282 J. M. ALDRICH. 



Psilopodinns pilicornis sp. uov. 



i¥((/e. — Wholly green and black, no yellow whatever, wings with two crossbands. 

 Face dark green, but little dusted ; antennsB black, second joint with about 12 

 stout bristles, which are longer than the antenna itself; palpi also with quite 

 noticeable black hairs ; front dark green, with slender pale hairs on the sides, some 

 of which have a brownish cast. Thorax dark green, pleurie but little dusted ; hal- 

 teres and tegulse black. Abdomen brighter green, a black band on the anterior 

 edge of each segment; these bands are wider on the apical segments, and on the 

 last two cover half or more of the width; hypopygiuni small, black. Legs black, 

 the femora greenish ; fore tarsi much longer than the tibise, first joint longer than 

 all the rest, with a row of small hairs on the under side and some small bristles on 

 the outer side near the end, also a small enlargement below at the tip; second 

 and third joints short, equal, enlarged below; fourth and fifth longer, equal. 

 Metatarsus of middle foot as long as the tibia, on the upper side a row of ex- 

 tremely fine erect cilia, especially distinguishable at the base. Wings with a 

 spot in the first basal, and the usual two crossbands brown ; the bands are rather 

 small, but in mature specimens distinct; in many teneral specimens they are 

 faint. 



The hairs on the incisures of the abdomen are longer and more erect than in 

 most of the genus. 



Female. — Halteres with yellow knob, few and short bristles on the antenna and 

 abdomen, black bands of abdomen almost wholly absent. 



Length 4-5 mm. 



Many specimens : Lewiston, Idaho ; Craig's Mt., Idaho ; Seattle 

 and Colfax, Wash. ; Cal. (Coquillett and Baron, specimens collected 

 by the latter being received by me from the Univ. of Kans.). 



The common western species, differing from melampvs chiefly in 

 the short joints in the male fore tarsi. 



PsilopodinuN gracilis sp. nov. 



Male. — Face blue-green, but little dusted ; antennae small, black, the second 

 joint with few hairs, longest above; vertex deeply excavated, with few small 

 hairs. Thorax bright green, rounded, the sides with a light greenish gray dust, 

 in certain lights much more white. Halteres yellow, stem whitish. Abdomen 

 unusually slender, with broad black bands; the metallic parts of the last two 

 segments are violet; on the last four segments more than half is black (but this 

 is in only one specimen) ; hypopygium minute, black, with four finger-like pro- 

 jections, blackened at tip. Coxie and femora black, the fore and middle trochan- 

 ters yellow, and the fore coxae themselves rather brown than black ; tibise yellow, 

 the tarsi all gently in fusca ted from the base. Fore femora shorter than the tibise, 

 the tarsi fully double the length of the tibise, slender and apparently free from 

 hairs of any size ; the fore tibiae have on the outer side some three or four small 

 bristles; middle tibiae longer, with about the same bristles, their tarsi once and a 

 half their length, .slender, plain ; hind tibiae yellow, but infuscated at base and 

 tip, hairy, especially on the inner side ; the tarsi black towards the end, the last 

 three joints are slightly flattened, short, a little concave below. Wings with very 

 broad crossbands, which include more than the apical half of the area, and en- 

 tirely reach the hind margin at the apex of the fifth vein; they are connected on 

 the fourth vein, so as to enclose a large, rather square hyaline spot in the 1st pos- 

 terior cell ; the anterior fork of the fourth vein runs toward the base of the wing 

 for a distance, then makes a short but rounded turn and runs to the tip. 



