30 E. T. CRESSON. 



cell without cross-nervure; spot on all the coxse, anterior knees and their 

 tibise before pale, anterior tibise with one side spur; narrow lateral margin of 

 abdomen above, and apical margin of ventral segments more or less, whitish. 

 Length .55 inch. 



Hab. — New York. This is allied to macuUventris Harris. 



Ii>'da albomarginata. — 9* — Black; head sparsely and coarsely punc- 

 tured ; two dots above insertion of anteunse, square spot on each side of face, 

 connected with a spot at summit of eyes, which is again connected by a narrow 

 line with occiput, two oblong spots back of ocelli, also connected with line on 

 occiput, cheeks, clypeus, scape beneath, lateral and posterior margins of pro- 

 thorax, subluuate spot on anterior middle of mesothorax, spot on each side 

 behind, most of pleura, spot over middle coxse, most of coxse and femora 

 beneath, lateral margin of dorsal abdominal segments, and band on apical 

 margin of ventral segments, all white; antennse very slender, about twenty- 

 nine-jointed, brown beneath, third joint about three times the length of the 

 fourth; thorax sparsely punctured, shining; wings hyaline, nervures and 

 stigma black, second branchial cell without cross-nervuro; tibise and tarsi 

 fulvous, anterior tibiae with one side spur; abdomen shining, apical middle of 

 segments above narrowly and obscurely pale. Length .45 inch. 



Hah. — Colorado, (Morrison). Closely allied to marginiventris, diflfer- 

 ing chiefly in the color of the legs. 



I^yda nigrita. — % . — Entirely black, shining ; head strongly, not closely, 

 punctured; antennse slender, about thirty-six-jointed, third joint about twice 

 the length of fourth; wings clear or slightly dusky, with an seneous reflection, 

 nervures black, second branchial cell without cross-nervure, third submarginal 

 cell rather shorter than the second; anterior tibife sometimes brown in front, 

 with one side spur, all the spurs pale. Length .50 inch. 

 Hah. — Nevada, (Morrison). 



E<yda atrata. — %. — Black, shining; head opaque, coarsely and conflu- 

 ently j)unctured; mandibles ferruginous; antennse about twenty-eight-jointed, 

 third joint about twice the length of fourth, flagellum brown at base; wings 

 varied or spotted with pale fuscous, especially towards apex, second branchial 

 cell without cross-nervure, third submarginal not longer than second; tibise 

 and tarsi fulvous, anterior tibise with one side spur. Length .36 inch. 



Hah. — Nevada, (Morrison). 



Lyda oclireipes. — 9- — Black; middle of clypeus, its anterior margin, 

 a slender line leading from summit of eyes to occiput, base of mandibles, palpi, 

 tegulse, spot before, scutellum, spot on postscutellum, legs and middle of venter, 

 pale lemon-yellow; antennse slender, about nineteen-jointed, third joint more 

 than twice the length of the fourth; wings slightly stained with yellowish, 

 nervures blackish, second branchial cell with incomplete cross-nervure, third 

 Bubmarginal cell larger, and a little longer than the second; coxse except tips 

 black, tarsi pale fulvous, anterior tibise without side spur; abdomen piceous. 

 Length .45 inch. 



Hah. — White Mountains, N. H., (Morrison). Allied to canadensis 

 Norton. 



