36 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
Janthinosoma sayi Dyar and Knap, Journ. N. Y. Ent. Soc., vol. 14, p. 181, 
1906. 
Janthinosoma sayi THEOBALD, Mon. Culic., vol. 4, p. 155, 1907. 
A large brown mosquito, the hind legs shortly shaggy and tipped 
with white. Palpi, legs, and abdomen black with blue reflections. 
Head with dense erect golden scales; mesonotum with sparse golden 
scales; abdomen blue-black dorsally, with lateral triangular apical 
seemental yellow patches, confluent with the golden yellow venter; 
legs blue-black, the vestiture of the hind pair shortly erect, tip of 
third tarsal and all of the fourth and fifth white. Wings slightly 
smoky, the scales narrow, all dark. 
The larvae live in temporary rain puddles, and develop rapidly. 
The period of larval life is. very short. The winter is passed in 
the egg state, the eggs being spinose and adapted to withstand 
desiccation. The adult is generally rare, but conspicuous when 
seen. It will bite in daytime in the open, but is never numerous 
enough to be troublesome. 
Distribution —Atlantic and Gulf States to southern Ontario, 
Cuba, and Bahamas. This is a northern subspecies of Psorophora 
posticatus Wiedemann of tropical America. 
United States Records. 
MASSACHUSETTS: Springfield, July 16, 1903 (F. Knab). 
DISTRICT OF COLUMBIA: Washington, September 9, 1901 (W. E. Hinds). 
VirciniA: Glencarlyn, July 23, 1901 (N. Banks). 
Luray, September 2, 1906 (I*. Knab). 
NortH CAROLINA: Greensboro, August 8, 1901 (F. C. Pratt). 
SoutH CAROLINA: Columbia, August 1, 1906 ( Die 
GrorGIA: Brunswick, May 21, 1915 (R. H. Von Ezdorf). 
FLorma: West Tampa, March 18, 1905 (H. G. Dyar). 
Mississiprr: Agricultural College, May 18, 1901 (G. W. Herrick). 
LOUISIANA: Mound, June 12, 1915 (S. L. Walker). 
TENNESSEE: Athens, August, 1904 (H. S. Barber). 
KENTUCKY: Corbin, August 24, 1904 (H. S. Barber). 
Missour1: Charleston, June 14, 1918 (K. C. Sullivan). 
ARKANSAS: Helena, July 30, 1904 (H. S. Barber). 
TrExAS: Dallas, August 31, 1906 (F. C. Pratt). 
WISCONSIN: Saxeville, July 29, 1909 (B. K. Miller). 
Iowa: Algonquin (H. J. Quayle). 
PSOROPHORA (JANTHINOSOMA) HORRIDUS Dyar and Knab. 
Aédes horridus DyAR and Knap, Proc. U. S. Nat. Mus., vol. 35, p. 56, 1908. 
A large black mosquito, with shaggy blue-black legs, the last two 
hind tarsal joints white. Thorax black scaled in the middle, the 
sides broadly yellowish white scaled; head yellowish white scaled. 
Abdomen blue-black, with apical segmental lateral yellowish spots; 
