No. 22.] HYMENOPTERA OF CONNECTICUT. 435 



slight yellowish stain in the break in the second longitudinal 

 vein, and the areolet and base of the radial cells all inclosed in 

 this yellowish stain or cloud; abdomen with the terminal seg- 

 ments brown. 



The galls of this species are irregular, kidney-shaped, pithy, 

 occur on the stems of huckleberry (Vaccinum), and range in 

 diameter from 12 mm. to less and in length from 12 to 25 mm. 

 or more. 



Stonington, March, 1906 (W. E. B.). 



Diastrophus Hartig. 



D. 'cuscutaeformis Osten Sacken. Blackberry Seed Gall. 

 PI. vi. Fig. I. 



Body mostly dark brown or black; antennae reddish, 14-jointed 

 in the female and seemingly 15-jointed in the male; legs red- 

 dish ; areolet wanting ; wings mostly hyaline, with a brown cloud 

 near the anterior margin on the angle formed by the second trans- 

 verse vein and the tip of the subcostal vein. 



The individual galls of this species are round, spherical, hollow 

 bodies about the size of small peas, and bristling with spines. They 

 are very characteristically massed together, the masses com- 

 pletely encircling the stem or branch of the blackberry on which 

 they occur. 



Has been found in Hartford, April, 1901 (L. F, Colton), 

 Stonington, 1907 (B. H. W.), and Mystic, 12, 14 March, 191 5 

 (I. W. Davis) ; and no doubt occurs all over the state on black- 

 berry, especially Rubus villosus. Torymus, Ormyrus, Tetrasti- 

 chus and Euryioma diastrophi have all been bred from galls of 

 this species. 



D. nebulosus Osten Sacken. Blackberry Knot Gall. PL vi. 

 Fig. 2. 



Female 2.5 mm. long; male 2 mm. long; pitch-black, smooth 

 and polished above, antennae reddish, 13- jointed in the female 

 and 14-jointed in the male; legs reddish; wings hyaline, areolet 

 distinct, second transverse vein and tip of subcostal vein slightly 

 clouded. 



The galls of this species are rather cylindrical swellings with 

 an uneven surface, occurring on blackberry stems. The cells con- 

 tained within the gall are surrounded by a homogeneous struc- 

 ture that becomes very hard when dry. These swellings, which 



