260 BULLETIN If), UNITED STATES NATIONAL MUSEUM. 



Abdomen polished, the first segment and the second at extreme base, 

 striated, the liorn extending forward to vertex of head. Legs brownisli- 

 piceous, the ccixa; bhiek, the trochanters, base of tibiae and tarsd y«'l- 

 lowish, the anterior tibia' being mostly yellow excei)t above at the middle. 



Habitat. — Washington, I). C. 



Type in Coll. Ashmead. 



ACEROTA Forster. 



Hym. Stud, ii, p. 107 (1856). 



(Type not described ) 



Head transverse, the vertex subcoiivex, the occiput margined; ocelli 

 3, in a curved line, the lateral distant from the margin of the eye, but 

 slightly nearer to it than to the front ocellus; eyes rounded. 



Antennae inserted just above the dypeus, 10-jointed, in $ terminating 

 in a 4-joiuted club, the pedicel longer than the first funidar Joint; in <J 

 subftliform, the pedicel not longer than the first fun iclar Joint, tlie club 

 5- or 0-Jointed, the terminal Joint more than twice as long as the i)enul- 

 timate and scarcely thicker than the first funidar Joint. 



Thorax ovate, the mesonotal furrows distinct, deep, and entire; 

 scutellum convex or subconvex, separated from the mesonotum by a 

 transverse line, and with a freniim or carina posteriorly; metathorax 

 rather short. 



Front wings with the submarginal vein terminating in a stigma at 

 about one-third the length of the wing. 



Abd<mien long-oval, the first segment not or scarcely longer than 

 wide, striated, the second larger, occupying about lialf of the remain- 

 ing surface, the following segments short. 



Legs davate, the tibial spurs 1, 1, 1, the basal joint of posterior 

 tarsi, about 2A times as long as the second, 2 to 4 subequal, the last 

 not quite as long as the second. 



Closely allied to Inostemma, but the female without a horn at the 

 base of the abdomen, the mesonotal furrows more sharply defined, the 

 second funidar joint in the male longer and cylindrical. 



TABLE OF SPECIES. 



Head and thorax closely punt'tulate. 



Hind coxa' aloiio black .. 2 



All coxa; black. 



Mesonotiiui "vvitli a distinct longitudinal carina at the base of the middle lobe, 

 with irregular raised lines on either side of it. 



Antenna", brown-black A. CKCiDOMYi^, sp. nov. 



Mesonotum with no raised lines at base of the middb lobe. ^ 



Legs rufous, the femora and sometimes the tibia' fuscous or black. 



Face with fine longitudinal stria' toward base of antenuie, the middle of 



— .^„ — .. frons nearly smooth, shining ; antenme dull rufous. 



_ A. FI.ORIDANA Ashm. 



