NORTH AMERICAN HYMENOPTERA. 299 



Descriptions of Ncav Species. 



AiMPHIBOLIPS Reinh. 



A. melanocera Ashm. 



Galls. — Greenish brown and yellowish green round, globular galls, 

 issuing from bud axils of Qnerois aqnatica ; they vary greatly in size 

 from one-quarter to half an inch in diameter. The outer shell is very 

 thin, and interiorly there is a central kernel held in place by some very 

 thin hair-like filaments. 



Gall-fly. — %. Length .1S-.20 inch. Head, antennse and thorax black or 

 brown-black, sparsely pubescent; head and thorax coarsely rugoso-punctate ; an- 

 tennae 14-jointed, rather long; pleurte coarsely rugose; scutellum rugose, bifoveo- 

 late; coxiie black, anterior and intermediate legs brown, tibise darker, feet paler; 

 posterior legs black or brown-black; abdomen shining, red-brown ; wings hyaline, 

 veins dark, and a large brown blotch at base of radius with a pale centre. 



This species resembles Aiytphlbolips cifriformis Ashm., but is easily 

 distinguished by its dark antennae and by the black posterior legs. The 

 gall, too, is markedly different in sliape, although constructed on the same 

 plan as in that species. 



Described from eight specimens bred in June. 



ANDItlCHN Hartig. 

 A. qnereilblise Ashm. 



Galls. — Succulent, round gall on the leaves of Qnerctis Catesbsei, 'With 

 a loose, whitish kernel ; constructed in the same manner as Diyojyhauta 

 aquaticse, but much smaller in size. 



Gall-fli/.--%, . Length .07 inch. Black, shining ; sparsely j^ubeseent and mi- 

 croscopically scratched ; antennie 14-jointed, honey yellow at base, brownish to- 

 wards tip; thorax smooth, parapsides distinct; scutellum rugose, pubescent ; ab- 

 domen polished black, slightly compressed; legs honey yellow ; wings hyaline, 

 veins brownish. 



The above is described from three bred specimens which issued from 

 galls in May. The galls are rare, and the flies difficult to raise. 



.4. qiiinqiie^^eptuin Ashmead. 



Galls. — Hard, globular galls on leaf petiole of Quercus obtusiloba, 

 projecting equally above and below ; rounded beneath, but above with a 

 prominent projection or nipple. The gall at first is of a beautiful smooth, 

 reddish brown, microscopically pubescent, but turns black with age. In 

 diameter it measures one-quarter of an inch, and interiorly is divided 

 into five longitudinal partitions, the fly living in the centre. 



Gall-fly. — %. Length .12 inch. Head and thorax brown, very finely punc- 

 tured, sparsely pubescent, the pubescence being denser on the face; antennse 14- 

 jointed, yellowish, gradually thickening towards tip, third joint as long as one 

 and two combined, following joints sub-equal, terminal joint very small ; parap- 



