NORTH AMERICAN HYMENOPTEKA. 73 



Gall-flies. — Head Muck, vertex iniuutely rugalose ; aoteiiiise 14-joiiited, first 

 and sei'ond equal, and very pale yellow, third a little longer than the two pre- 

 ceding, slender; fourth equal to the first and second, the fourth brownish at the 

 tip, and the remaining joints dark brown, and of equal length. Thorax smooth 

 (microscopically punctate) black, shining, parallel lines obscure, parapsides dis- 

 tinct, but slender; scutellum small, obscurely punctate, fovese very small and 

 indistinct. Abdomen bright shining black, second segment very large, others (in 

 dry specimens) concealed by the second. Legs yellowish brown, middle of the 

 femur darker; claws simple. B^mjrs hyaline, veins slender, dull brownish yel- 

 low; areolet small, cubitus reaching nearly to the first transverse, radial area 

 long, open. Length : body, .08 inch. ; .11 inch ; antennse, .07 inch. 



Male. — Antennse 15-jointed, first joint dark at the base, second yellow, glob- 

 ular; base of the third, yellow; tip thickened, and with the remaining dusky 

 brown ; head, thorax and abdomen black ; legs slightly darker than the female: 

 abdomen small. Length: body, .09 inch. ; .11 inch. ; antennse, .09 inch. 



ANDRICXIS Hartig (subgenus Callirhytis). 

 *1. A. (Callirhytis) piilchra n. sp. 



Galls on the anients of Q. tinctoria (also Q,. rubra), when dry, 

 shrunken and shrivelled, and measuring from .10 to .15 of an inch 

 in diameter. They are polythalanious, each gall producing four or 

 five insects. The interior of the gall is of a very loose spongy tex- 

 ture and the outside, thin and papery and green like the leaves. 

 When fresh they are round and the size of a common red curi'ant. 

 They differ from the galls of Dryophanta pahistris O. 8., which is 

 sometimes found on the aments of Q. ilicifolia, in the thin and smooth 

 shell, and in being polythalanious. Flies of both sexes, appeari)ig 

 in May. 



Gall-flies. —Female. — Head and thorax black, and evenly punctate, except the 

 scutellum, which is evenly rugose ; antennse 14-jointed, the first short, thick ; the 

 second short, oval ; Ihird slender, one-fourth longer than the two preceding taken 

 together, remaining gradually shorter; all connate, but alike distinct, and « ith a 

 yellowi.sh almost, metallic hue ; cheeks grooved. Collare very broad ; mcsotho- 

 rax rounded, median line a slight depression, but punctate like the rest of the 

 surface, parallel lines rather broad and shallow, polished ; parapsidal furrows 

 very fine and extending throughout: lines over the base of the wings piesent, 

 but indistinct ; scutellum evenly rugose, fovete near together and rather deep, 

 and ovally elongated. Legs very dark brown, joints a shade lighter, ■ingues 

 simple. Wings hyaline, veins colorless, except the subcostal and transverse, 

 which are dark, but not black ; areolet wanting, radial area open. Length : body, 

 .08 inch.; wings, .08 inch. ; antennse, .07 inch. 



Male. — Antennse 15-jointed ; first short, black ; second short, ovate ; third lun- 

 ger than the first two, and slightly curved and incised ; all, except the first, with 

 the yellowish metallic hue noticed in the female. Abdomen very small. Legs 

 several shades lighter than those of the female, the posterior pair darkest: the" 

 somewhat longer antennse and the smaller abdomen are usual in this sex, and. 

 except as above, the two are quite alike. 



TRANS. AM. ENT. SOC. XVII. (10) MARCH, 1890. 



