40 



PSYCHE. 



[ April iSSS. 



conspicuously hairy in front and at 

 sides, bare and shining in middle ; sepa- 

 rated from mesoscutum by a rather 

 deep transverse groove with two large 

 coarsely punctate and hairy foveae. 

 Dorsal outline of thorax consequently 

 broken at scutellum. Tegulae shining, 

 smooth, slightly embrowned. Meta- 

 thorax hairy above and on sides. 



Abdomen obovate, not narrowed at 

 tip, smooth, shining, except first seg- 

 ment, wdiich is covered with long gray 

 hairs above and beneath, and the tip of 

 the abdomen, which is slightly hairy at 

 posterior edges of segments. Second 

 segment with elongate basal foveae 

 above, and a longitudinal basal groove 

 on each side beneath, slightly concave 

 to the margin, and extending two- 

 thirds the length of the segment. 



Antennae ten-jointed, black, with 

 scape long, sinuous, and not clavate, 

 and reaching to top of head. Club 

 five-jointed in female, six-jointed in 

 male, not compressed, more hairy than 

 scape and funicle. First joint of latter 

 obovate ; second small, one-half to one- 

 third the third, — the latter excurved 

 and obliquely truncate in male, similar 

 to fourth in female. First joint of club 

 obcoiiical, remaining joints, except tlie 

 last, quadrate, nearly equal in length, 

 about two-thirds as wide as long. Last 

 joint in femnle ovate, obtuse, not much 

 longer than the preceding : in male 



narrower, acute, nearly twice as long 

 as preceding. 



Head, tliorax, and abdomen bhick 

 throughout. Anterior legs yellowish 

 shaded with fuscous, except coxae and 

 distal joint of tarsi, which are black on 

 all the legs. Middle legs darker, hind 

 legs black, except tarsi and band at 

 upper end of tibia. Upper surface 

 of all the femora black. Wings extend- 

 ing far beyond the abdomen, hyaline, 

 iridescent. 



Total length of head and body .94 

 mm. ; fore wings .84 mm. long, .35 

 mm. wide. Head .35 mm. wide, .185 

 mm. long; thorax .36 mm. long, .29 

 mm. wide, and .30. mm. deep. Ab- 

 domen of female .46 mm. long, .30 

 mm. wide. 



This species differs from Platvgaster 

 herrickii (authentic specimens of 

 which Mr. L. O. Howard has kindly 

 sent me) chiefly in its mucii smaller 

 size, more shining aspect, — due to the 

 absence of the reticulate finish of the 

 surface characteristic of P. herrickii., 

 — by the shorter and more vaulted 

 thorax, by the corrugated, narrower, 

 and more convex vertex, and the 

 narrower temples, — the head having 

 a less cuboidal form, — but especially in 

 the parapsidal grooves, which in Pla- 

 tygastcr herrickii are very large and 

 distinct, and in P. hiemalis are barely 

 visible in the most favorable light. 



From P. miiifitus, very briefly de- 

 scribed bv Lindeman,^ it diflers in size, 

 and conspicuously so in the proportioi'.s 

 of tiie antennal segments, — Lindeman's 

 species l)eing only .5 mm. in length, 

 and the antennal scnpe about twice as 

 longasthe first joint of the flagellum. 



6 Lindeman, K. Die pteroinn lint n der hesscnflieg-e, 

 cecidomyia dentnictor Say. (Bull. Soc. imp^r. natur 

 Moscou, 18S7, no. I, i77-i'92.) Separate, p. 12. 



