574 MOSQUITOES OF NORTH AMERICA 



broadly linear or ligulate, those on fork of second vein denser and slightly 

 broader. Halteres pale, with dark tips and some pale scales at apex. 



Legs rather long, moderately stout, posterior tibiae and first tarsal joints 

 slightly thickened by some obliquely outstanding scales; femora clothed with 

 small, flat yellowish white scales basally, upper side beyond base and apical 

 fourth clothed with black scales with a bright blue luster, the middle pair dark 

 scaled nearly to base ; tips of middle and posterior femora rather broadly white 

 scaled; tibiae and tarsi black with a bright blue luster; penultimate joint of hind 

 tarsi white except at its tip. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Life history and habits unknown. 



Jamaica and Cuba, West Indies. 



Cayamas, Cuba, May 3 (E. A. Schwarz). Also recorded from Jamaica (Dr.- 

 Grabham) . 



Psorophora johnstonii agrees with the description of Janthinosoma arri- 

 hdlzagcB Giles, which is a synonym of P. discrucioms. Giles defines his species 

 as having an " unadorned thorax," i. e., the mesonotum without a central stripe 

 of black scales. However, this is an error, due to the poor condition of Arri- 

 bAlzaga's specimen, Giles's species being based upon the description and figure 

 of that author. 



PSOROPHORA COFFINI (Dyar & Knab). 



Janthinosoma varipes Coffin (not Coquillett), in Shattuck, The Bahama Ids., 281, 



1905. 

 Culex eyanescens Coffin (not Coquillett), in Shattuck, The Bahama Ids., 283, 1905. 

 Janthinosoma cofflni Dyar & Knab, Proc. Biol. Soc. Wash., xix, 134, 1906. 

 Janthinosoma cofflni Theobald, Mon. Cullc, v, 603, 1910. 



Origin Ai Desckiption or Janthinosoma coftini: 



Hind legs without raised scales; tarsi without pale basal bands; penultimate joint 

 of hind tarsi white, the last dark; thorax all yellow scaled above; tips of mid and 

 hind femora dusky. Agrees with the description of J. varipes Coquillett, but a 

 careful examination of the types of that species shows there to be dark scales on the 

 center of the thorax and that it is a synonym of J. discrueians Walker, as identified 

 by Coquillett. 



8 specimens, Nassau, Bahamas, B. W. I., June 22, 1903 (T. H. Coffin). 



Type. — Cat. No. 9969, U. S. Nat Mus. 



Desceiption op Femaie or Psorophoea coffini (Male and Laeva Unknown) : 



Female. — Proboscis cylindrical, uniform, slender, labellse conically tapered; 

 vestiture of dense black scales with a blue luster; setae very small, those on 

 labellas more prominently outstanding. Palpi about one-fourth as long as pro- 

 boscis, thick, densely clothed with blue-black scales, with a few long black seta\ 

 Antennae moderate ; joints subequal, blackish, rugose, pilose ; tori subspherical, 

 with a cup-shaped hollow at tip, blackish, and a patch of white scales on inner 

 side; hairs of whorls sparse, moderate, black. Clypeus elliptical, prominent, 

 blackish, nude. Eyes black. Occiput convex, black, clothed with rather broadly 

 elliptical sordid-white scales and many erect, forked ochraoeous ones, especially 

 posteriorly, a small patch of black scales on sides next eye; bristles small, 

 blackish, some short pale yellowish ones projecting at vertex. 



Prothoracic lobes moderate, remote, blackish, clothed with broad, curved, 

 sordid yellowish-white scales and blackish bristles. Mesonotum black, rather 

 evenly covered with broad, curved yellowish-white scales intermixed on disk 

 with some narrower blackish ones not forming a distinct stripe ; bristles short, 

 black, rather numerous. Scutellum trilobate, black, clothed with yellowish- 

 white scales and about eight black bristles on each lobe. Postnotum elliptical, 

 blackish, nude. Pleurae clothed with flat white scales which pass continuously 

 into the light-colored scales on disk of thorax; coxae pale brown, with a few 

 white scales and rows of blackish bristles. 



