110 Mr. P. Cameron on some 



able to discriminate it this summer. The following is a 

 description of the imago. 



Black, almost shining. Antennas about a fourth shorter 

 than the body, black, filiform, the 3rd and 4th joints 

 about equal, the rest becoming gradually shorter, and 

 more distinctly separated and truncated at the apex. 

 Head black, labrum and clypeus white, pilose, clypeus 

 incised, mandibles piceous at the tips; palpi fuscous ; vertex 

 finely punctured, and covered with depressed pile. Meso- 

 notum semi-opaque, finely punctured (more distinctly than 

 on the vertex), scutellum shining, almost impunctate; 

 cenchri obscure ; pleuras smooth, shining ; the edge of the 

 pronotum and the tegulas white. Abdomen a little longer 

 than the head and thorax, the apex bluntly pointed; cerci 

 very long, pointing outwardly ; sheath of saw projecting a 

 little beyond the end of the cerci, pilose. Legs white; 

 the extreme base of coxfe, the femora except at the base 

 and apex, the apex of the posterior tibiic and the tarsi black ; 

 the extreme apex of the anterior tibias and the apex of the 

 tarsi fuscous; calcaria short, wings hyaline, costa fuscous, 

 stigma large, fuscous at base, white at the apex ; the 3rd 

 submarginal cellule is longer than broad; the 2nd recurrent 

 nervure is received a good bit in front of the 2nd sub- 

 marginal. 



The $ is similar in coloration, the antennas are a little 

 longer, but not much thicker ; the underside fiiscous, and 

 the 3rd joint shorter than the 4th, the stigma fuscous. 



Length 2 — 2^ lines; alar. exp. 4^ — 5 lines. 



CYNIPIDiE. 

 Onychia. 



This genus was first mentioned by Westwood, in Loud. 

 Mag. 1833, p. 494, then by Walker, in Ent. Mag. ii. 517, 

 the Evania edlogaster, Rossi, being given by the latter as 

 the type, but his description does not agree Avith that 

 insect, nor has it ever been found in this country so far as I 

 can learn. The next mention of the genus is by West- 

 wood, in the Appendix to his Introduction, vol. ii. p. 6%, 

 where it is characterized as follows : — 



"Abdomen with the third segment very large, con- 

 cealing the posterior ones, petiole very short, scutellum 

 channelled throughout; antcnufe filiform, 14-jointed in $ , 

 13 in ?; cubital arcolets three; subcostal nerve not con- 

 tinued beyond the rib." 



