420 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



as wide as long, the second segment occupying about one-half its 

 surface, the ovipositor more or less exserted. 



This species is probably an inhabitant of Quercus alba, the 

 white oak. , ' 



A. nigrae Osten Sacken. 



Female: reddish brown on head and thorax, abdomen dark 

 brown and shining; antennae 14-jointed, with indication of an 

 additional joint in certain lights, brownish yellow ; anterior legs 

 brownish yellow, intermediate or middle legs darker brownish 

 on the femora and tibiae, posterior legs still darker brown, all 

 tarsi brownish yellow with infuscated tips; wings hyaline, sub- 

 costal and radial veins colorless or almost pellucid, areolet want- 

 ing, cubital veins very indistinct. 



Of the two original galls from which this species was bred both 

 were found along the midrib on the under side of a leaf of 

 Quercus nigra or blackjack oak, one extending for about 25 mm. 

 along the midrib, the other shorter, both greenish and about 5 

 or 7.5 mm. broad, and each containing several gall flies, which 

 emerged between the 20th and 22d of June, the larger gall there- 

 after appearing to have been pierced nine times. 



A. frondosus Bassett. 



Only the gall of this species is known. This is a cone-like 

 body, developed from the axillary leaf buds, and covered, when 

 immature and often when dry, with a dense rose-like cluster of 

 imperfectly developed leaves. The cell containing the larva is 

 smooth, shining, oval, about one-eighth of an inch long, half 

 immersed in the apex of the cone, and occurring on Quercus chin- 

 quapin. These galls are developed after the summer growth of 

 the tree is complete and the axillary buds are formed. The rudi- 

 mentary leaves are green, ligulate, and the more perfectly devel- 

 oped galls resemble the flowers of the common garden Artemisia. 

 The clump of oak bushes from which the original specimens were 

 gathered was covered with them. 



A. topiarius Ashmead. Leafy Bower Gall. 



Female : length a little more than 2 mm. ; uniformly red 

 brown, punctate; eyes dark brown, antennae 13-jointed, slightly 

 longer than the thorax and very slightly thickened towards the 

 tip ; thorax with the usual grooves so characteristic of this genus, 



