288 [April 



pale yellowish-white. Wings whitish-hyaline, iridescent, stigma large, 

 blackish, the nervures subhyaline. Legs pale ferruginous ; anterior 

 coxse, annulus on four posterior tibiae and their tarsi at base, whitish ; 

 remainder of the posterior legs, blackish. Abdomen slender at base, 

 broad and compressed beyond the first segment, black, shining, feebly 

 punctured; first segment swollen at tip, the second covered with very 

 fine longitudinal strife; apical margins of the remaining segments pale 

 yellowish, dilated into a large spot on the dorsal edge; venter pale yel- 

 lowish, spotted with blackish; ovipositor longer than the abdomen, 

 piceous. Length 4 lines ; expanse of wings 5 lines. 

 Two specimens. 



Genus XYLONOMUS, Grav. 

 Xylonomus cincticoruis, n. sp. 



Black: antennae with a broad white annulus beyond the middle: wings sub- 

 hyaline: tarsi brownish: ovipositor longer than the body. 



Female. — Deep black, subopaque; head minutely sculptured, the 

 cheeks indistinctly aciculate ; clypeus small, transverse-ovate, deeply 

 concave, piceous, as well as the palpi ; antennas more than half the 

 length of the body, slender, black, with a broad, pure white annulus 

 just beyond the middle.. Thorax : mesothorax very closely punctured, 

 rugose on the disk posteriorly, the middle lobe prominent; prothorax 

 and pleura sparsely and delicately punctured, polished, clothed beneath 

 with a very fine, short, silvery-white pile; scutellum flatly elevated, 

 closely and minutely punctured, shining, with a deep transverse exca- 

 vation in front; metathorax rugose, with well-defined elevated lines, 

 forming a broad, elongate central area, constricted into a narrow neck 

 towards the base; behind the central area the tip of the metathorax is 

 abruptly excavated and bounded above by a sharply defined carina 

 which ends on each side in a prominent, subacute tubercle; sides of 

 the metathorax more densely rugose ; tegulae piceous. Wings long and 

 narrow, hyaline with a slight tinge of yellowish-fuscous, and a sub- 

 metallic, iridescent reflection; nervures and stigma black, the former 

 piceous at base, the stigma with a white dot at base. Legs elongate, 

 piceons-black; the four anterior tibia) stouter than their femora ; the 

 anterior legs in front and all the tarsi, brownish, the extreme tips of 

 the latter black ; anterior tibial with a yellow spot at the base within. 

 Abdomen 'about twice as long as the head and thorax ; first segment 

 one-third the length of the abdomen, depressed, finely sculptured, grad- 

 ually broader towards the tip and depressed on each side, the lateral 

 margins carinate. with a small tubercle on each side before the middle; 

 second segment with a deeply impressed oblique line on each side at 



