282 BULLETIN 45, TNITED STATES NA'^^'IONAL MUSEUM. 



last tlie largest, intermediate joints a little longer than thick; tubercle 

 at ti;) of sciitelluni subobsolete ; niesonotal furrows complete. 



Habitat. — San Francisco, Cal. 



Types in Nationj.1 Museum. 



Described fiom o and 9 specimens, reared November, 1885; from 

 a Cecidomyiid gall on Lnj)inn,s atfiorca, (collected by Albert Koebele. 



Polymecus picipes, sp. iiov. 



5. Length, 1.8 to 2™"'. Black, shining; head transverse, the vertex 

 posteriorly distinctly shagreencd ; face smooth^ polished, except a few 

 transverse lines just above the insertion of the antenna'; legs variable, 

 from a rufo piceous to almost black, the trochanters, tips of anterior 

 tibiip, base of u)i<ldle and posterior tibia', -and all tarsi pale brownish 

 or honey-yellow. Antenna' lO-Jointed, brown-black, the first funiclar 

 joint a little longer than thick, the second transverse, the third 

 quadrate, club joints obh>ng. Mesonotal furrows complete, the middle 

 lobe projecting slightly on the scutelluni, the lateral lobes with no 

 tufts of pubescence at base. Collar and mesopleura striated. Scutel- 

 luni highly convex, subopaque, without a tubercle at tip. Metathorax 

 bare or faintly pubescent. Teguhe blat;k. Wings hyaline. 



Abdomen more than twice as long as the thorax, the petiole coarsely 

 striated, the base of second segment with two aciculated foveohe at base. 



Habitat. — District of Columbia. 



Types in Coll. Ashmead. 



Several specimens. 



Polymecus melliscapus, sp. nov. 



9. Length, 25"". Black, subopaipxe, very faintly, microscopically 

 shagreened; the head behind and the face transversely aciculated. 

 Scape, pedicel, and legs brownish-yellow; llagellum black; pedicel 

 about as long as the first and second funiclar joints united ; joints 3, 4, and 

 5 of club not longer than wide at ai)ex, the last conical, scarcely twice 

 as long as the penultimate. Metathorax and petiole, above and below, 

 densely pubescent. Tegulic black. Wings hyaline, pubescent. Abdo- 

 men twice the length of the head and thorax iniited, the third segment 

 one-third the length of the fimrth, the fifth and sixth equal in length, 

 a little longer than the fourth, the sixth beiiig conical. 



Habitat. — Washington, D. C. 



Type in Coll. Ashmead. 



Described from a single specimen coUect^'d by Mr. E. A. Schwarz. 



Polymecus compressiventris, Hp. nov. 



9 . Length, 2.6"" . I*olished, black, impunctured ; the aiitennne and 

 legs golden-yellow, the fiagellum very slightly obfuscated at tip. The 

 pedicel is oval, not quite as long as the first and second funiclar joif^s 

 united; first funi<lar joint narrowe«l, but twice as h>ng as thick; the 



