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



a branch springing therefrom along the margin of the radial 

 area, showing a tendency toward a closing at the radial area; 

 legs 'clear and dark amber color, base of trochanters and middle 

 of femora and tibiae shining brown; abdomen mostly black, 

 smooth, and with the ventral sheath clear shining brown. Male : 

 smaller' than the female and essentially different otherwise as 

 follows: antenna 14-jointed, third joint deeply incised, the 

 antennse and the legs slightly darker than in the female, length 



2.2 mm. 



The galls of this species are to be found on the roots of 

 Rubus villosus and have the following characteristics: shape 

 irregular, size ranging from that of the pea to 50 mm. or more 

 in length and nearly 25 mm. in diameter, few or many larvae 

 within according to size. Sometimes the galJs are present on the 

 portion of the stalk which is below the ground. 



The type locality for this species is Connecticut. 



*D. minimus Bassett. 



Female: length 1.5 mm.; mostly black; antennse 13-jointed, 

 first and second ovate, the third straight, the following joints 

 uniform in length ; thorax smooth and shining, parapsidal grooves 

 closely converging toward the scutel, which latter has a finely and 

 regularly rugose surface and a shining fovea; wings faintly 

 dusky, veins very dark and distinct, areolet subobsolete, cubitus 

 reaching the first transverse vein, radial area open, second trans- 

 verse vein especially dark and distinct; legs pale reddish brown; 

 abdomen smooth and shining. Male: length 1.2 mm.; antennae 

 14-jointed ; legs rather lighter yellowish brown than in the female, 

 in nearly all other particulars like the female. 



The galls of this species occur as globular or oval blisters 

 arising abruptly between the nodes of the stems of Potentilla, 

 are often more than 1.5 mm. in diameter, are dark, smooth, and 

 contain one or two larval cells. 



Connecticut is probably the type locality of this insect. 



D. bassetti Beutenmiiller. 



Male: length 4 mm.; body jet-black, shining; head with a 

 number of shallow punctures from each of which grows a yellow- 

 ish hair, mouth-parts pitchy brown, antennae testaceous, 13-jointed 

 the first joint much thicker at the apex than at the base, second 

 joint almost globular and nearly half as long as the first, which 



