THE MOSQUITOES OF THE SOUTHEASTERN STATES 51 



Matecumbe, Fla., Brunswick, Ga., and Mound, La. Horsfall (62) 

 reported that it occurred in enormous swarms in southeastern 

 Arkansas following the spring floods. It is known only from the 

 Southern States and is usually rare. It has previously been recorded 

 from Mississippi, Louisiana, and Arkansas. The species is similar in 

 appearance to ferox, except that the white marking on the hind feet 

 is limited to the fourth tarsal segment and the thoracic scaling 

 (fig. 12, G) is somewhat different. 



PSOROPHORA CYANESCENS (Coq.) 



Psorophora cyanescens is recorded from Mississippi, Arkansas, 

 Louisiana, Texas, and Kansas. It is usually rare in most of the South, 

 but is reported as very abundant and annoying at times in Arkansas 

 (114) and Alabama (S. E. Shields). The adults are similar to those 

 of ferox except that the tarsi are entirely dark. 



PSOROPHORA HORRIDA (D. and K.) 



This is a rare species recorded from Arkansas, Tennessee, and 

 Mississippi. Its reported occurrence at New Orleans (118) appears 

 questionable. It is one of the four species of the subgenus Janthin- 

 osoma occurring in the United States. Matheson (92) has described 

 unusual male genitalic characters for this species. 



PSOROPHORA DISCOLOR (Coq.) 



Psorophora discolor occurs sparingly throughout the South, but it 

 has not yet been taken in Florida, The larvae have unusually large, 

 S-shaped antennae and long anal gills. The adults have well-defined 

 wing spots and are distinguished from P. signipennis by the char- 

 acteristic distribution of these spots, as given in the key. The writ- 

 ers' small series of specimens of this species are from Mound, La. 

 (G. H. Bradley), Loyton, Tenn. (S. E. Shields), and Paducah, Ky. 

 (G. E. Quinby). It has previously been recorded from Brewton, 

 Ala. (82), Lee County, Ga. (109), Scott, Ark. (114), southeastern 

 Arkansas (62), and from Charlotte, N. C, Clarksdale, Miss., and 

 Baton Rouge, La. (40). 7 



PSOROPHORA PYGMAEA (Theob.) 



This tropical species has been recorded once from the Florida 

 keys (Key West). 



PSOROPHORA SIGNIPENNIS (Coq.) 



Psorophora signipennis occurs in the arid western regions. It 

 was reported from Arkansas by Dyar (4-1). 



Genus MANSONIA Blanchard 



(Syn., Taeniorhynchus L.-Arr., Coquillettidia Dyar) 



The mosquitoes of this genus lay their eggs in rafts on marshes 

 or lakes having certain kinds of aquatic vegetation. Upon hatching, 

 the young larvae descend below the surface of the water and attach 

 themselves by inserting the tip of the air tube into the stems and 



7 Specimens of Psorophora discolor have recently been examined from Leon County. 

 Fla. (B. V. Travis), Decatur, Ala. (M. V. King), and McComb, Miss. (T. T. Bracken) 



