82 BULLETlISr 116, UNITED STATES NATIONAL, MUSEUM. 



19; 2 males were taken at Boston, New York, July 10; and 2 males 

 and 1 female were taken at East Aurora, August 3. 



This seems to be the same species as stood in the Loew collection 

 at Cambridge, under the MS. name of stenoprosopus . I could not 

 find this specimen when looking over the collection in 1919, but 

 Professor Aldrich saw it when looking over the Loew types in 1901. 



Type.— Male, Cat. No. 22999, U.S.N.M. 



No. 42. DOLICHOPUS LITORALIS, new species. 



Male. — Length 4 mm,; of wing 3.5 mm. Face moderately wide, 

 a little narrow below, silvery white. Front dark green. Antennae 

 wholly black; third joint but little longer than wide, oval in out- 

 line. Lateral and inferior orbital cilia whitish, a few of the upper 

 cilia black. 



Thorax dark green with coppery reflections, especially at the 

 suture; pleurae dulled with gray pollen. Abdomen green with 

 slight coppery reflections. Hypopygium black; its lamellae (fig. 42) 

 moderately large, somewhat quadrilateral in outline, whitish with 

 a narrow black border on apical and upper margins, jagged and 

 bristly on apical margin, fringed on upper edge with brown hairs. 



Coxae and femora black, extreme tips of coxae, trochanters and 

 extreme base and tips of femora yellowish. Fore coxae with minute 

 black hairs on the anterior surface. Fore and middle femora each 

 with one preapical bristle, the latter ciliated below with long white 

 hairs on lower apical fourth, these hairs nearly as long as the width 

 of the femora; the fore and middle femora also have a row of short 

 but conspicuous white hau's on lower posterior edge. Tibiae yellow; 

 posterior pair a little stouter than the others, their tips black for 

 fully one-fourth their length; middle and hind tibiae each with one 

 bristle below near apical fourth. Fore tarsi about one and a fourth 

 times as long as their tibiae, first joint scarcely as long as the three 

 succeeding joints taken together, third, fourth and fifth joints of 

 nearly equal length, second only a little longer than third, each 

 joint, beginning with the second, narrowed a little at base, so as to 

 give the tarsi a serrate appearance. Middle tarsi one and a third 

 times as long as their tibiae, black from the tip of the first joint, 

 their basitarsi without a bristle above. Hind tarsi wholly black. 

 Calypters, their cilia and the halteres yellow. 



Wings (fig. 42a) grayish, a very little tinged with brown in front 

 of third vein; costa scarcely enlarged at tip of first vein; last section 

 of fourth vein a little bent before its middle; third vein bent back- 

 ward a little so as to approach the fourth at tip; hind margin of 

 wing scarcely indented at tip of fifth vein ; anal angle rather promi- 

 nent, still the wing of somewhat equal width, a little narrowed at 

 base. 



