42 BILLETIN 43, UNITED STATES NATIONAL MUSEUM. 



it, it ditieis in the more slender, 4-de,iitate inaiidibles, in having 4-joiiited 

 maxilhii y pali»i, and a shorter nietathorax. 



The female resembles Pristocera and Scleroilerma, but the maxillary 

 palpi are 4, the labial 3-j()inted, tht^ S(?utellnm distinct, while the nieta- 

 thorax is quadrate, not or scarcely contra(rted at base, the middle tibia; 

 not spinous. 



Four species are known to nw in the nnile sex fr<mi St. Vincent, West 

 Indies, and two from the Tnited States. 



The species in our fauna maybe distinguished as follows: 



Whigless9 2 



Winged ^ . 



Mesonotnni with 2 distinct furrows. 



Lf gs, including coxsp, yellow ; head opaque, finely, densely punctulate, with 



no frontal furrow D. x anthc >pus sp. nov. 



Legs yellow, the hind coxie black or black basally; head shining, feebly 



punctulate, with a frontal furrow D. californicus sp. nov. 



2. Abdomen black. 



Thorax, legs and anteun:e testaceous; he.ad rufo-testaceous D. xanthopits 



Thorax, legs, and anteunie brownish-yellow ; h«ad blackish. . . . D. carolinensis 



Dissomphalus zanthopus sp. nov. 



(Pl.ii,Figs.7, <?; 8, 9.) 



9. Length, 3.5°"". Head rufo-testaceous; thorax, legs and Jinten- 

 nae flavo-testaceous ; abdomen black. 



Antenna? 13-jointed about the length of the head; the scape clavate, 

 one-third the length of the head; tiagellum subclavate, involuted; pedi- 

 cel longer than the first flagellar joint; first flagellar joint the slender- 

 est, a little longer than thick, narrowed basally, the following joints 

 very gradually becoming stouter, but not, or scarcely, longer than thick. 



S. Length, 2.S""'". IJlack; the head opaque, finely imnctulate; 

 thorax shining but still microscopically punctate, the mesonotum with 

 two furrows and a grooved line on the shoulders; mandibles pale rufous 

 with 4 nearly equal teeth; palpi white; legs, including the coxa*, yel- 

 low. Antenna; 13-jointed, the scape, pedicel, and first flagellar joint, 

 yellow, remaining joints fnscous; the flagellar joints except the first, 

 are about one and a half times as long as thick, densely i)ubescent, the 

 last a little h)nger than the penultimati\ Metathorax snlMjuadrate, a 

 little wider than long, almost smooth, being only slightly rugose at base 

 and with a median carina extending to the snpcrior edge of the trun- 

 cature. Wings hyaline, the venation yellowish; the stigma is 3^ times 

 as long as thick, a little narrowed at base and tnincate at apex. Ab- 

 domen oblong-oval, not as long as the thorax, black, highly polished, 

 the anus yellowish; the two small tulxMcles on the second segment are 

 widely separated, situated at the basal angles. 



Habitat. — Arlingtxm, Va., and Cedar Point, Md. 



Type S 9 in Coll. Ashmead. 



Described from 3 si>ecimens. 



