No. 22.] HYMENOPTERA OF CONNECTICUT. 44I 



R. ignotus Osten Sacken. Mealy Rose Gall. PI. vi, Fig. 3. 



Female : length 3.5 mm. ; legs, including coxse and abdomen, 

 reddish. Male : length 3 to 3.2 mm. ; mostly black, coxse and base 

 of femora black, rest of legs red. 



New Haven, on Rosa Carolina; Woodbridge, 12 May, 1907 

 (W. E. B.). 



R. dichlocerus Harris. Long Rose Gall. 



Female : length 3.5 mm. ; mostly brownish red, antennae black, 

 except the first, second and third joints, which are entirely or 

 mostly red. Male : length 2.5 mm. ; mostly black, base of abdo- 

 men red. 



The galls of this species are hard, woody, irregular swellings 

 about 50 mm. long and about 12 mm. in diameter, occurring on 

 the branches of Rosa Carolina. 



Mystic, 6 March, 191 5 (I. W. Davis). 



R. radicum Osten Sacken. Rose Root Gall. 



Mostly black, abdomen sometimes brownish, first and second 

 joints of the antennae sometimes reddish brown, mandibles red- 

 dish. Female : length nearly 4 mm. ; coxse dark reddish, except 

 at the base, where they are black. Male : length nearly 3.5 mm. ; 

 coxae black. 



The galls of this species are rounded, warty, smooth on the 

 outside, contain numerous cells that are separated by pithy 

 material, and occur on the roots of wild roses. 



R. rosae Linnaeus. Mossy Rose Gall. PI. vi. Fig. 5. 



Female : length 3-4 mm. ; mostly black, mandibles reddish ; 

 legs reddish, except coxae and tips of tarsi, which are black ; wings 

 pale brownish, with a brown cloud on the radial area and its 

 vicinity ; pleurae with two oblong shining areas ; abdomen reddish, 

 except the four last segments, which are black. Male: mostly 



black. 



The galls of this species are moss-like masses consisting of 

 hard cells covered with long and dense greenish filaments, the 

 cells arranged around a branch of rose or blackberry. 



Westville, 1904 (W. E. B.) ; Mystic, 3 March, 1915 (I. W. 

 Davis). 



°R. vernus Osten Sacken. Knotty Rose Gall. 



Mostly black. Female : length nearly 4 mm. ; abdomen mostly 

 red ; legs reddish, except the bases of the coxae, which are black ; 

 wings tinged with brown and with a more or less distinct cloud 

 on the radial area and its surroundings. Male: length 2.5 to 



