272 [April 



punctate; extreme basal margins of the segments black; the second 

 except extreme apical margins, and base of third segments ferruginous, 

 the remainder bright yellow ; posterior margins sinuate, the basal seg- 

 ment with two central carinae ; beneath dusky, varied with yellowish. 

 Length 5 lines; expanse of wings 9 lines. 



One specimen. The colors of this lovely species are remarkably 

 bright and distinct. 



Genus BASSTJS. Grav. 

 1. Bassus orbitalis, n. sp. 



Black; inner orbits, clypeus, mandibles, palpi, sides of mesothorax, tegulse, 

 scutellums, anterior coxre, and broad annulus on posterior tibiss, white; wings 

 hyaline; legs pale rufous. 



Female. — Black ; inner orbits, ending in a confluent spot beneath 

 the eyes ; clypeus, mandibles and palpi, white ; clypeus depressed, the 

 basal margin prominent, the apex emarginate in the middle or bilobate; 

 antenna? about half the length of the body, entirely black. Thorax 

 closely punctured, the mesothorax shining; a broad line on each side 

 of the mesothorax, tegulas, a spot before and a Hue beneath, and a spot 

 on each side of the pleura just behind the anterior coxae, white; scu- 

 tellum with a broad white mark on its middle, dilated at tip; postscu- 

 tellum with a white transverse line ; metathorax dull black, rugose, 

 pubescent, the elevated lines tolerably well defined. Wings ample, 

 hyaline, beautifully iridescent; nervures and stigma blackish, the costa, 

 base of stigma and nervures at base of wings, yellowish. Legs pale 

 rufous, the anterior pair tinged with yellowish in front ; anterior coxae 

 and trochanters, white ; posterior tibiae and tarsi black, the former with 

 a broad white annulus about the middle. Abdomen black, depressed ; 

 the three basal segments densely punctured and opaque, with a deeply 

 impressed transverse line behind the middle ; apical segments polished, 

 and, except the fourth segment, impunctured ; first segment narrower 

 than the thorax, much depressed, with two well defined longitudinal 

 carina? at base; extreme base of second segment deeply incised and 

 crenulated. Length 3> lines; expanse of wings 6 lines. 



One specimen. 



1. Bassus maculifrons, n. sp. 



Black ; a spot on each side of face, a large spot on the middle, clypeus, man- 

 dibles, angular mark on each side of mesothorax, tegulae, scutellum, and spot 

 on each side of second and remaining abdominal segments, whitish ; legs pale 

 rufous; wings hyaline, iridescent. 



Female. — Black, shining ; a large quadrate spot on the middle of 

 the face, a spot on the lower orbits on each side of clypeus. the clypeus, 

 mandibles and palpi, yellowish-white; clypeus profoundly impressed on 



