114 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



abdomen (more particularly the unsculptiired second tergite and 

 sternite), coxae, middle and posterior femora, and tibiae on apical 

 half, amber-colored to dark brown. 



Type locality. — Washington, District of Columbia. 



Type.—^o. 25448, U.S.N.M. 



Described from the type specimen. 



4. SACTOGASTER MUCRONATA, new species. 



Female. — Length 2 mm. Face, cheeks, vertex and occiput finely 

 and evenly shagreened; vertex rounded, not acute; projection 

 between antennae narrow, subacute at apex; third antennal joint 

 slightly shorter and a little narrower than fourth which is about 

 twice as long as wide; fifth and sixth antennal joints subequal, 

 nodose, about as wide as the fourth; mesonotum and upper part of 

 pronotum finely shagreened; remainder of thorax (except scutellum) 

 smooth and shining; notauli extending slightly anterior to the 

 middle of the mesonotum; spine on scutellum short, straight; wings 

 hyaline; first tergite very short, hardly visible beneath a ring of 

 silvery hair which extends upon the. second tergite ; second sternite 

 extending to the apex of the third segment; fourth tergite one and 

 one-half times as long as the third, a little less than twice as long as 

 wide, finely longitudinalh' striate except at extreme apex; second 

 tergite not at all sculptured; third quadrate, longitudinally striate in 

 a transverse band which widens on the side; fifth tergite about as 

 long as the two preceding, a little over three times as long as wide, 

 finel}^ longitudinally striate all over; sixth tergite about as long as 

 the three preceding, a little over six times as long as wide, slightly 

 swollen just before the apex and subacute at tip, finely longitudinally 

 striate except at and near the apex; third to last segment inclusive 

 as long as rest of body. Black; shining brilliantlj^ under a strong 

 light; base of scape, trochanters, anterior tibiae (except at middle), 

 tibiae of middle and posterior legs at extreme bases, and all tarsi 

 (except last joint of each), amber colored. 



TVpe.— Cat. No. 25449, U.S.N.M. Type and paratype. Para- 

 types in author's collection. 



Type locality. — Carlisle, Pennsylvania. 



Described from five specimens collected by the author. Two speci- 

 mens were collected July 16, 1920, on the leaves of a mulberry tree. 

 The other three were collected July 16 and 27 on the leaves of a wild 

 cherry tree within a few feet of the mulberry tree just referred to. 



This species comes closest to hoivardii of Ashmead. It is, however, 

 very readily distinguished from that species by the color of the scape 

 and by the sculpture and structure of the abdomen, characters used 

 in the key to the species. 



