138 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



yellow below; the row of yellow hairs on the lower inner edge of the 

 hind femora a little longer; there is no trace of the small knotlike 

 enlargement of the costa; the third vein is bent backward a little more 

 at tip; the bend in the last section of fourth vein is less and beyond this 

 bend the fourth vein is a little arched; the -wing is a very little wider 

 on its basal half; the lamellae of the hypopygium are also a very 

 little smaller. 



All these differences are rather small, but I can scarcely pass them 

 by without separating the two forms, therefore I propose the name 

 of gladius for the form wdth black fifth tarsal joints because of its 

 shorter third antennal joint, the name meaning a short sword. 



This is the form I have taken around Buffalo, New York ; the typical 

 form seems the most abundant in the New England States and also 

 seems more widely distributed, being found in the Eastern States, 

 Canada, North Dakota, and Oregon, while I have only seen this form 

 from the Eastern States, eastern Canada, and western New York, 

 but no doubt it will be found farther west. 



No. 91. DOLICHOPUS BREVIMANUS Loew. 



DoHchopus brevimanus Loew, Neue Beitr., vol. 8, 1861, p. 14; Mon. N. Amer. 

 Dipt., pt. 2, 1864, p. 39. — ^Melander and Brues, Biol. Bull., vol. 1, p. 148. 



Male. — Length 4 mm. ; of wing 3.75 mm. Face rather wide, a little 

 narrowed below, silvery white. Front shining green. Antennae 

 black; first joint yellow below; third rather large; somewhat oval 

 in outline, but pointed at tip. Lateral and inferior orbital cilia 

 whitish, a few of the upper cilia black. 



Thorax green, its dorsum shining, with a little white pollen along 

 the front; pleurae dulled with white pollen. Abdomen green with 

 narrow black incisures and with spots of white pollen on the sides 

 of the segments. Hypopygium black, its lamellae rather large, oval 

 in outline, whitish with narrow black border, j.agged and bristly at 

 apex, fringed above with black hairs. 



Fore coxae yellow with silvery pollen and very minute pale hairs 

 on their anterior surface and a few black ones at inner upper corner, 

 femora and tibiae yellow. Middle and hind femora each with one 

 preapical bristle, the latter with the black hair on upper edge becom- 

 ing long at base and with the little black hairs on their sides reaching 

 the lower edge on both inner and outer sides, so when they are viewed 

 from below there are two rows of little black hairs with a glabrous 

 stripe between them on the lower surface of the femora. Posterior 

 tibiae with their tips black for one-sixth their length. Fore tarsi a 

 little longer than their tibiae, yellow, a little infuscated at tip, first 

 joint about as long as second and third taken together, tlui-d to fifth 

 each a little shorter than the joint preceding it; middle tarsi about 

 one and a fourth times as long as their tibiae, black from the tip of 



