58 THE CANADIAN ENTOMOLOGIST. 



fuscous annulated with luteous, especially before the tip, which is clavate ; 

 shorter, more clavate in female ; the two basal joints brown, shining ; 

 vertex elevated, rounded, yellowish with two blackish dots ; prothorax 

 little longer than broad, yellowish, with two dorsal black lines, ending on 

 the anterior transversal sulcus ; sometimes a darker spot in front of the 

 lines ; on each side and nearly below a black band connected with the 

 lateral one of the thorax ; two black maculose bands including yellow 

 spots on the thorax ; mesothorax before wings black, with yellow spots ; 

 abdomen of male much longer than wings, faintly villous yellow, with a 

 fine black median line, apical part blackish, yellow on articulation and 

 some lateral marks ; appendages less than half the length of last seg- 

 ment, cylindrical, yellowish, brown at base, densely clothed with black 

 hairs ; below and between them a small triangular yellow plate ; abdomen 

 of female as long as wings ; coloration similar, but the dorsal yellow band 

 divided by a black line reaches the apex ; genital parts yellow, the superior 

 part split, with many black spines ; below two short yellow appendages. 

 Wings hyaline with a faint yellowish tint ; veins pale interrupted with 

 brown, which covers in front wings most of base of the small forks and 

 the base and apex of the transversals ; therefore the wing is faintly 

 sprinkled, more densely along the mediana and submediana ; hind wing 

 similar but less and more faintly sprinkled ; pterostigma white, larger in 

 the female ; wing around and on the venation faintly villous ; apical half 

 of costal space with forked veins. Legs short, pale, sprinkled with 

 black, with black hairs ; tip of tibiae and of joints of tarsi black, fourth 

 joint entirely black ; spurs as long as three basal joints, or at least longer 

 than two, brown. Length of body, male, 30 to 37 m.m.; female, 28 to 

 30 m.m. Exp. ah, 36 to 54 m.m. 



Habit., New Jersey, Uhler ; Pennsylvania; Georgia, Morrison ; Wash- 

 ington, O. Sacken ; Rock Island, 111., Walsh ; Utah, Lake City, O. Sacken, 

 August 1, and Packard, August 13 ; Colorado, Golden City, Boulder, July 

 3, Packard ; Texas, Dallas, Boll ; Waco, Belfrage, June, July, Sept., Oct.; 

 San Antonio, A. Agassiz ; Carrizo Spring ; New Mexico, Zuni, Hayden's 

 Exped., July ; Umatilla, Washington Territory, S. Henshaw, June 28 ; 

 California, Vulcane Mts., Stinking River, H. Edwards. 



The size of the specimens is rather variable in the same locality ; 

 there are before me now more than 50 of both sexes, but I have seen 

 more. The species seems very common in Texas, Colorado and New 

 Mexico. 



