242 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Tbe parasitism of several of the species is known, and all are ])ara- 

 sites in locust eggs, belonging to the family Acridiidse. 



Some of the species bear a remarkably close resemblance to the 

 Eurytominffi in the family Chalcididie; and, this remarkable mimicry 

 caused Dr. Riley to erect a new genus, CaJoptenohia^ in that family for 

 the reception of a species of IScelio, reared by Mr. Samuel 11. Scudder 

 from the iiggs of a locust found in Massachusetts. 



TABLE OF SPECIES. 



Species with parapsidal farrows more or less distinct 3 



Species without parapsidal furrows, coarsely reticulately rugose. 



Coxre aud legs jiale brownish-yellow 2 



Coxa} black or brown-black ; rest of legs brownish-yellow. 

 Wings fuscous with a stigmal vein and a radius. 



Scape and pedicel brownish-yellow, the tiagelluin brown-l)lack ; teguhc rufous. 



S. KUSCiPENNis Ashm. 

 Wings hyaline; no stigmal vein and radius. 



9 wit)i the scape beneath pale; pedicel ^ longer than the first flagellar joint; 

 secojjd, third, and fourth flagellar joints very short transverse, the 

 tliird a little the longest, 21 times wider than long. 

 ^ with the scape dark brown, flagellar joints, except first and last, about e([ual 

 in length and width, the third scarcely wider than the fourth. 



S. HYAMNIPENNIS Ashm. 



2. Stigma with a stigmal vein. 



Scape and pedicel yellowish, the flagellum brown-black, the first flagellar joint 



shorter than the pedicel. 



Venter distinctly, coarsely striate, but not punctured 9 ; venter with oblong 



punctures, the surface aciculated, anteunie pale brownish, the third 



flagellar joint much wider than the others <? . . .S. ovivoRUS Kiley. 



Stigma without a stigmal vein. 



9 unknown. <? with the third flagellar joint wider than either the second or 

 fourth; venter distinctly striated. 

 Antenna* brown-black; scape brownish-yellow; wings hyaline. 



S. PALLIDIPES, sp. nov. 

 Antennae wholly brownish-yellow ; wings subfuscous. .S. pallidicornis, sp. no v. 



3. Coxaj dark brown or black ; rest of legs brownish-yellow. 

 Wings hyaline; no stigmal vein. 



Scajie and pedicel brownish-yellow S. (KDIPod.e, sp. nov. 



Antennte wholly brown-black S. opacus Prov. 



Coxai and legs pale brownish-yellow. 

 Wings hyaline or but slightly tinged. 



Stigma without a stigmal vein; scape and pedicel, and sometimes the first two 

 or three flagellar joints pale. 



Abdomen mostly rufous S. rufiventhis, sp. nov. 



Abdomen black, the venter piceous S. calopteni Kiley. 



Stigma with a short stigmal vein; scape alone pale, although the pedicel and 

 the first flagellar joint are sometimes pale beneath. 

 9 postscutellum striate; abdomen delicately longitudinally striated, the ex- 

 treme apex of the segments smooth polished; angles of metathorax 



on a line with the apex of the metonotum S. luggeri Riley. 



9 postscutellum ]iunctate; al)domen longitudinally lineated, the venter, ex- 

 cept first and second segments, smooth ; angles of metathorax rather 

 prominent, covered with a white pubescence. .S, floridanus, sp. nov. 



