THE CANADIAN ENTOMOLOGIST. 183 



SOME GALL-INSECTS. 



BY T. D. A. COCKERELL, EAST LAS VEGAS, N. M. 



Cy nip idee. 



Holcaspis Arizonica, n. sp. — Gall globular, 9 mm. diam., pale 

 ochreous, not shiny, attached to the base of the petiole of a leaf of 

 Quercus Arizonica, Sargent. There is a projecting point next to the 

 place of insertion. Within, the gall is brown, fibrous, moderately dense, 

 at least dithalamous. 



Fly emerging April 19, two females. Body 3^ mm. long, wings 3^3 

 mm.; antenna? 2 mm., 15-jointed, joint 3 considerably the longest. Length 

 of joints in /x : (3.) 360, (4.) 240, (5.) 200, (15.) 170. The joints, especially 

 the apical ones, with fine longitudinal ridges, between which are rows of 

 minute punctures. Head ferruginous ; thorax and abdomen piceous ; 

 margins of mesothorax, and two spots on scutellum, dull ferruginous ; legs 

 bright ferruginous ; anterior tibia? with an apical projection ; anterior 

 tibial spurs bent ; claws of all the legs falciform, with a large triangular 

 basal tooth. Outer parapsidal grooves failing anteriorly. Scutellum a 

 large rounded hairy eminence, without grooves. Sides of thorax, and 

 abdomen except upper basal portion, with much glittering white hair. 

 Abdomen with a short ferruginous hairy projection beneath ; ovipositor 

 not visible. Naked portion of abdomen smooth and polished, hairy 

 portion minutely tessellate, with a tendency to oblique grooves, only 

 visible with a compound microscope. Wings strongly clouded on apical 

 half, nervures piceous, areolet present. 



Hab. — Prescott, Arizona, 1902. Collected by the writer. Closely 

 related to Cynips sulcatus, Ashmead, but differs by its much darker 

 colour and infuscated wings. It seems to go best in Holcaspis. 



Cecidomyi'uhc. 



Lasioptera carbonitens, n. sp. — Gall shaped something like a long 

 onion bulb, consisting of an aborted shoot of a grass not identified. The 

 gall is entirely similar to that on Brachypodium silvaticum, figured by 

 Riibsaamen in Ent. Nach., XXI. (1S95), p. 16. Fly emerged April 21. 



$ . Shining coal-black ; red patches at bases of wings ; bases of all 

 the femora, but especially the hind ones, pallid with a reddish tint ; 

 halteres pale reddish, shining ; head small ; antenna? short, 2 + 16 jointed; 

 abdomen wholly without spots ; ovipositor retractile ; wings hyaline, 

 iridescent, with black hairs and heavily-scaled black margins ; closed 

 wings reaching about to end of abdomen. Length a little over 2 mm., 

 wings 1 $4 mm. 



Bab. — Las Valles, N. M., near the Gallinas River, 1902. 



