PSOKOPHORA SIGNIPENNIS 575 



Abdomen subeylindrical, flattened, posterior segments strongly tapered; dor- 

 sal vestiture of metallic blue-black scales, with large, subquadrate, posterior, 

 lateral segmentary patches of creamy white ones joined beneath into longitudi- 

 nal stripes; first segment entirely white scaled and with many pale setae; venter 

 clothed entirely with flat yellowish-white scales, except the seventh segment, 

 which is blue black beneath. 



Wings rather broad, hyaline ; petiole of second marginal cell a little shorter 

 than its cell, that of second posterior cell about equal to its cell ; basal cross- 

 vein distant about its own length from anterior cross-vein ; veins brown ; scales 

 black, outstanding ones on outer half of wing broadly linear. Halteres yel- 

 lowish white, with white scales at tips. 



Legs moderately long ; femora pale, especially beneath, clothed with yellowish- 

 white scales, the tips blue black, middle pair dark scaled above to base; knees 

 dusky scaled; posterior tibiae and first tarsal joint with a few obliquely out- 

 standing scales; tibiae and tarsi blue black, except penultimate joint of hind 

 tarsi, which is white on basal two-thirds in the type; other specimens have a 

 varying amount of white, one having nearly the whole joint white, while in one 

 the white is wanting, the hind tarsi being entirely black. Claw formula, 

 1.1-1.1-1.1. 



Length : Body about 3.5 mm.; wing 3 mm. 



Life history and habits unknown. 



Bahama Islands. 



Nassau, New Providence, June 22, 1903 (T. H. Coffin) ; Lake Cunningham, 

 New Providence, February 15, 1915 (H. G. Dyar) ; Current Settlement, Eleu- 

 thera, June 22, 1903 (T. H. Coffin) ; Tarpum Bay, Eleuthera, 1903 (T. H. 

 Coffin). 



Psorophora coffini was identified by Coquillett as his Conchyliastes varipes; 

 this latter has proved to be a synonym of Psorophora discrucians Walker. 

 Psorophora coffini comes nearest to P. johnstonii Grabham, differing by its 

 smaller size, more slender legs with smoother scaling of the hind pair, and 

 minor colorational differences. The Culex cyanescens recorded by Coffin from 

 Tarpum Bay is a specimen of this species in which the white of the hind tarsi 

 is obsolete. 



PSOROPHORA SIGNIPENNIS (Coquillett). 



Tceniorhyncfius signipennis Coquillett, Proc. Ent. Soc. "Wash., vi, 167, 1904. 

 Twniorhynchus signipennis Dyar, Journ. N. Y. Ent. Soc, xii, 244, 1904. 

 Feltidia signipennis Dyar, Journ. N. Y. Ent. Soc, xiii, 55, 1905. 

 Feltidia signipennis Dyar, Proc. Ent. Soc. Wash., vii, 47, 1905. 

 Taeniorhynchus signipennis Blanchard, Les Moust., 631, 1905. 

 Janthinosoma signipennis Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 183, 1906. 

 Orabhamia signipennis Coquillett, U. S. Dept. Agr., Bur. Ent., Tech. Ser. 11, 21, 1906. 

 Twniorhynchus (? Culex) signipennis Theobald, Mon. Culic, v, 432, 1910. 

 Oeiginal Desceiption of Twniorhynchus signh-ennis : 



Distinguished by the apical half of the costa of each wing being covered with light 

 yellow scales with the exception of two patches of black ones. 



9. ^Brown, varied with yellowish, the bases of the antennae, a broad band at 



middle of the proboscis, the first tarsal joint except the apex and a ring near the 

 base, also the bases of the following joints, very narrowly on the last two, yellow. 

 Scales of palpi and the upright ones on the occiput mixed black and light yellow, 

 the appressed scales of the occiput and mesonotum light yellow, those on the abdo- 

 men chiefly white, on the femora and tibiae mixed black and light yellow, not form- 

 ing distinct bands or spots, those on the tarsi black except at bases of the joints and 

 the broad median portion of the first, which are chiefly whitish; on the second joint 

 of the hind tarsi the whitish scales cover its basal half; tarsal claws not toothed. 

 Wing-scales mixed black and light yellow, the former collected into three spots, two 

 on the apical half of the costa and one on the sixth vein at a point near three-fourths 

 of its length; scales on apical half of the costa and of the sixth vein wholly yellow 

 with the exception of the patches of black scales; of the latter, the first one on the 

 costa is slightly longer than the second and equals about one-half of the yellow in- 



