1893.] NATURAL SCIENCES OF PHILADELPHIA. 491 



side of the medial furrow, which is very strong ; vertex with very 

 fine and close punctures ; space between the eyes at top distinctly less 

 than the length of antennal joints 2 and 3; antennae tolerably long 

 and setaceous ; first joint of flagellum, if anything, a little longer 

 than the second ; dorsulum with fine, even, compact punctures; 

 scutellum much more finely and sparsely punctured than the dorsu- 

 lum, its apical portion impressed ; metathorax striated, most strongly 

 on posterior face the upper surface with the striations irregular; legs 

 strongly spinose ; pygidial area in length, when fully exposed, about 

 twice greater than its width at the base, strongly and sparsely punc- 

 tured. Black ; abdomen, except last three segments, bright red ; 

 tarsi testaceous ; wings subfuscous, iridescent nervures black ; margi- 

 nal cell on apical portion separated for about one-fifth its length 

 from the anterior margin of the wing, being therefore more or less 

 pointed at apex ; recurrent nervures with the distance between them 

 at the top less than that between the first recurrent nervure and the 

 base of the second submarginal cell. Length 16-17 mm. 

 Colorado and Nevada. 



3. — Ancistromma distincta Sin. 

 Larrada distincta Sm., 1. c. p. 292. 

 La// a distincta Patt., 1. C. p. XX, p. 390. £ $ . 



9 . — Anterior margin of clypeus emarginate medially, bidentate 

 laterally, the lateral angles not strongly produced; front very finely 

 and closely punctured, the medial furrow distinct but not strong ; 

 vertex with the punctures finer and closer than those on the front; 

 space between eyes at top a little less than the length of antennal 

 joints 2 and 3 united; antenna 1 shorter than the head -and thorax 

 united, the first joint of the flagellum about one-third shorter than 

 the second; dorsulum with fine, even, distinct puuctures; scutellum 

 punctured likewise, not impressed ; metathorax striated, most coarsely 

 soon posterior face, the striations on upper surface irregular, i. e., on 

 basal portion they are longitudinal until they reach a little beyond 

 the middle, where they curve and extend to the sides, on the poster- 

 ior portion of upper surface the striations are transverse, the upper 

 face has a strong furrow ; legs tolerably strongly spinose ; pygidial 

 area strongly and sparsely punctured, about two and a quarter times 

 longer than it is broad at the base. Black ; tarsi testaceous; wings 

 hvaline, slightly dusky at apex, iridescent ; marginal cell obliquely 

 truncate. Length 11-13 mm. 



