34 E. T. CRESSON. 



segment above^ all white; anteniise slender at base, thickened beyond joint 

 five; wings stnoky-hyaline, second submarginal cell receives the first recur- 

 rent nervure at base, the second recurrent coinciding with the second trans- 

 verso-cubital nervure, lanceolate cell with straight cross-line; remainder of 

 tibiae, and all the tarsi fuscous; abdomen longer than head and thorax, 

 shining. Length .45 inch. 



Hab. — Colorado, (Morrison). 



XVEI^A Dalra. 



Xyela major. — 9- — Large, brown-ferruginous, opaque; head, just above 

 antennae, with a large purplish-brown spot, tinged at sides with green, all 

 beneath antennae yellowish-ferruginous; antennae ferruginous, about twelve- 

 jointed, the fourth and following joints very short and yellow; disk of meso- 

 thorax, pectus, and metathorax more or less brown; narrow posterior margins 

 of prothorax and of seutellum, and the tegulee, yellowish; wings yellowish, 

 with a golden gloss, nervures ferruginous, margined with pale fuscous, the 

 third marginal cell receiving two recurrent nervures, the second and third 

 submarginals each with one recurrent nervure, under wings with three inner 

 cells, two submarginal and one beneath; legs yellow-ferruginous, varied with 

 brown, base of tibiae and posterior tarsi yellow; abdomen shining, blackish- 

 brown above, with a greenish iridescence in certain lights, basal plates, first 

 segment, narrow apical margin of all the segments and small spot on each side, 

 most of the two apical segments, and venter ferruginous. Length to tip of 

 oviduct, .47 inch, expanse of wings 1.25 inch. 



%. — More slender, ferruginous; middle of face, all beneath antennae, cheeks 

 beneath, scape, spot on pleura, tegulse, tips of coxae, all the trochanters, four 

 anterior femora, base and extreme tips of posterior pair, basal half of four 

 anterior tibiae, basal third of posterior pair, posterior tarsi, and lateral margin 

 of abdomen, j'ellow; otherwise as in 9- Length .45 inch. 

 Hah. — Texas, (Belfrage). 



Fara. UROCERID^. 



XIPHYDRIA Latr. 



Xipliydria rufiveutris. — 9- — Black; head polished behind ocelli, 

 a short longitudinal pale spot on either side behind ocelli; face rugulose; 

 mandibles pale brown; thorax rugulose, the three longitudinal lines on meso- 

 thorax deeply impressed; tegulse pale; wings hyaline, iridescent, second re- 

 current nervure coinciding with the second transverso-cubital nervure, which 

 also coincides with the marginal cross-line; trochanters, base of tibiae and 

 tarsi pale, remainder of tibiae fuscous; abdomen ferruginous, shining, basal 

 plates fuscous. Length .40 inch. 



Hah. — New York, (Couistock). Allied to ahdomlnalis Say. 



UROCERUS Geoffr. 



Urocerus cteriileus. — 9.— Steel-blue; head and thorax clothed with 

 a fine black pubescence, coarsely punctured, sparsely so on cheeks, and pos- 

 terior part of head; pleura finely punctured; antennae black, twenty-one- 

 jointed; wings pale smoky, nervures fuscous, second branchial cell with in- 

 complete cross-uervure; legs steel-blue, tarsi sometimes brown towards tips; 



