AI.DKICII : DOI.ICIIOI'US AND HVGROCEI.KUTHUS. 1 7 



that the latter appears to have a white tip. Middle tarsi gently 

 infuscated from the tip of the first joint. Wings with a grayish tinge, 

 the fourth vein running rather far forward at its tip, costa not 

 thickened. 



Female. Fore tarsi gradually infuscated from the tip of the first joint, 

 one and one-third times as long as the tibiae; otherwise, after allow- 

 ing for the sexual characters, the same as the male. 



Length. 5 mm.; of wing 4.5 mm. 



One male, two females, Colorado (U. K.) 



Dolichopus marginatus, n. sp. 



Antennae red, third joint largely black or brown; cilia of inferior 

 orbit pale, of tegulac black; legs yellow, hind tarsi entirely black. 



Male. Face whitish, moderately narrow; front with a violet reflect- 

 ion; black hairs of first joint of antenna rather large and abundant. 

 Thorax dark green, shining; pleerae blackish-green, scarcely dusted. 

 Abdomen shining dark-green; hypopygium black, lamellaelarge. round- 

 ish, white, with a wide black margin, sharply defined; at the apex the 

 crooked branched bristles are as usual, but from this point on around 

 the upper edge, instead of the usual row of short and rather scattered 

 bristles, is a row of very long, strong, nearly straight ones. They are 

 black and curve gently toward the middle plane of the body. Near 

 the apex they arise from a series of prominences which become grad- 

 ually smaller. Fore coxae red with black hairs on the front side; 

 middle and hind coxae black, both, especially the latter, considerably 

 yellowish toward the tip. Femora and tibiae yellow; hind femora 

 ciliated below on the apical half with a row of long, black hairs (the 

 only instance I know in the genus where yellow femora have black 

 cilia). Hind tibiae slightly infuscated at the apex, with a dark line 

 on the inner side of the basal half, and the hind side wholly glabrous. 



Fore tarsi slightly longer than the tibiae, infuscated from tip of first, 

 blackened from the middle of the third joint; the fifth joint is as long 

 as the fourth and has a slight projection above the claws, yet could 

 scarcely be called flattened or enlarged. Middle tarsi gradually in- 

 fuscated from the tip of first joint; hind tarsi wholly black. Wings 

 rather broad and.short, with a slight grayish tinge; costa with a slight, 

 short thickening. 



Female. Fore tarsi as in the male; except the usual sexual charac- 

 ters, not differing from the male. 



Length, 5.5 — 6 mm. ; of wing 4.2 — 4.5 mm. 



Two males, eight females, Connecticut (U. K.). The color of the 

 legs is more reddish than usual. 



