102 [August 



entirely except a black dot on the apical middle, and an oblique line 

 or dot behind the eyes, all white ; the antennae are lon-zer and more 

 slender, especially so at base, entirely black except a whitish spot on 

 the second, third and fourth joints of the flaaellum beneath ; the wing-s 

 are much clearer, being only slightly dusky at tips; the femora are 

 entirely black except the tips, which are whitish ; the markings of the 

 abdomen are much the same, except that the narrow yellow or whitish 

 fasciae on the apical margins of the third and three following segments 

 are more or less wavy, the apical segment is black, and subtruncate at 

 tip ; beneath black, slightly pubescent, with a white dot on the extreme 

 sides of the second and following segments. Length 5^ — Qh lines; 

 expanse of wings 9i — 10 i lines. 



Hah. — Rocky Mountains, Colorado Territory. (Ridings.) Coll. Ent. 

 Soc. Philad. 



Five 9 , two % specimens. A very handsome and distinct species. 



16. Philantlius flavifrons, n. sp. 



Black ; face, mandibles, base of antennse, posterior orbits, collar, tegulfse. two 

 spots beneath the wings, postscutellum, two spots on metathorax, most of legs, 

 and broad bands on abdomen, the two first interrupted, yellow; wings duskv. 

 Female. — Black, shining; head without distinct punctures; the face, 

 extending a little above the antennjB, both in the middle and sides, 

 clypeus, mandibles except tips, a long continuous line on the cheeks, 

 extending on to the occiput, and two small oblique lines behind the 

 ocelli, bright yellow ; antennae black above, fulvous beneath, except 

 the three basal joints which are yellow. Thorax polished, with fine 

 sparse punctures, very sparse on mesothorax, which has a rather deep 

 dorsal channel and a fliintly impressed longitudinal line on each side 

 over the tegulae; collar, tubercles and a transverse spot behind, a large 

 triangular mark on each side of the pleura, tegulae, an oblique spot at 

 each basal corner of the scutellum, a line on the postscutellum, and a 

 large rounded spot on each side of the metathorax posteriorly, bright 

 yellow; scutellum longitudinally impressed on the middle; metathorax 

 very closely and rather finely punctured, slightly pubesceat, with an 

 elongate rather deep fovea on the disk. Wings tinged with yellowish, 

 dusky at tips; nervures dull honey-yellow. Legs yellow; the coxa;, 

 trochanters, and base of femora more or less, black, the former with a 

 white spot beneath ; tips of the tarsi a little dusky. Abdomen ovate, 

 slightly strangulated at base, the second and third segments deeply in- 

 cised at base ; the three or four basal segments with very deep, large, 

 coarse punctures, becoming smaller towards the tip; first and second 

 segments each with a large transverse bright yellow spot on each side. 



