OF WASHINGTON, VOLUME XVII, 1915 99 



EXPLANATION OF PLATE. 



Fig. 1, Exoristoides slossonce Coq head 



Fig. 2, Exoristoides slossonce Coq wing 



Fig. 3, Exoristoides johnsoni Coq head 



Fig. 4, Exoristoides johnsoni Coq wing 



Fig. 5, Homalactia harringtoni Coq head 



Fig. 6, Homalactia harringtoni Coq wing 



MOSQUITOES ATTACKING 'A FROG. 



BY R. C. SHANNON, Bureau of Entomology. 



A bullfrog (Rana catesbeiana) , was seen sitting upon a log in 

 a swamp at Dead Run, Fairfax County, Virginia, May 23, 1915, 

 and upon it were a number of mosquitoes which arose from his 

 back in a small swarm when he moved at my approach. The 

 mosquitoes returned as soon as the frog became quiet again and 

 resumed their feeding. When first seen the frog appeared to 

 be unaware of the blood-suckers. When nearer approach was 

 attempted the frog jumped into the water leaving the mosquitoes 

 behind. Four specimens were captured and these have been 

 determined by Mr. Knab as Culex territans Walk.; their abdo- 

 mens were distended and the imbibed blood showed through the 

 integument. 



Mr. Knab informs me that there has been considerable doubt 

 that Culex territans sucks blood. In spite of the fact that the 

 species is very common in the eastern United States and breeds 

 everywhere in smaller collections of water, no definite feeding 

 record of it has been made, and it has been doubted if it would 

 attack man or other warm-blooded animals. The present obser- 

 vation suggests that the species may confine its attacks to frogs 

 and perhaps other cold-blooded animals. 



