42 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



it, it (litters in the more sleuder, 4-(leiitate inaudibles, in liaviny; 4-j(uiitecl 

 inaxillai y l>ali>i, and a sliorter luetatliorax. 



The female resembles Fristocera and Scleroderma, but tbe maxillary 

 palpi are 4-, the labial 3jointed, the scutellum distinct, while the meta- 

 tliorax is quadrate, not or scarcely contracted at base, the middle tibise 

 not spinous. 



Four species are known to me in the male sex frimi St. Vincent, West 

 Indies, and two from the TTnited States. 



The spe<'ies in our fauna maybe distinj^uished as follows: 



Wingless 9 2 



Mesonotmn with 2 distinct furrows. 



Loo,s, iiichidiug coxii», yellow ; head opaque, finely, densely punctnlate, with 



no frontal furrow D. x anthopus sp. nov. 



Legs yelhiw, the hind cox;e hlack or hhick hasally; licad shining, feebly 



puuctulate, Avith a frontal furrow D. californicus sp. nov. 



2. Abdomen 1)lai'k. 



Thorax, legs and anteun;c testaceous; head rufo-testaceous D. xantiiopus 



Thorax, legs, and antennje hrownish-yellow ; head blackish . . . . D. carolinensis 



Dissomphalus xanthopus sp. nov. 



(PI. II, Figs. 7, c?; 8, 9.) 



9. Length, 3.5"^"'. Head rufo-testaceous; thorax, legs and anten- 

 nfE flavo-testaceous ; abdomen black. 



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

 one-third the length of the bead; tlagellum 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. 

 $. Length, 2.8""". Black; the head opaque, finely puuctulate; 

 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. AnteuufE 13-jointed, the scape, x>edicel, and first flagellar joint, 

 yellow, remaining joints fusc<ms; the flagellar joints excejit the first, 

 are about one and a half times as long as thick, densely pubescent, the 

 last a little longer than the penultimate. Metathorax subquadrate, a 

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

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

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

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

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

 the anus yellowish; the two small tubercles rtn the second segment are 

 widely sejiarated, situated at the basal angles. 



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



Type S 9 in Coll. Ashmead. 



Described from 3 si>ecimens. 



