376 [Mat 



4. Synergus campanula, n. sp. 9 • 



0.08 — 0.10 long. Head black, except the face, which is brownish below the 

 antennae and brownish-yellow above the mouth; the brownish or yellowish co- 

 loring sometimes extends above the antennas in the shape of a narrow stripe 

 along the eyes ; vertex black, little shining, smooth. Antenna? brownish-yel- 

 low, a little shorter than the body; 14-jointed ( 9 ) : the fourth joint is a little 

 shorter than the third, the following joints gradually decrease in length; the 

 fourteenth is about once and a half the length of the preceding joint. Thorax 

 deep black, and but little shining, with dense, delicate, transverse rugae, evenly 

 spread over its upper surface, which is also clothed with a short, fine and scat- 

 tered pubescence; parapsidal grooves not very deep, but distinct: a vestige of 

 an intermediate furrow, especially visible in a certain light, towards the scu- 

 tellum; two minute, parallel, glabrous lines, running a short distance from the 

 middle of the collare, backwards; (they are visible under a strong lens only): 

 scutellum rather large, gibbose, densely and deeply rugose: its basal foveas ra- 

 ther small; pleura? with a smooth, black, polished space, the lower part of which 

 is finely aciculate; scapula? yellow. First segment of the abdomen longitudi- 

 nally striate; the second segment, concealing all the following, has the shape 

 of a regular oval when seen from above; seen from the side its longitudinal dia- 

 meter is about equal to the transverse one; its outline is almost that of half a 

 circle, which has a flat arc (the dorsal side of the segment) instead of a diame- 

 ter; the ventral valve or the tip of the sheath of the ovipositor are sometimes, 

 but not always, protruding beyond the hind edge of the second segment; the 

 abdomen is polished, black, sometimes brownish along the hind edge; feet 

 brownish-yellow, tips of the tarsi brown; veins of the wings pale; areolet of 

 medium size, almost obsolete, as one side of it only (the prolongation of the se- 

 cond transverse vein,) is short and distinct. 



Three $ specimens reared from the gall of Cy nips q. globulus Fitch, 

 (white oak) and seven from a somewhat similar gall ( Quercus bicolorP), 

 described by me in Proc. Ent. Sue. I. p. 250. 



■'/. Synergus dimorphus n. sp. % £. 



Female. 0.12 — 0.13 long. Head black, except the face, which is brownish- 

 red, mixed with black, below the antenna;; mandibles (except their tip, which 

 is black), and more or less space near their roots on the cheeks, yellowish ; the 

 brownish coloring of the face extend above the antennae, in the shape of a nar- 

 row stripe along the eyes : vertex black, moderately shining, with sparse, broad, 

 flat-bottomed punctures. Antennae brownish-yellow, 13-jointed, about three- 

 fourths the length of the body ; the fourth joint is a little longer than one-half 

 of the third; joints four, five and six are nearly of the same length; the follow- 

 ing joints are somewhat shorter; the last joint is about equal to the two pre- 

 ceding taken together. Thorax black, moderately shining, with very rough, 

 but not very dense transverse rugosities ; pubescence short and very sparse ; 

 parapsidal grooves well marked, punctured at the bottom; scutellum coarsely 

 sculptured; its basal foveae are indistinct : the smooth space of the pleurae is 

 almost entirely aciculate; scapulae brownish-yellow. First segment of the ab- 

 domen longitudinally striate; the second segment, concealing all the follow- 

 ing, has the shape of an elongated oval, when seen from above; seen from the 

 side, its longitudinal diameter distinctly exceeds the transverse one; the ven- 

 tral valve, ending in a short, pubescent point, usually projects beyond the edge 

 of the second segment, its angle is about 60° or 70°; abdomen polished, black ; 



