584 TBRTIAET INSECTS OF NORTH AMERICA. 



at the thorax. The male anteniifB consist of ten joints, and they are monil- 

 iforni, very gently and slightly decreasing in size to the tip, the apical joint 

 smallest, all together a little longer than the height of the head. Legs of 

 the male long and slender, all the femora of equal length (the middle pair 

 perhaps a little shorter than the others), slightly thickened, especially on the 

 apical half All the tibiae are very long, slender, equal, covered below Avith 

 a dense clothing of very deli cate and short hairs, and furnished above with 

 a row (!) of very short, delicate, minute, recumbent spines, the apex devoid 

 of spurs ; the first pair is about as long as the fore femora; the second is con- 

 siderably shorter than the middle femora, while the third pair is longer than 

 the hind femora. The tarsi are scarcely shorter than their respective tibife; 

 the first joint is nearly as long as the rest of the tarsus, excepting on the 

 middle legs, where it only equals the two succeeding joints taken together; 

 the remaining joints are subequal in length (on the middle legs the second 

 and third joints are longer than the fourth and fifth), and the last is armed 

 with a delicate pair of divergent claws. The whole body and the appendages 

 are black. The wings are fuliginous, deepening in tone toward the front 

 margin; they are nearly as long as the body and about three times as long 

 as broad. The first and second longitudinal veins are straight and approx- 

 imate to the front margin, the latter striking it scarcely beyond the middle 

 of the apical half of the wing, the former at about the middle of the third 

 quarter; the third longitudinal vein diverges from the second at some dis- 

 tance before the middle of the wing, is connected by the middle transverse 

 vein a little beyond the middle of the wing to the fourth longitudinal vein, 

 and forks either at a little more (c?) or at a little less (?) than one-third the 

 distance from the cross-vein to the apex of the wing,^ the lower branch 

 striking the tip, while the other, strongly curved, strikes the margin at 

 about one-third {s), or a little more than one-third (?), the distance from the 

 apex of the second to that of the lower branch of the third longitudinal 

 vein ; the fourth longitudinal vein is very nearly straight until it forks, con- 

 siderably (i?) or a little (?) nearer the middle transverse vein tlian the origin 

 of the fork of the vein above ; the branches part widely at base, the up])er 

 more arcuate than the lower; the fifth longitudinal vein forks as far from 

 the base of the wing as the divergence of the second and third longitudinal 



'The sexes in this genus differ in neuration, and, as tlie wing attached to the body of the male dif- 

 fers from tlie other wings in the particular above mentioned, I look upon the others as belonging to 

 females of the same species, and describe them accordingly. 



