430 



PSYCHE. 



[April 1S93. 



margin. Sides of face extremely narrow, 

 cheeks but little wider, the eyes thus descend- 

 ing very nearly to oral margin. Oral mar- 

 gin distinctly protruded anteriorly, vibrissal 

 angles situated distinctly above oral margin, 

 facial ridges with only several small bristles 

 above and immediately next to the vibrissae, 

 which latter are not strong but are distinct 

 from the row of other bristles below them, 

 and slightly decussate. Antennae reaching 

 a little more than half-way to the oral mar- 

 gin, third joint about once and a half as long 

 as second. Arista bare, thickened on basal 

 third, i-jointed at extreme base. Frontal 

 bristles rather weak, descending only to in- 

 sertion of antennae. Proboscis not long, 

 moderately stout, labella developed; palpi 

 filiform, very slender but elongate. Thorax 

 distinctly narrower than head, with a few 

 bristles; scutellum subtriangular, with three 

 pairs of bristles. Abdomen broad round- 

 ovate, very distinctly wider than thorax, less 

 broadened in $, vaulted, the tergum convex, 

 venter almost always concave, furnished with 

 rather numerous weak macrochaetae. Legs 

 not stout, moderately long. Wings longer 

 than abdomen, apical cell long petiolate, the 

 petiole but little shorter than apical cross 

 vein, fourth vein bent in a curve to third 

 hardly more abruptly than in Hyalomyia. 

 Hind cross vein nearly straight, longer than 

 apical cross vein, nearer to small cross vein 

 than to curve of fourth vein. Tegulae large, 

 the upper scale about one fifth size of lower. 

 Hyalomyodes weedii nov. sp. Length of 

 body, 4 to 4.5 mm.; of wing, 3.5 to 4 mm. 

 Frontal vitta velvety black, taking up nearly 

 all of front, widening behind and before with 

 the width of front; the extremely narrowed 

 sides of front, the sides of face and cheeks 

 silvery white; facial depression silvery. 

 Antennae and arista black, palpi fulvous. 

 Thorax soft deep black, with a golden brown 



shade in oblique lights, humeri and pleurae 

 cream colored, or silvery with a slight golden 

 shade. Scutellum wholly black. Abdomen 

 black, second segment with a median vitta 

 and a narrow anterior border silvery pollinose 

 with a slight golden shade, the border widen- 

 ing laterally; third segment same, but with 

 the pollinose border more widened and later- 

 ally reaching the posterior border of segment, 

 thus leaving on the posterior half of the seg- 

 ment an irregular black area on each side ot 

 the pollinose median vitta; anal segment 

 entirely pollinose. First segment with a 

 median marginal pair of bristles, second with 

 a median marginal and discal pair, third and 

 anal segments each with a somewhat irregular 

 discal and marginal row of weak macro- 

 chaetae. Legs black; claws and pulvilli 

 short in $ , a little elongate in $. Wings 

 hyaline, slightly grayish; tegulae tawny 

 yellowish, halteres pale fulvous. 



There seems to be little difference 

 between the sexes, the $ having the 

 claws a little elongate while there is no 

 appreciable difference in width of front. 

 Described from three specimens, 2 9 

 and 1 $ , Hanover, N. H., from Dr. C. 

 M. Weed ; and 2 $ , Franconia, N. H., 

 from Mrs. A. T. Slosson. I have seen 

 this peculiar fly as yet only from New 

 Hampshire. 



Note. — Since sending the above in for 

 publication, I have found in a sending from 

 Mr. C. W. Johnson, of Philadelphia, two 

 more specimens of this fly. One of these is 

 a $, from Franconia, N. H., collected by 

 Mrs. Slosson. The other specimen is from 

 Montgomery County, Pennsylvania, and was 

 collected July 17. 



