— I 



the middle portion smaller, more recedhij av< from the a] ex oi the V above. 



The eyes in the male- are broadly contiguous; the palpi are ported, and somewhat 

 spatulate, at least in the female. Antenna' as in Chrysopila, except that the third 

 jo ni is not at all dilated, and the arista is replaced, by a thickened, elongate, distinctly 

 jointed style, a little broader toward the base, where it tapers from the joint. 1 

 i omit -even joints in the style, the hist of which is elongated. Legs as in Ohrysopila; 

 the hind tihi.e with one, the middle tibia.- with two, rather weak spurs, the front til ise 

 . me. Wings large, the second vein sinuous as in species of Lijili.s. the anterior 

 branch of the third vein not sinuous, and without stump; the second poster i 

 nanow or petiolate at base, the anal cell open. 



This genus is the one referred torn my Classification {Entom. America- 

 na, 1. p. 115) in the tabular synopsis as "Nov. Gen." O. S. and con- 

 tains, beside the following new species, Arthropeai leptis O. S. The gen- 

 i ri< difference from Arihrbpeas in the spur of the front tibiae was pointed 

 out by Baron Osten Sack en four wars age, and, as he has not yet proposed 

 a name for the genus, 1 venture to do so in order to describe the following 

 interesting species. No one who will compare the present with other 

 species ofLeptidse will for a moment doubt the family relationship. It 

 must unquestionably be placed under the Leptidse, and not with the 

 Ccenomyidae or Xylophagida?. 'Ihe addition, however, ol the two gen- 

 era herein described, with Glutops Burgess, furnishes most important ex- 

 ceptions to the distinctive characters of the family, and will make the 

 limits very hard to define. 



Arlhroceras polhnosum, n. ^p. 



Habitat. Washington, Colo 



O. Length, 5.5 to 7 mm. Face and front thickly light ochraceous pollinose. 

 Antennae Mack, the third joint at base, and the tip of second, reddish or yellowish. 

 Palpi reddish yellow, the tip black. Thorax in ground color black, but the dorsum 

 and the scutellum concealed beneath dense, nearly uniform ochraceous yellow pollen, 

 and the pleura: beneath gray pollen, ochraceous above. Abdomen wholly and even- 

 ly covered beneath with light grayish yellowish pollen, in the ground color black, at 

 the hind margins of the segments, more broadly behind, apparently yellowish or red 

 dish, begs yellow or lutescent yellow, the last four joints on all the tarsi brownish. 

 Wings distinctly tinged with brownish yellow, the costal cell and outer part of margin- 

 al cell of a more saturate color; veins futeous yellowish, more fuscous toward the 

 outer part of the wing. 



$. Face more grayish pollinose. Palpi black, and bushy pilose. Abdomen in 

 -round color wholly black, the hypopygium at tip, only yellowish. Femora, except 

 the tip, black, the tarsi, except the base, darker; the light colored pile of the legs lon- 

 ger and more abundant. 



