June, 1913] AlDRICH : NORTH AMERICAN SpECIES OF LiSPA. 141 



stalk-like portion, with only a few hairs, which are on the lower edge and 

 the inner side. Thorax narrow, slightly brownish-black, not with noticeable 

 vittae ; hairs and bristles well developed, chsetotaxy normal ; pleura changing 

 color to a somewhat glaucous below; calypters white, with pale yellow border; 

 halteres yellowish ; wings of ordinary structure, the veins brownish toward 

 the base. ' Abdomen considerably flattened, oval in outline ; second, third and 

 fourth segments with successively larger white pollinose triangles on the sides, 

 middle of second and third segments with an indistinct yellowish pollinose 

 spot ; otherwise the abdomen becoming more shining black toward the tip ; 

 fifth segment black, showing very little from above ; bristles of abdomen not 

 very large. Legs wholly black except the first and second joints of the front 

 tarsus, which are more or less reddish, — the first short, with a process extend- 

 ing along the outer side of the second, nearly as long as the first and two 

 thirds as long as the second, the following joints of the front tarsus black 

 and somewhat flattened ; middle and hind femora moderately elongated and 

 slender, the latter with two or three slender bristles below beyond the middle ; 

 middle tibia with a small bristle on the hind side at the middle, hind tibia with 

 a bristle on outer side at the middle, 1.08 times as long as its tarsus. Length 

 6 mm. 



Female.- — -I am unable to indicate any satisfactory character on which to 

 separate the 5 from that of teiitaculata. 



Seven males : Boulder, Colo. ; Moscow, Kendrick, Peck, Juliaetta 

 and Potlatch, Idaho. Dates in Idaho are April i8, June ii, i8 and 

 28, and September lo. Two females collected at Boulder, which may 

 be this species (I got no males of feiitaciilata while collecting there), 

 have reddish middle and hind tibiae, comparatively small palpi, and 

 brown dust on the thorax. 



The type locality is Moscow. 



Lispa albitarsis Stein. 



Male. — Front narrow, especially below (head 3.85 times the width of the 

 front, the narrowest front in the genus) ; the visual acuminate frontal triangle 

 very indistinct ; sides of face very narrow, with a few hairs all the way up ; 

 whole face light brassy yellow; antennae black, third joint rather long, arista 

 brownish-yellow, loosely plumose ; second joint with indistinct brownish- 

 yellow band at apex ; vibrissse large and stout, on the outer side of each a 

 few coarse hairs curving downward ; cheek very narrow below the eye ; palpi 

 yellow, gradually expanded from the base, the widest part narrower than in 

 any other species found in North America, equal to about one third the length 

 of the third joint of the antenna. Thorax rather narrow, glaucous on the 

 anterior half with three brown stripes, which become indistinct on the more 

 shining portion behind the middle. Coxae and femora black, the front coxae 

 silvery in front, with few bristles ; front tibia black ; front tarsus elongated, 

 once and a third the length of the tibia (tibia is .74 the length of the tarsus) ; 



