345. 

 DECATOMA COOPERI. 



Order Hymenoptera. Fam. Cynipidae Lat.^ Leach. 



Type of the Genus, Decatoraa biguttata Swed. 

 Decatoma Spin., Curtis's Guide, Gen. 650. — Eurytoma Dal. 



Antennce inserted in the centre of the face, geniculate, pilose, 

 excepting the basal joint, which is received into a groove in front 

 of the face, longer in the male than female ; 9-jointed in the male, 

 the 1st joint long, 2nd curved subpyriform, two annuli forming 

 the base of the 3rd joint which is oval truncate, longer than the 

 3 following which are remotely articulated, the remainder form- 

 ing a narrow elongated club, the apex producing very short 

 spreading bristles (i) : 10 -jointed in the female, 1st joint long, 

 2nd slender, bent subpyriform, then follow I think 2 annuli, the 

 3rd joint obovate truncate, 4 following semioval, the remainder 

 forming an ovate or conical club (1 a). 



Mandibles subtrigonate, truncated obliquely and tridentate, the 

 apical tooth acute, the internal one blunt (3). 

 Maxilla: long and narrow, rounded and ciliated at the apex, and 

 producing a membranous dilated margin. Palpi slender, triarti- 

 culate, basal and 3rd joints long, the latter truncated obliquely 

 and pilose, 2nd joint subovate (4). 



Mentum rhomboid. Lip large, oblong, narrowed at the base, the 

 anterior margin sinuated. Palpi large, biarticulate, basal joint 

 truncate, 2nd subovate pilose (5). 

 Head broad, short, slightly concave in front. Eyes large, lateral. 

 Ocelli 3. Trunk oblong : prothorax large transverse. Scutellum 

 rounded. Wings remote from the head, pubescent, ?,Vi^Qx\o\- large, 

 obtuse, vnth a subcostal nervure, touching the costa beyond the centre 

 where it forms a short branch. Abdomen very small, subglobose and 

 attached by a long stout petiolus in the male : longer ovate, slightly 

 compressed, the petiolus much shorter and the apex acuminated, with 

 an ovipositor beneath in the female (6 ; a, the point of attachment) . 

 Coxae large, producing a transparent plate at the apex of the ante- 

 rior pair : thighs incrassafed, especially the posterior : tib'ae spurred, 

 posterior ciliated externally with a few spiny bristles : tarsi 5-jointed, 

 basal joint the longest: claws bent: puhiWi distinct (8, afore leg). 



CooPERi Curtis. 



Female black, pubescent, very closely and coarsely punctured j 

 underside of antennae, tip of the 2nd joint and the apex ochreous^ 

 face of the same colour : collar with a narrow orange border, 

 broadest before and interrupted behind ; base of the wings 

 orange : abdomen very smooth and shining : superior wings 

 with a sublunular brown stigma, black at the costa, the nervures 

 ferruginous : legs ochreous, posterior coxae black, intermediate 

 thighs with a streak of black, the posterior black except at the 

 base and apex, posterior tibiag black in the middle. 

 In the Cabinets of Mr. Cooper and the Author. 



