1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 669 



pale or yellowish ; wings hyaline ; stigma and veins brown ; the 2d 

 branch of the radius only half the length of the 1st, 



The antennae in the female are 13-jointed, brown-black, the tip of 2d 

 joint being pale, the joints of flagellum about two and a half times as 

 long as thick, the terminal joiut being longer than the preceding. 



The male has 14-jointed antennae, the joint of the flagellum being a 

 little more than twice as long as thick, the terminal joiut not longer 

 than the preceding; legs and abdomen brown; the 2d branch of the 

 radius is about as long as the 1st branch. 



Habitat. — Los Angeles. California. 



Described from -four specimens labeled No. 94, received from Mr. D. 

 W. Coquillett, reared from an Aphis on Baccharis viminalis. 



Lysiphlebus salicaphis Fitch. 



Trioxys salicaphis Fitch, First Report, p. 136. 



In the collection are specimens of a species, agreeing with Dr. Fitch's 

 description, labeled No. 105°L, reared by Prof. Riley from grape Aphis, 

 Siphonophora vitifolii Thos., in Missouri ; also other specimens reared at 

 the Department, September 10, 1886. 



DEERETUS Forster. 

 Diaeretus americanus u. sp. 



Ma te.— Length, l| mm . Black, smooth, polished ; two basal joints of an- 

 tennae pale yellow-ferruginous, flagellum dark brown; palpi, white; 

 collar sides piceous ; the triangular piece just beneath base of anterior 

 wing very hairy ; legs, pale brownish-yellow ; metathorax, black ; ab- 

 domen, brown, blackish toward apex; petiole, yellowish. 



The antenna) are longer than the insect, 18-joiuted; the joints of the 

 flagellum less than thrice as long as thick, the terminal joiut being 

 nearly twice as long as the preceding ; mesothorax smooth, polished, 

 the parapsidal grooves distinct, converging and almost meeting at base 

 of scutellum; metathorax areolated by a delicate medial longitudinal 

 keel and lateral keels, microscopically punctate, finely pubescent; ab- 

 domen ovate, the petiole very slightly longer than wide, the sides par- 

 allel. Wings, hyaline; the stigma and veins brown. There is a cu- 

 bital vein starting from near the apex of the basal vein, almost from 

 the parastigma, and extending entirely across the wing to the apex; 

 hind wing with a single closed humeral cell. 



EaUtat. — Lafayette, Indiana. 



Described from two specimens received from Mr. F. M. Webster. 



Diceretus Websteri n. sp. 



j|/«/ e ._Differs from the preceding in having 19-joiuted antenna- the 

 two basal joints yellowish, the 1st joint of flagellum being thrice as long 

 as thick, the following slightly shorter, the terminal joint not longer 

 than the preceding; the abdomen is brownish-yellow, dusky toward 

 apex, the petiole not longer than wide ; while the metathorax is with- 

 out the delicate longitudinal medial keel. 





