1S02.] 



257 



Cynips quercus operator ii. sp. — Reddish; jxistoridi- part of the abdomen brown- 

 ish: wings wiliiout discal aroolet: 'J, antenniic I4-, $> 12-jointed; length of % 0.1, 



of 9 0.12— i).i;i. 



Head yollowish-rcd, especially on the underside ; tip of mandibles brown: an- 

 tennsp of % 14-joiuted; .'!rd joint distinctly excised inferiorly: t]\c i following 

 joints of about the same length, slightly shorter than the 3rd: the other joints 

 gradually, but slightly diminish in length towards the tij): 9 antennre 12-jointed. 

 gradually diminishing in length from the 3rd joint, the longest, excei)t the last 

 joint, which is a little longer and shows a slight indication of a subdivision in three 

 joints. Thorax reddish, very minutely sculptured; the two usual furrows between 

 the collare and scutellum delicate, but distinctly marked; a short groove on each 

 side between them and the basis of the wing: an indication of a ])air of other in- 

 termediate furrows beginning at the collare and not running farther than the mid- 

 dle of the thorax: scutellum roughly sculptured; its basal pits rather small. 

 Feet pale reddish, e.xcept the ungues, the hind tibice and the base of the hind 

 tarsi, which are brown. Abdomen brownish-red: its posterior part, esi^ecially 

 above, more brown ; large (2nd) segment smooth and shining: the other segments 

 with a microscopic puuctation. Ovipositor rather long, projecting IVom its elong- 

 ated sheath, which is directed upwards. Wings hyaline, very transparent ; areo- 

 let none ; subcostal vein, first and second transverse veins, stout, j)ale yellowish : 

 last segment of the subcostal vein (usually forming an angle with the remainder 

 of the vein and running towards the anterior margin) obsolete; radial vein and 

 latter ])art of cubitus pale and subobsolete: the anterior part of cubitus (between 

 the first and second transverse veins), altogether obsolete : anal vein hardly in- 

 dicated. 



2 % and 11 9 specimens. 



This .species is, at first glance, somewhat like C q. vi(/rfr 0. S. (1. c. p. 

 ()G, No. 17) which prodnces a swelling on the leaf of the same kind of 

 oak. Their resemblance consist principally in the coloring and in the 

 neuvation of the wings, which, in both species have no arcolet. The dif- 

 ferences, however, are the following (the description of C. q. nii/rse. given 

 in my former })aper nuiy be completed from this comparison) : — 



C. Q. OPERATOR. 



Si:.r: % 0.1 ; 9 0.12—0.13. 



Aiitiiiitft: 9 12-jointed, with a dis- 

 tinct indication of a loth joint. 



I l>,h, 



ovate, its dorsal ridge 



smooth, the segments being closely 

 a]iplied tn each other ; 



C. Q. NIGR^. 



S!zr: % 0.05; 9 0.09. 



Atifi'iinse: 9 14-jointed; or, if the 

 two last joints are taken for one, 

 13-, but by no means 12-jointed. 



Altihiiiini : much shorter, its dorsal 

 ridge much more convex, the seg- 

 ments being at angles to each other 

 and with intervals between their 



