No. 22.] HYMENOPTERA OF CONNECTICUT. 373 



25. Base of scutel with deep or moderately deep and not trans- 



verse fovese; marginal cell open at the wing margin, some- 

 times closed in D. radicum; claws of posterior tarsi biden- 



tate Diastrophus p. 435 



Base of scutel without fovese but with a transverse furrow 



Solenozopheria p. 434 



26. Metathoracic carinas strongly curved, rarely indistinctly so, in 



Loxaulus almost straight, in which case the scutel has a 



transverse groove; antennae 15-jointed 27 



Metathoracic ridges straight and parallel, or very slightly 

 curved; antennae 14- to 16-jointed, third joint longer than 

 fourth; mesothorax with two sharply defined, entire parap- 

 sidal grooves, base of scutel with two very distinct foveae; 



abdomen usually not pedunculate, rarely slightly so 



Andricus p. 409 



27. Parapsidal grooves sharply excavated and entire, mesothorax 



polished, or moderately coarsely wrinkled 28 



Parapsidal grooves feebly defined or absent, mesothorax 

 finely alutaceous, claws of posterior tarsi entire; cheeks 

 with a sharply defined furrow, head broader behind eyes; 

 base of scutel with an arcuate transverse furrow, metatho- 

 racic ridges almost straight and parallel; abdomen not 

 petiolate Loxaulus p. 395 



28. Reddish yellow; third joint of antennae longer than fourth, 



externally strongly emarginate, and abruptly thickened 

 near the notch; mesothorax polished, base of scutel with 



two sharply defined foveae; abdomen not petiolate 



Biorhiza p. 383 

 Mesothorax not reddish yellow and at the same time pol- 

 ished; abdomen distinctly petiolate; claws of posterior 

 tarsi bidentate; posterior margin on upper side of second 

 abdominal segment prolonged obliquely into a tongue-like 

 process; head, thorax, and abdomen, black; mesothorax 

 polished or nearly so Dryophanta p. 396 



Periclistus Foerster. 



P. pirata (Osten Sacken). Rhodites globulus Beutenmtiller. 

 Aulax pirata Osten Sacken. Globular Rose Gall. 



Length 2 to 2.5 mm.; black, with legs and antennae reddish 

 yellow, base of coxae, however, also black ; wings hyaline ; mandi- 

 bles sometimes reddish; antennae somewhat brownish in some 

 females; male antennas 14-jointed, the third joint very strongly 

 excised on the under side; female antennae 12-jointed, third joint 

 not excised, last joint much longer than preceding but not quite 



