28 [January 



tinged with dusky ; nervures blackish, stigma brown. Legs fulvous 

 or bright yellow ; tbe four anterior coxae and a spot above at the base 

 of the posterior coxae, white ; posterior tarsi black, with a broad white 

 annulus near the tip ; tips of the other tarsi also black. Abdomen 

 stout, oblong-ovate, black, the apical margins of all the segments more 

 or less broadly white ; ovipositor piceous-black, as long as the abdomen, 

 valves black. Length 5f lines; expanse of wings 10 j lines. 



Collection. — Ent. Soc. Philad. Two specimens examined. 



Easily distinguished from the other species of this genus by the an- 

 nulated hind tarsi. 



Mesostenus lituratus. Brulle. 



Mesostenus lituratus, Brulle, Hym. p. 208. 

 Collection. — Ent. Soc. Philad. Two 9 > one £ > specimens. 



This species is distinguished by the metathorax having two white 

 spots at base, caused by having its basal margin black as well as a cen- 

 tral longitudinal and a central transverse line, thus dividing the dorsal 

 surface into four white spots, of which the basal ones are rounded and 

 the posterior ones elongate, covering the spines, which are long and 

 subacute; the second abdominal segment has also a white spot on each 

 side. 



Mesostenus zonatus. n. sp. 



Black; face, orbits, broad annulus on antennae, lines on mesothorax, most of 

 pleura and metathorax. scutellum, and bands on abdomen, white ; legs fulvous, 

 posterior tarsi white, black at base: wings hyaline; metathorax not spinose. 



Female. — Head black ; the face, orbits, very broad on the cheeks, 

 clypeus, mandibles and palpi, whitish ; antennae slender, as long as the 

 body, black, with a very broad white annulus beyond the middle, the 

 basal joint beneath also white. Thorax black ; mesothorax smooth, 

 with two dorsal, longitudinal lines, becoming confluent on the disk and 

 forming a large spot, white ; pectus and pleura whitish, the suture be- 

 tween them broadly black, and somewhat striated, the suture between 

 the pleura and metathorax, also black ; the scutellum, the carina on 

 each side anteriorly, tegulae, and the space immediately in front of the 

 metathorax, broad behind the wings, whitish ; metathorax whitish, the 

 base in front of the transverse carina; a longitudinal line on each side 

 extending posteriorly, curving outwardly at tip and ending in' a spot, 

 and a rather large, rounded spot just above the insertion of abdomen, 

 black, posterior face transversely aciculate. Wings hyaline, slightly 

 iridescent; nervures fuscous, stigma brown, with a pale spot at base. 

 Legs pale fulvous; the anterior coxse whitish, the posterior pair with a 

 black stripe exteriorly; posterior tarsi white, the basal third black. 



