94 [August 



spots, and in one specimen entirely wanting, a transverse line on post- 

 scutellum, and the tegulae, pale-yellowish, sometimes almost white ; the 

 scutellum has a more or less deep channel down the middle, and in the 

 specimen with immaculate scutellum, the channel is very deep ; meta- 

 thorax sparsely punctured, with a deep, elongate, central fovea. Wings 

 hyaline ; nervures pale honey-yellow. Legs yellow ; the coxae, tro- 

 chanters, and the femora, except tips, black. Abdomen oblong-ovate, 

 sparsely punctured, shining; first segment convex, rounded in front 

 and contracted posteriorly ; second segment also slightly contracted at 

 base ; first segment with a median pale yellow baud, more or less deeply 

 emarginate on each side posteriorly, and occasionally interrupted in the 

 middle ; the remaining segments each with a pale yellow apical fascia, 

 that on the second segment broadest, deeply and squarely emarginated 

 on each side posteriorly; in one specimen this band is entire with a 

 minute black speck on each side of the middle ; the fasciae on third and 

 following segments are obtusely, sometimes squarely, emarginated on 

 each side anteriorly; apical segment immaculate, subtruncate or slightly 

 emarginate at tip ; beneath smooth, shining, immaculate. Length 4 

 lines ; expanse of wings 7 lines. 



Hab. — Rocky Mountains, Colorado Territory. (Ridings.) Coll. 

 Ent. Soc. Philad. 



Six % specimens; $ unknown. A beautiful little insect, closely re- 

 lated to the three following species in the markings of the abdomen. 



8. Philanthus politus, Say. 



Philanthus jiolitus, Say, Long's 2nd Exped. ii, p. 3t3; Amer. Ent. plate 49. 

 Anthophilus politus, Dahlb., Hym. Europ. i, p. 190. 



Black : face, line on collar, sometimes interrupted, two spots beneath the 

 wings, line on postseutellum, spot on each side of first segment of abdomen, and 

 emarginated bands on the remaining segments, white; tibiae yellow; wings 

 tinged with pale yellowish-fuscous. 



Female. — Black, polLshed, with deep scattered punctures ; vertex 

 slightly prominent, densely and very minutely sculptured; sides of the 

 face, suddenly narrowed on each side of the insertion of the antennae, 

 clypeus, a transverse spot between the antennae, and a dot above, be- 

 tween it and the ocelli, line on the mandibles, and a spot or line behind 

 the eyes, white; antennae black, thickened, the flagellum narrowed at 

 base, fulvous beneath, the scape white beneath. Thorax with scattered, 

 rather fine punctures; two transverse spots or an interrupted line on 

 collar, tubercles and a spot behind, line on postseutellum, and the teg- 

 ulse, white; metathorax with a deep fovea on the dorsal middle. Wings 

 stained with pale fulvo-fuscous, hyaline at base; nervures pale honey- 



