.\MKRICAN IIYMKNUPTKKA. 97 



SyiK'rvTiiM 4*acii pan Ilia O. S. 



Si/nerfiii.i ciiinixtnnlii (). S., Proc. Ent. Soc. Phila. iv. 18G5, p. '.Yiii, n. 4, 9- 

 Synenjus campanula Ctesson, Syii. Am. Hymen. 1887, p. 180. 

 Synergns campanula I)e Dalla Torre. Cat. Hymen, ii, 1893, p. 110. 

 " Female 0.08 0.10 lonj;. Head black, except the face, which is brownish lielow 

 the antennse and brownish yellow al)ove the mouth ; the l)rownish or yellowisl) 

 coloring sometimes extends above the antenna^ in the shajie of a narrow stripe 

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

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

 than the third, the foHowing joints gradually decreasing in lengtii ; the fourteenth 

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

 and but little shining, with dense, delicate rugre, evenly sjnead over its upper 

 surface, which is also clothed- with a short, fine and sciittered pubescence ; parap- 

 sidal grooves not very deep but distinct : a vestige of an intermediate furrow, 

 especially visible in a certain light towards the scutellum ; 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 fovese rather small ; pleurae with a smooth, polished, 

 black space, the lower part of which is finely aciculate ; .scapulae yellow; firet 

 segment of the abdomen longitudinally 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 diameter is about equal to its transverse one ; its 

 outline is almost that of half a circle, whicii has a fiat arc (the dorsal side of the 

 segment) instead of a diameter ; the ventral valve or the tii> of the sheath of the 

 ovipositor are sometimes, but not always, protruding beyon.l 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 (tlie jirolon- 

 gation of the second transverse vein) is short and distinct." 



Baron Osten 8acken's s[)ecimens were bred from gall.s of Ho/casjils 

 (jlobiUaa Fitch and similar galls, probably those of H. durlcoria 

 Bass, from Qiiercus bicolor. 



I have a number of specimens bred from galls of Holcaspis diiti- 

 corla Bass, sent me by Mr. F. E. iMoesier, Buffalo, N. Y., and a few 

 specimens bred from galls of Biorrhiza forticornis Walsh, collected 

 by IMr. C. F. Baker at St. Croix Falls, Wis. 



9$ynorgus albipes (Walsh). 



Synuphnis tilbipe.i Walsh, Proc. E. S. Phihi. ii, 1864, p. 47!) and 4*J6, n. 17. 9 ^ . 



Synenjns ulbipe.s Cres,son, Syn. Am. Hymen. 1887, p. 180. 



Synergus lanx De Dalla Torre, Cat. Hymen, ii, 1893, p. 111. 

 " DittVi-s from Ixviveutris O. S. only as follows: First. Tlie entire body, includ- 

 ing the head, with the e.'cception of the palpi which are whitish or pale yellowish- 

 is always black. Second. The antennse of the female are 14-jointed (not 13- 

 jointed), the last joint one-third longer than the preceding one. Third. The 

 seiond abdominal joint always covers the terminal joints l)oth in male and female. 

 Fourth. The legs are wliitish, scarcely tinged with yellow, with the tarsal tips 

 brown, but otherwise immaculate in a single male, where the hind femora and 



TK.\NS. AM. KXT. SOC. XXIII. (13) MARCH, 1896. 



