1865.] 375 



the gall of C. q. podagrse (Quercus tinctoria), seem to have had in 

 general a darker coloring than my specimens, reared from the gall of 

 C. q. cornigera (Q. palustris), it is probable that we have here a^ain an 

 instance of two races of the same species living on different trees. The 

 differences between this species and 8. oneratus have been detailed 

 under the head of the latter species. 



?>. Synergus laeviventris 0. 8. 9 • 



Syn. Synophrys f Iceviventris 0. S. Proc. Ent. Soc. Phil. I, p. 57. 



Synophrus IcEviventris Walsh, Proc. etc. II, p. 494. (Exparte.) 



0.07 — 0.08 long. Head reddish-brown, vertex darker, antennae brownish-yel- 

 low, second joint not much shorter than the fourth, the third about one-third 

 longer than the fourth; joints four, five and six of about equal length; the four- 

 teenth or last joint is somewhat less than once and a half the length of the pre- 

 ceding; thorax black, moderately glossy, finely rugoso-puactate and pubescent; 

 scutellum gibbose, with a slight, sharp, recurved, elevated margin ; (thorax 

 and scutellum in older specimens often become brownish or reddish-brown) ; 

 parapsidal grooves distinct their whole length: foveas at the base of the scu- 

 tellum rather small, but distinct: pleurae black or brownish, polished and glossy 

 under the root of the wing, aciculate below, punctate anteriorly; first abdomi- 

 nal segment striate; the second segment, covering all the following, is chestnut- 

 brown or black, paler on the under side; its shape, seen from above, is elon- 

 gated-ovoid, the tip being drawn out in a point; the side-view is almost lanceo- 

 late, the tip appearing likewise pointed: held against the light, the valves of 

 the ovipositor, as well as the ventral valve, may be seen, concealed as they are 

 under their unusually long second joint: the ovipositor alone protrudes some- 

 times beyond the joint; feet brownish-yellow, extreme tip of tarsi more or less 

 brownish; (one of my specimens has the hind tibiae and tarsi somewhat infus- 

 cated); wings hyaline, veins pale; areolet almost obsolete, as one side of it only 

 (which is the prolongation of the second transverse vein,) is stout and distinct; 

 the two other sides, as well as the whole course of the cubital vein, are almost 

 obsolete. 



Four 9 specimens, reared from the galls of C. spongijica, C. centri- 

 cola and the gall on Q. falcata, described by me Proc. etc. I, p. 69, 

 No. 20. It may not be useless to observe that the European S. thau- 

 macera Dalm., which seems to be closely allied to our species, has the 

 third joint of the antennae enormously developed in the male sex. 



Mr. Walsh having had the kindness to communicate to me specimens 

 of the insects mentioned by him (Proc. Ent. Soc. II, p. 494) as Syno- 

 phrus Issoiventris O. S., I convinced myself that those specimens which 

 he had bred from the gall of C. q. spongifica really belong to the pre- 

 sent species; but that the specimeus obtained by him from the gall G. 

 q. forticornis are the species of Oeroptres mentioned above, p. 51, as C. 

 Jicus Fitch, and closely resembling *$'. Iseoiventris in its coloring. The 

 remarks of this author (1. c.) have to be sifted accordingly. 



