Carpenter et al.: Mosquitoes of Southern U. S. 145 



DISTRIBUTION. — Southern Canada; eastern United States westward to 

 Nebraska and Texas; Mexico; We^t Indies; Central and South America. 

 Southern States: Alabama (170); Arkansas (30); Florida and Georgia (52); 

 Kentucky (140); Louisiana and Mississippi (52); Missouri (1); North Caro- 

 Hna (166); South Carohna (64); Tennessee (52); Virginia (49). Other 

 States: Delaware (106); District of Columbia (52); Illinois (42); Indiana 

 (76); Iowa (155, 156); Kansas (128); Massachusetts (52); Michigan (88); 

 Minnesota (147); Nebraska (178); New Jersey (77); New York (160); 

 Oklahoma (159); Pennsylvania (121); Texas (108); Wisconsin (48). 



BIONOMICS. — The adults of P. ferox are usually encountered in or near 

 thickets or forests following rainy periods during the summer months. The 

 females are persistent and painful biters. Larvae are found in temporary rain- 

 filled pools in thickets and woodlands and occasionally in pot holes in stream 

 beds. Larvae and adults occur from March to November in the extreme South, 

 but are more common from May to September farther north (4th Sv. C. Med. 

 Lab. reports, 1942-1944, unpublished). 



PsoROPHORA (Janthinosoma) horrida (Dyar and Knab) 



Aedes horridus Dyar and Knab, 1908, Proc. U. S. Nat. Mus., 35:56 (in part). 

 Psorophora (Janthinosoma) horrida. Roth, 1945, Proc. Ent. Soc. Wash., 47:1 (synon- 

 ymy given). 



ADULT female. — Medium sized species. Head: Proboscis long, dark scaled; 

 palpi dark, less than one-third as long as proboscis, with the fourth segment 

 usually curved, and about equal in length to the first three segments combined. 

 Occiput dorsally with a large median patch of broad recumbent whitish to 

 pale-yellow scales; a patch of broad appressed purplish scales present laterally, 

 margined below by a patch of broad appressed yellowish scales. Pale erect 

 forked scales numerous on central portion of occiput. Thorax: Integument of 

 scutum black, with a broad longitudinal median stripe of lanceolate dark 

 bronzy-brown scales; the longitudinal median stripe margined laterally with 

 broad whitish to pale yellow scales, which extend down over the posterior pro- 

 notum anteriorly; prescutellar space margined with broad pale scales. Abdo- 

 men: First tergite entirely or primarily pale scaled; remaining tergites dark 

 purplish scaled dorsally, with apical patches of pale yellow scales laterally 

 (often absent on VII). Venter yellowish scaled, except for segment VII and 

 bases of IV to VI, dark scaled. Legs: White knee spots present. Femora I and 

 II dark purplish scaled except for pale inner surfaces (outer surface of femur 

 I pale at base) ; femur III with the basal half to two-thirds pale on all aspects. 

 Tibiae and tarsi of fore and middle legs entirely dark scaled; segments 4 and 5 

 of hind tarsus, and occasionally the apex of segment 3. white scaled, other 

 segments dark (segment 4 rarely with dark scales as well as white) ; scales of 

 segments 1 and 2 of hind tarsus and apical portion of hind tibia somewhat 

 suberect, appearing rather shaggy. Wing: Scales narrow, dark. 



ADULT MALE. — Coloration similar to that of female. Proboscis slender, of 

 about equal width for its entire length, not swollen apically. Palpus with the 



