OF WASHINGTON, VOLUME XVII, 1915 163 



margin of eyes. Arista black, bare, bulbous at extreme base. Facial 

 plate very small, vibrissal angles closely approximated, vibrissa? rather 

 weak, but distinct and strongly cruciate, situated well above oral margin. 

 Cheeks in both sexes nearly as wide as eye-height, the anterior two-thirds 

 occupied by the transverse impression which is greatly expanded and dark 

 brown in color. Posterior part of cheeks and occiput cinereous. Facial 

 ridges practically bare. A row of long, slender, ventrally directed macro- 

 chaetac extends on the face from opposite tip of second antennal joint to 

 lower corner of eye, the longest of these subequal in length with arista. 

 Front, on the sides, clothed with short black hairs arranged in more or less 

 regular rows. Proboscis extremely short, labella fleshy, brown, palpi 

 black, bearing a distinct brush of forwardly directed bristles at their tip. 

 Thorax grayish brown, vittse indistinct, pleurae cinereous, sternopleurals 

 usually three, many long erect hairs also present near them. 



> 



Fig. 1-3. Xeophyto nocturnalis Walton. 



Dorso-central bristles three; sometimes an irregularly placed fourth 

 one present. Scutellum bearing three strong pairs of marginals, apical 

 pair obsolete, Disc of same in the male bearing many long, nearly erect 

 hairs, in addition to a discal pair. Abdomen elongate ovate in female, 

 distinctly elongate and nearly cylindrical in male, slightly marmorate or 

 pseudo-maculate as viewed from the rear. Also traces of a median vitta 

 present in well-preserved specimens. Each segment bearing both discal 

 and marginal macrochaita) although the former are sometimes asymmet- 

 rically placed. A slightly metallic sheen apparent on the darker portions 

 of segments. Genitalia in both sexes retracted. Legs, including cox;e 

 black, claws of male elongated, pulvilli fuscous. Wings (fig. 3) narrow. 

 veins distinctly black. Costal spine fully as long as small cross vein. 

 Apical cell closed slightly before costal margin entering same well before 

 tip of wing. Bend of fourth vein distinctly angulatcd, bearing a wrinkle. 

 Third vein bristly, nearly half way to small cross vein, squama- yellowish 

 white, head of haltere fuscous. The posterior cross vein in this genii- i.~ 

 subject to freakish developments; a specimen of setosa Coq. (fig. 2) in the 



