690 [December 



Male. — Head black: vertex nearly smooth, the face black, finely aciculate, a 

 ridge or carina from the vertex to the mouth, organs of the mouth with faintest 

 possible tinge of reddish-brown. Antennae: 1st, 2nd and 3rd joints black, the 

 remaining ones dark cinnamon. 3rd joint not deeply incised, 1-1-jointed. Tho- 

 rax black; collare hairy; mesothorax shining; two deep lines from collare con- 

 verging towards the scutellum ; space enclosed nearly smooth and hairless. 

 with very faint longitudinal grooves. Scutellum sculptured, the basal pits 

 large and deep. Lateral view of the scutellum shows as a cone, the axis of 

 which is at an angle of 45 deg. from the axis of the body. Legs dark brown or 

 black, coxae black; femur and tibia yellowish brown, on the upper side darker- 

 tips of tarsi black or nearly so; pleura very finely aciculate. Abdomen briefly 

 petiolate, shining black, 2nd and 3rd segments connate jointed. Wings pale 

 dusky; veins heavy, none of them reaching the margin; vein forming the base 

 of radial area with heavy brown blotch. 1st transverse reddish-brown ; areolet 

 small distinct; radial area open. Cubitus disappearing before reaching the first 

 transverse. Length (dry specimen) .11. 



Female. — ^Antennae 13-jointed, legs a shade darker than the male, otherwise 

 as the male, though as usual larger, .13 long. The ocelli form nearly a straight 

 line on the head. Abdomen in male and female perfectly smooth and shining. 



[n Mr. Cresson's Catalogue of described N. Am. Hymenoptera, Di- 

 plosis potent i I lee, Harris, occurs, taken from Dr. Harris' Catalogue of Ins. 

 Mass. 2nd ed. I have not seen Dr. Harris' catalogue. Should my 

 insect prove identical with his, I shall have only removed it to Dias- 

 trophus, the genus to which, without doubt, it properly belongs. 



The following remarks and description were communicated to me by 



Baron R. Osten Sacken, for publication in this paper : 



" In my paper entitled 'Additions and Corrections,' etc., (Proc. Entom. Soc. 1862) 

 I described a gall under the name of C q. strobilana (1. c. p. 254), the producer 

 of which was at that time unknown to me. Many months afterwards, I ob- 

 tained the fly, by cutting the dry galls open. It belongs to the genus Cynips 

 in the restricted sense (agamous according to Hartig), and I let its description 

 follow : 



Cynips quercus strobilana 0. Sacken. 



9. Antennae 14-jointed; body dark brown, with a close, appressed pubescence 

 on the thorax and along the hind margins of the abdominal segments: feet 

 brown; anterior knees and tarsi reddish; wings hyaline; length from 0.17 — 0.22. 



Head black, finely punctured and pubescent; palpi reddish; antennae rather 

 short for the size of the insect, 14-jointed; third joint about as long as the two 

 first, taken together; fourth, fifth and sixth gradually decreasing in length, the 

 sfeven penultimate joints being nearly as long as broad; the last segment is 

 somewhat longer than the preceding, although not equal in length to the two 

 penultimate joints taken together; it shows no indication of a sub-division. 

 Thorax densely clothed above with a yellowish, appressed pubescence, which 



