No. 22.] HYMENOPTERA OF CONNECTICUT. 423 



added, the description of Quercus tumifica given by Osten 

 Sacken. 



*A. pattoni Bassett. 



Female: length 2 mm.; head reddish brown; antennae 14- 

 jointed, dusky brown, the last two joints indistinctly separated 

 by a closely connected suture, entire head and face covered with 

 short white hairs, tips of the mandibles black ; thorax a very 

 dark shining brown, appearing black in certain lights, its surface 

 finely and evenly reticulate, the parapsidal grooves closely con- 

 vergent at the scutel, the short line usually present over the base 

 of each wing wanting in this species, a few scattered hairs on 

 the borders of the mesothorax, most abundant at the base of the 

 wings, scutel rugose and hairy, its f ovese large and shallow ; legs 

 of uniform reddish brown, except the darker tips of the tarsi ; 

 wings hyaline, veins dark brown, areolet present, cubitus very 

 pale and sometimes quite disappearing before reaching the first 

 transverse vein, radial area open, abruptly terminated by the short 

 curve of the radial vein ; abdomen shining blackish brown, lighter 

 beneath, the ventral valve projecting a little above the dorsal. 



The galls are clusters of larval cells along the midvein of the 

 leaves of Quercus obtusiloba, on the under side and standing per- 

 pendicular to its surface. The cells are completely hidden in a 

 short, dense, brownish wool. The largest clusters often extend 

 along the midvein more than half the length. They are found 

 on young trees, and usually on the leaves near the top of the 

 stronger growing shoots. This species lives over the winter in 

 the galls. The galls in their woolly covering resemble those of 

 A. Hocci of Walsh, but in the latter the woolly hairs are longer 

 and that species is found only on Quercus alba. 



Type locality : West Rock, New Haven, 1876 (W. H. Patton). 



*A. utriculus Bassett. 

 Female : length 2.5 mm. ; head black, very finely rugose, face 

 sparsely covered with short stiff hairs, antennae 13- jointed, first 

 joint short, club-shaped, second globular, third long and straight, 

 fourth three-fourths as long as the third, fifth and succeeding 

 ones, except the terminal one, one-half as long as the third, thir- 

 teenth with an indistinct suture in the middle, antennae clear 

 yellowish brown at the base, gradually changing to a dull deep 

 brown at the tip ; thorax black, mesothorax finely rugose, parap- 



