1864.] 147 



the length of the body, black. Thorax black, shining, closely punc- 

 tured ; a spot on tegulas, a spot before and a line beneath the wings 

 white ; scutellum rather flat, smooth and shining, black with a rather 

 large, cordate, white spot ; metathorax black, subopaque, the elevated 

 lines well defined, the central area transverse, subreniform, being- 

 rounded in front and emarginate behind. Wings subhyaline, apical 

 margins slightly fuliginous, nervures and stigma black, areolet 5-angu- 

 lar. Legs black, tips of the four anterior femora and their tibise and 

 tarsi exteriorly, white, the tips of the latter and the claws, black ; in- 

 ner half of the posterior tibise also white. Abdomen elongate, black 

 with a slight tinge of blue, somewhat shining, rather smooth, the punc- 

 tures close, but distinct and uniform, becoming less obvious towards 

 the tip ; first segment bilineated, shining, the peduncle slender ; basal 

 foveas of the second segment obliquely impressed ; beneath black. 

 Length 6 lines ; expanse of wings 10 lines. 

 Hah. — Rocky Mountains, Colorado Territory. 



21. Ich. obliteratus, n. sp. 



Black; scutellum white; wings subhyaline, areolet incomplete; central area 

 of metathorax obliterated. 



Male. — Jet-black, subopaque, densely punctured ; a minute whitish 

 spot at the summit of the eyes ; antennte about half the length of the 

 body, entirely black. Thorax shining above, conflueutly punctured ; 

 a spot on tegulae, a short line before and a line beneath the wings, 

 white; scutellum rather convex, deeply impressed in front, with a 

 large quadrate white spot; metathorax opaque, scabrous, the elevated 

 lines indistinct, the central area obliterated. Wings subhyaline, apical 

 margins smoky ; areolet subtriangular, incomplete, the outer nervure 

 being almost entirely obliterated. Legs black ; tips of the anterior and 

 intermediate femora, the anterior tibiae and tarsi, the intermediate 

 tibiae and tarsi exteriorly, and the posterior tibiae at base, white. Abdo- 

 men elongate, rather slender : basal segment, broad posteriorly, biline- 

 ated and roughly punctured ; basal foveas of the second segment small 

 and indistinct ; the second and third segments above densely punc- 

 tured, the apical ones smoother and shining, especially the sixth and 

 seventh; beneath black, shining. Length 6^ lines ; expanse of wings 

 11 lines. 



Hah. — llocky Mountains, Colorado Territory. 



