94 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



mens distinctly interrupted), the posterior margin of the segment is 

 more broadly yellow; fifth segment with a triangular basal spot on each 

 side, and the posterior margin yellow. Legs yellow ; the hind femora 

 and tibine with a rather broad ring, and the hind tarsi brown. Wings 

 hyaline ; stigma light yellowish. 



A single specimen, from Professor Riley's collection, labelled " 269, 

 found under bark of cotton tree, Fla. Apr. 20, '74." Another specimen 

 was received from Mr. Eugene Keen, of Philadelphia, collected in 

 Pennsylvania; also three males and one female, collected by myself, 

 near the base of Mt. Washington, near evening, July 25. 



In a specimen irom the White Mountains, examined since the above 

 was written, I find the spots of the second segment distinctly separated 

 from the lateral margin. It might readily be confounded with s])eci- 

 mens of X.felix, but the species offers other distinct differences. In X 

 emarginata the last section of the fourth vein is longer and more oblique; 

 the first i)osterior cell broader ; the first pair of abdominal spots are 

 more broadly separated, and the two following bands more rounded on 

 their posterior angles ; the black of the abdomen is less shining, the 

 dorsum of the thorax more metalhc than in the two specimens of X. 

 felix known to me. 



Xanthogramma flavipes. 



Doros flavipes Loew, Centur., iv, 83. 



Hahitat. — Pennsylvania, Connecticut!, New York (O. S.) 

 (J , 2 . Length, 7 to 10>"™. Head pure light sulphur-yellow ; in the 

 female the front much narrowed above, with a slender black stripe 

 reaching from the black vertex to the base of the antenna^.. First joint 

 of antennae yellow ; second joint yellowish reddish ; third joint black- 

 ish, reddish toward the base below, rounded, larger in the female. In 

 the male an inverted V-shaped ridge above the antennae, with a small 

 black dot in the apex. Face considerably receding, with a i^rominent 

 tubercle below the middle; pile yellow, on the posterior orbits white. 

 Thorax shining greenish black, the lateral strij>es entire, bright yellow, 

 8hari)ly distinguished; on the pleurae, a middle stripe, reaching on the 

 sterno-pleura, a spot above the anterior coxa), and the sides of the meta- 

 notum, yellow. Scutellum lightyellowaloug its margin, black at the base. 

 Abdomen velvety black. In the male the first segment shining: second 

 segment with a broadly interrujited yellow fascia near the front part; 

 third segment with the broadest fascia entire, on the front part, emar- 

 ginate behind; fourth segment similar, and also on the hind border 

 narrowly yellow, not reaching the sides, but forming with the anterior 

 angles of the fifth segment a strongly arcuated band, the latter seg- 

 ment yellow behind ; hyi^opygium blackish ; third segment across the 

 middle with a narrow shining fascia, which in some specimens may be 

 reddish ; fourth segment with a broader shining cross-band ; fifth wholly 

 so. In the female the first three cross-bands are narrower than in the 

 male, of an even width, not interrupted nor emarginate, the shining 



