158 ENTOMOLOGICAL NEWS. [May, 



the whole length beneath, yellow; anterior tibiae and tarsi yellow, middle 

 and hind tibiae at base and apex, and the hind tibise outwardly yellow; 

 middle and hind tarsi brown at base to sordid white at tips. Length 5.5 

 mm. 



Fort Collins, Colo., August. This species differs from vari- 

 coloratus as above described. With that species it differs from 

 robertsonii in having the last two segments of the abdomen ru- 

 fous, in having yellow bands on the abdomen back of the silvery 

 bands instead of reddish, in being otherwise much more highly 

 colored, especially on the legs, and in various structural charac- 

 ters as described. By the form of the spine and squamae, and 

 by the coloration, these three species form a very distinct and 

 conspicuous group. 



Oxybelns abdominalis n. sp. (^. — Head, mesonoturn and scutellum, 

 coarsely sparsely punctured, more thickly so on the occiput, and finer on 

 the face. Pronotum with a transverse carina, sides scarcely angled; 

 mesonotum with a median depression posteriorly; scutellum and post- 

 scutellum with indistinct median carinse, the former with lateral margins 

 membranous, the latter alike in structure and half the width of the 

 squamae ; squamae very large, hemispherical, separated behind, lateral 

 points minute and not exceeding tips of squamae; spine short, broad, 

 broader at tip, evenly rather deeply emarginate; metanotum above, lateral 

 faces and pleurae strongly punctato-striate; median area small, triangular, 

 having within three strong transverse carinae, passing below into a long 

 median carina. Abdomen broad oval, scarcely constricted between the 

 segments, not as coarsely punctured as the mesonotum, rather closely on 

 segments 1-2, more sparsely on 3-5; segments 3-6 with strong, broad, 

 blunt lateral spines; last two segments very coarsely punctured, the apical 

 long trapezoidal, truncate at tip. Color black; pubescence silvery, nor- 

 mal; mandibles yellow, with black tips; scape piceous, yellow at tip, fla- 

 gellum light brownish yellow; spot on either side of pronotum back of 

 carina, tubercles, tegulae, membranous margins of scutellum, squamae 

 and most of spine, whitish or somewhat yellowish white. Abdominal 

 segments 1-4 with apical margins broadly silvery, these bands narrowly 

 edged inwardly with yellow; segments 1-2, most of 5, and 6-7 bright 

 rufous. Legs black; fore and middle femora at tips, fore and middle 

 tibiae, and hind tibiae at base, yellow; fore tarsi yellow, middle and hind 

 tarsi more dusky. Length 3.75 mm. 



Fort Collins, Colo., on flowers of Solidago canadensis in Au- 

 gust. This species is very distinct from any described North 

 American form in the membranous margins of the scutellum and 

 coloration of the abdomen. It seems to be more nearly related 

 to mexicanus than to any other species. Although there is a 



