190 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



individuals before mentioned with Van der Wulp's specimen 

 deposited in the British Museum, and am greatly indebted to 

 Mr. John E. Collin of Sussex Lodge, New Market, England for 

 this service. Mr. Collin's report makes it abundantly evident 

 that the specimens are conspecific. 



The following description and accompanying figures will I 

 trust render the identification of this form more easy hereafter. 



Male. Palpi normal, first vein bare, face on Lower half of sides bare, 

 proboscis shorter than height of head, apical cell not petiolate ending in 

 costa well before the wing tip. Eyes bare, facial ridges bristly on lowest 

 third, antennae inserted at middle of eyes, hind tibiae outwardly dis- 

 tinctly ciliate, ocellar bristles absent, all frontal bristles curving more or 

 less backward, the last two pairs very stout; palpi slightly spatulate. 

 Front, in lateral elevation, distinctly produced in a gentle curve almost 

 parallel with anterior margin of eye, cheeks extremely narrow, abdomen 

 short, conical, wings rather broad and short. Body robust, gray and 

 black, head (figs. 1 and 2) broader than thorax, wings hyaline. Length 

 6 mm. Front less than one-half eye width covered with pollen which has 

 the property of appearing bright silvery from above and dull smoky gray 

 when viewed from immediately in front or from side. Vitta, black, nar- 

 row, almost linear. Vertex brown. Superior posterior orbit and occiput 

 linear. The inferior posterior orbit expanded and silvery pollinose. 

 Lower'occiput slightly swollen and bearing abundant black hairs. Sides 

 of face narrow, concolorous with front. Facial depression large, rather 

 deep, and slightly carinate, vibrissae at oral margin, well developed, 

 cruciate. Cheeks linear, covered with black hairs and bearing a row of 

 macrochaetae on their lower edges. Orbital bristles absent. Antennae 

 black, third joint a little more than twice as long as second. Arista slender, 

 second joint short, third slightly enlarged on basal fourth; microscopically 

 pubescent nearly to middle. Thorax black, shining, only lightly grayish 

 pollinose on anterior portions; two pairs of vittae visible anteriorly, 

 becoming obsolete posterior to suture. Scutellum concolorous with thorax, 

 bearing three marginal and a small apical pair. Dorso-central bristles 

 four; sternopleural two, the latter region clothed with abundant black 

 hair. Abdomen corfical, black, shining, bases of the last three segments 

 bearing whitish pollen, traces of a median black vitta apparent on inter- 

 mediate segments when viewed from rear. Four segments visible from 

 above, all rather thickly clothed with longish, nearly erect, black hairs. 

 First two segments bearing marginals only. Third with a strong marginal 

 row. Fourth bearing both discals and marginals. Legs, including coxae 

 black, robust, hind tibiae thickly ciliate on outer sides. Middle tibiae 

 bearing one or two macrochaetae upon thin outer front third. Wings 

 hyaline, veins brownish, apical cell broadly open in costa, bend of fourth 

 vein destitute of stump or wrinkle, distinctly angulated. Hind cross vein 

 ending slightly beyond middle of discnl crh, Insinuate. Third vein boar- 

 ing three or four small bristles at base. 



