4IO CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



*A. formosus Bassett. 



Female : length 3 mm. ; head black, finely and evenly rugose ; 

 antennae 15-jointed, yellowish red, the terminal joints darker, 

 suture between the fourteenth and the fifteenth joints as distinct 

 as the preceding ones, face with a short pubescence, the hairs of 

 which converge toward the mouth, mandibles black, palpi of a 

 color similar to that of the antennae; thorax black, with a few 

 short hairs on the pronotum, mesonotum with distinct parap- 

 sidal grooves and a median line which is broad where it ends at 

 the scutel but gradually decreases and disappears just before 

 reaching the pronotum, in addition between this and the parap- 

 sidal grooves two short lines beginning at the pronotum and ex- 

 tending half-way to the scutel; the thorax reticulate, almost 

 umbilicately punctate, scutel finely rugose, its foveae smooth and 

 shining; legs bright brownish red, except the upper part of the 

 femora, which is nearly black, and the coxae, which are entirely 

 black ; wings hyaline, as are the veins, except the first and second 

 transverse and the subcostal, which are very pale yellow, areolet 

 equiangular, bounded on the inner side by an entirely colorless 

 vein, radial area open; abdomen bright reddish brown, minutely 

 punctate, sheath of the ovipositor dark brownish red. 



The galls of this species were found in a cluster of forty or 

 fifty elongate, ovate, individual galls on a branch of a young red 

 oak tree. They were from 18 to 25 mm. in length and 12 mm. in 

 diameter in the middle, tapering to a point at both ends, covered 

 with a short velvety pubescence, and when dry they were ridged 

 like a cantaloupe. The inner structure, of a cork-like nature, 

 adheres closely to the larval cell and is divided lengthwise into 

 many parts by partitions corresponding to the outside ridges. 

 This gall is monothalamous and the cell is 2.5 mm. long. 



Type locality : Waterbury. 

 *A. pruinosus Bassett. 



Female: length 2.5 mm.; mostly shining black; antennae 13- 

 jointed, first and second joints light brown, all the following 

 gradually shorter to the apex which is dusky brown, in some 

 cases a faint suture on the apical joint; thorax subcompressed 

 from side to side, punctate and with a few scattered hairs, the 

 two median lines and the parapsidal grooves all even and dis- 



