mOCEEDTXGS OF THE NATIONAL MUSEUM. 121 



joints all ai)j)ear delicately fluted. Meson o turn has three distinct 

 grooves, extending- its whole length, and the groove on the shoulder 

 is long. Scutellum minutely rugose, the foveas oblique, distinct, but 

 rather widely separated. Wiugs hyaline, with short pubescence. 



T>ipc.—l<fo. 3068, U.S.:^T.M. 



Seven female specimens, received from Prof. E. W. Ililgard, Oakland, 

 California, and reared November 10, 1876. The gall also occjirs on 

 Qiicrois (((/rifolia, and Professor Plley says: ''A woody deformation of 

 staminate aments and (piite abundant on .some trees." 



14. ANDRICUS EXCAVATUS, new species. 



Gall. — In the branches of the red oak, Quercus ruhrnm, toward the 

 end of summer, appear long hmgitudinal slits or fissures, filled with 

 irreguliirly shaped cells or kernels, which are usually smooth and jiol- 

 ished, and generally of an oval, flattened form. These are tlie larval 

 cells of a Cynipid, which fall to the ground in the fall, where the larviife 

 within undergo their final transformation. 



After the larval cells have fallen to the groui;d from their matrices, 

 the twigs present broad grooves, fissures, and excavations, the relative 

 length, depth, and api)earance depending entirely upon the number of 

 cells they had contained. One twig in the collection of the National 

 Museum from winch these larval cells had fallen exhibits a broad exca- 

 ^■ation over 2 inches long. 



The flattened larval cell varies considerably in shape and size, but 

 usually it is from 5 to 6 mm. long by 3 to 5 mm. in diameter. 



(raUflij. — Female. Length, 3 to 3.4 mm. Reddish brown, the an- 

 tennae, eyes, posterior tibia', metathorax, and dorsum of abdomen dark- 

 brown. Head and thorax finely punctate. Antenna' 14-jointed, pubes- 

 cent; mesonotum with three distinct grooves and anteriorly between 

 the median and lateral grooves are two short grooves, the groove on the 

 shoulders distinct. Scutellum rugose, rounded posteriorly, the foveas 

 confluent, polished. Wings hyaline, veins brownish yellow. 



Tj/pe.—No. 3069, U.S.N.M. 



Three female specimens, in poor condition, reared June 6, 1883. The 

 gall was collected somewhere in the New England States. 1 have, how- 

 ever, collected the same gall in North Carolina. 



1 ANDRICUS RILF.YI, new species. 



Gall. — A small brown globular gall, attached by a slender point to 

 the midrib of a leaf. Diameter a little over 3 mm. The shell is very 

 thin and brittle and the larval cell occupies the whole of the interior. 



Gallfly. — Female. Length, 3.2 mm. Head, antenuiie, and thorax 

 brick red, legs and abdomen pale brown, eyes dark brown, teguhxs yel- 

 lowish. Antenn;e 11-jointed, finely pubescent, more especially toward 

 tips. Head and thorax minutely' punctate. Parai)sidal grooves dis- 

 tinct, an indication of a median groove and two short median grooves 



