NORTH AMERICAN IIYMENOPTERA. 141 



GaU-fly. — 9 • Length .05 inch. Black, smooth and shining. Antennae pale 

 ye.llo\vi.sh brown ; legs pale yellowish, all tihiff and femora more or less infuscated 

 in the middle, black or brown ; abdomen large, globose, black and shining; wings 

 hyaline, radial area open, very long and narrow, areolet distinct, cubital cell 

 open ; length of wing hardly .06 inch. 



Several specimens bred. The fly very strikingly resembles Neu- 

 roterus verrucartim, but the gall is very distinct and cannot be con- 

 founded with it. 



20. .iinphibolips spiiiosa u. sp. 



Gall.— A small, brown globular gall, covered with prickles or spines; the shell 

 is thick and covers with a slight spongy substance, a thin larval cell; diameter 

 .30 inch. 



Gall-fly. — 9- Length .18 inch. Color reddish brown, finely sparsely pubes- 

 cent. It closely resembles Amphibolips citrifonnis, and can only be distinguished 

 by its slightly darker color, less coarsely rugose thorax, more densely pubescent 

 legs. The basal vein, tip of submargiual vein and the cjoud at base of marginal 

 cell are distinctly black ; the areolet, too, is smaller than in that species. 



Described from one specimen reared in January. 



21. .\n(Iricus remoratus n. sp. 



Gall.— A small, very thin shelled globular gall, containing a larval cell held in 

 place by fine radiating filaments ; diameter .30 inch. 



Gnll-fly. — 9 • Length .12 inch. Head and thorax brown-black, coarsely ru- 

 gosely punctate, the parapsidal grooves almost obliterated by the coarse sculpture, 

 as in the genus Amphiholips. Antennae and legs pale yellowish brown, the pos- 

 terior femora very greatly swollen, as in certain Chalcids, black. Abdomen 

 black, polished, second segment greatly lengthened. Wings dusky hyaline, pu- 

 bescent, cubital cell not quite closed. 



Described from one specimen reared ]May, 1886. It is very re- 

 markable and interesting from its swollen femora, but ^\\i\\ this ex- 

 ception does not depart from many normal species in the genus. 



22. Au«lri«'us calycicola n. sp. 



Gnll. — A small, smooth, hard, but thin shelled globular gall form .10 to. 15 inch 

 in diameter, issuing from a bud, but occasionally enclo.sed by the bud scales or 

 by an aborted acorn cup. This gall develops very rapidly in the fall (October) 

 and it drops to the ground where under the fallen debris the final transforma- 

 tions of the single enclosed larva is consummated, gnawing its way out of the 

 gall in February. 



Gall-fly.— Color brownish yellow, posterior tibisB dusky; eyes and abdomen 

 black. Head and thorax rugoso-punctate as in the preceding species; antenna 

 13-jointed ; wings hyaline, glassy, veins yellowish, the marginal vein pale, areolet 

 small, its surrounding veins pale and faint, cubitus subobsolete. 



23. l'allirli^'ti!<i cellt« n. sp. 



Gall.— A slight fleshy swelling along midveiu, covering two or more small 

 cells; diameter of cells .OS to .10 inch. 



