10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



cnted at tip, not ciliated, but with unusually long black hairs on outer 

 lower part beyond midde, with a single long preapical bristle. Front 

 and middle tibiae yellow, the hind ones infuscated on about the apical 

 fourth but not much enlarged; front tibia at apex below with a 

 long slender bristle two-thirds as long as the basitarsus. All the tarsi 

 plain, the front and middle ones infuscated from the tip of the first 

 joint; hind ones entirely black. 



AVings hyaline, rather narrow, the angle much reduced ; the fourth 

 vein with only a slight bend, ending much before the apex of the wing. 

 Costa with a large and long thickening at the junction of the first 

 vein. 



Female. — Face considerably wider than in the male, almost white. 

 Front coaxae with black hairs on the anterior surface. Hind femora 

 with faint infuscation covering about the apical fourth. 



Length 3.2 mm. 



Described from 3 males and 2 females. All collected by the writer 

 at Camp 327, Alaska, July 12, 1921. 



Type.—M2lQ, Cat. No. 25190, U.S.N.M. 



ySimpUcipes runs in the tables of Bulletin 116 to couplet 10, page 

 17. It differs from discolor in having the costa thickened, and from 

 genuaJAs in not having the lamella produced in a sharp point at apex. 



DOLICHOPUS CRASSICORNIS, new species. 



Male. — Front bright green. Face light golden yellow, rather 

 narrow below\ Palpi yellow. Antennae wholly black, quite large, 

 the third joint considerabl}' elongated, about twice as long as wide; 

 the arista inserted near the tip. Orbital cilia pale yellow except 

 a few above. 



Mesonotum bright green with a brown mark each side. Scutellum 

 green. Pleurae green, subshining. Cilia of the calypters black. 

 Halteres yellow. Abdomen bright green, at incisures narrowly 

 blackish. Hypopygium black. Lamellae white, oval or somewhat 

 rectangular, with a black border above which is wider apically, 

 where there are the usual incisions and curved bristles. 



Coxae black, the front ones slightly yellow toward the apex, es- 

 pecially on the front side. Femora yellow, front ones faintly tinged 

 with brown below, the hind ones without cilia, and with a slight 

 but distinct infuscation at the tip above. Tibiae yellow, the hind 

 ones deep black on the apical third or more, slightly enlarged 

 apically and bearing on the hind side just before the apex a very 

 striking, rounded depression; the flexor side of the hind tibiae 

 closely beset with small black suberect hairs. Hind tarsi entirely 

 black; front and middle tarsi plain, black from tip of the first joint. 

 The front tibia has at apex a fine curved hair-like bristle which is 

 quite short, less than half the length of the basitarsus. 



