ICti — 



the micUUe portion smiiUer, more rcccciint;, ami ccaiLavc from the rpex of the V above. 

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

 spatulate, at least in the female. Antennre as in Chi-ys<,pila, except that the third 

 jo nt 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, I 

 count seven joints in the style, the last of which is elongated. Legs as in Chrysopila: 

 the hind tibiie with one, the middle til)ia; with two, rather weak spurs, the front tibise 

 with none. Wings large, the second vein sinuous as in species of Lepds, the anterior 

 branch of the third vein not sinuous, and without stump; the second posterior cell 

 narrow or petiolate at bnse, the anal cell open. 



This genus is the one referred to in my Classification {Eniovi. America- 

 na, I, p. 115) in the tabular s^vnopsis as "Nov. Gen." O. S. and con- 

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

 eric difterence from Ar/hropeas in the spur of the front tibioe was pointed 

 out by Baron Osten Sacken lour ye;irs ago, and, as he has not yet proposed 

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

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

 species of Leptidae will lor a moment doubt the family relationship, h 

 must unquestionably be placetl under the Leptidar, and not with the 

 Ccenomyidaj or Xylophagida.. 'J he addition, however, of the two gen- 

 era herein described, with G/ufups Burgess, furnishes most important ex- 

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

 limits very hard to deline. 



Arthroceras pollincGum, u. sp. 



llubUat. ~\\ As\\ingUm, Colorado! 



9- Leni;th, 5-5 to 7 mm. Face and hunt thickly light ochraceous pollinose. 

 .\niennic black, 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 pleurce beneath gray pollen, ochraceous above. Abdomen wholly and even- 

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

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

 dish. Legs yellow or lutescent yeilow, 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: \eins juteous yellowish, more fuscous toward the 

 outer part of the wing. 



(^. Face more grayish pollinose. Palpi black, and bushy jiilose. Abdomen in 

 ground 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. 



