4i BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Antenna' 13-jointed, the scape alxnit one-third the length of the head, 

 curve«l, snbclavate, shorter in the 9 ; peilicol small, rounded. 



Maxillary palpi short, 4-jointed; labial palpi 2-jointed. 



Mandibles in S 4-dentate, the outer tooth a(!ute. 



Thorax elongate, the prothorax long, triangular, rounded in front; 

 mesonotum short without farrows; seutellum rounded behind, with a 

 transverse furrow at base; uietathorax sub([uadrate, roundedly trun- 

 cate in S ; longer abruptly truncate posteriorly in $ , with squared 

 sides. 



Front wings with only a single basal cell and a punctiforui marginal 

 vein; no stigmal vein, tlie costal cell open; $ sometimes apterous. 



Abdomen subpetiolate, elongate, cylindrical, pointed at apex, the 

 second and third segments the largest, the apical margins of segments 

 3, 4, and 5 rcmndedly emarginate in 9 , in $ straight. 



Legs rather short and stout, the femora swollen, tibiie not spinulose, 

 the claws simjile. 



A genus closely allied to Scleroderma and the females apt to be mis- 

 taken for those of that genus; but the 4-jointed maxillary palpi and the 

 simple, not spinous, tibiae sufficiently distinguish them. The male is 

 recognized at once by the single basal cell in the front wings. 



Fi3rster characterized the genus from a single male, the female being 

 unknown to him. I have been enabled to perfect his diagnosis by the 

 rearing of both sexes from a cluster of cocoons found in an old stump 

 and from specimens of another species reared from the cosmopolitan 

 beetle Silranus sHritmmeuHiH. 



The siwcies ki;own to me in our fauna may be tabulated as follows: 



TABLE OF SPECIES. 



Wingless 9 2 



Wliij^.utf and 9 • 

 Hlack. 



Wings dusky; legs lirownish yellow A. nitbilipenxis, Ashm. 



Wings liyalino. 



Legs rnfo-piceous ; sutures of iihdominal segments rufous 



A. VIRCIXIENSIS sp. nov. 



Legs hliiek or piceous black; tarsi honey yellow; sutures of abdomen 



not rufous A, taksalih sp. nov. 



2 Head and thorax rufo-piceons; abdomen longer than the head and thorax 

 united, black, the tij) rufous. 

 Antenna- and legs brownish-yellow A. viH<iiNiKNSis, sp. nov. 



Ateleopterus nubilipennis Ashm. 

 Ent. Am., in, p. 97 ,? nee 9 ; Cress. Syn. Hym. i». 312. 



S . Length 3""". iilack, shining; very faintly closely punctulate, 

 but with a few coarser scattered punctures over the surface and 

 sparsely covered with a black pubescence. Antenna? 13-jointed, the 

 scape brownish yellow, the flagellum fuscous; the scape is one-third 



