56 MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 
Southeast it has been recorded from all the States except Florida. A 
reported occurrence in New Orleans, La. (7/46), is considered question- 
able. It is one of the four species of the subgenus Janthinosoma oc- 
curring in the United States. Matheson (7/7) has described unusual 
male genitalic characters for the species, and Rozeboom (135) has 
given the first description of the larva, which he found to have long 
antennae, similar to those of Psorophora ferox. The two species were 
taken together and were found only in shaded pools. The adults of 
both species have the last two segments of the hind tarsi white, but 
in ferox the broad whitish scales of the mesonotum are scattered (as 
in P. cyanescens) whereas in horrida they are segregated 1n patches at 
the sides (as in P. varipes). 
PSOROPHORA DISCOLOR (Cogq.) 
Psorophora discolor occurs sparingly throughout the South. 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 characteristic distribution of these spots, as 
given in the key. The writers’ specimens of this species are from 
Mound, La. (G. H. Bradley), Loyston, Tenn. (S. E. Shields), 
Paducah, Ky. (G. E. Quinby), McComb, Miss. (T. T. Bracken), 
Decatur, Ala. (W. V. King), Leon County, Fla. (B. V. Travis), and 
Monroe, La. (EK. B. Johnson). Previously published records are for 
Brewton, Ala. (1705), Lee County, Ga. (124), Scott, Ark. (742), 
southeastern Arkansas (79), Huntsville, Ala. (736), Charlotte, N. C., 
Clarksdale, Miss., and Baton Rouge, La. (50). It has recently been 
reported from South Carolina (table 1). 
PSOROPHORA PYGMAEA (Theob.) 
This tropical species has been recorded once from the Florida keys 
(Key West) (85). The collection was made in 1901 and the species 
has not since been reported from the United States. 
PSOROPHORA SIGNIPENNIS (Coq.) 
Psorophora signipennis occurs in the arid western regions. It 
was reported from Arkansas by Dyar (57), and Carpenter (47) has 
since reported it from Dyess, Ark. The writers have a single larva, 
apparently of this species, from Mercedes, Tex. (sent in by P. T. 
Riherd), in which the hairs at the tip of the air tube are rather 
long, about two-thirds as long as in larvae of P. cyanescens from the 
same locality, and do not therefore agree with the characters usually 
given in keys for the separation of these species. The larva, how- 
ever, 1s readily distinguished on other characters, as shown in the 
present key. 
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 
roots of aquatic plants, through which they obtain air. The pupae 
se 
