenia L. A., p. 100 



2nd marginal cell at least as long as its petiole 2 



2. Postnotum with a tuft of setae; squamae without a fringe of hairs 



IV^eom^ia Theob., p. 89 



Postnotum' bare; squamae with a fringe of hairs 3 



3. Spiracular bristles present 4 



Spiracular bristles absent - - J 



4. Postspiracular bristles present; tip of abdomen pointed Psorophora R. D., p. 130 



Postspiracular bristles absent; tip of abdomen blunt Culiseia Felt, p. 107 



5. Postspiracular bristles present o 



Postspiracular bristles absent ' 



6. Wing scales very broad; tip of abdomen blunt (in part) ....Mansonia Blanch., p. 120 

 Wing scales narrow (rarely moderately broad) ; tip of abdomen pointed 



Aedes Meigen, p. 165 



7. Antennae much longer than proboscis, first flagellar segment longer than the next 



three combined Deinocerlles Theob., p. 274 



Antennae not longer than proboscis or only slightly so, first flagellar segment about 

 as long as each succeeding segment -- " 



8. Scutum bicolorous, with delicate longitudinal lines of white scales; penultimate 



segment of fore tarsi very short, only about as long as wide 



Orlhopodomyla Theob., p. 1 14 



Scutum unicolorous, not marked with white longitudinal lines; penultimate seg- 

 ment of fore tarsi much longer than wide 9 



9. Wing scales very broad, brown and white mixed Mansonia Blanch., p. 120 



Wing scales narrow, uniformly dark Culex Linn., p. 237 



LARVAE (fourth INSTAR) 



1. Distal half of siphon strongly altentuated, adapted for piercing roots of aquatic 



plants Mansonia Blanch., p. 120 



