rnocEEDiyos of the national muse cm. 127 



Described from a single specimen, labeled simply: "Black-jack oak, 

 issued November 10, 1868." 



Tlie anf>ulated outer vein of the areolet in this species at once sepa- 

 rates it from all the otliers. 



25. HOLCASPIS TRUCKEENSIS, new species. 



G<(II. — A\i irregular, inflated, hard, woody gall, over an inch long 

 and about half an inch in diameter, issuing from a slit in a terminal 

 twig of (^>Hcrci(,s chri/.soJejns var. racciiiifolia ; i)olythalanK)us. 



Gallfly. — Female. Lengtli, ?»A mm. This species in color and size 

 closely resembles N. Jicigera, Ashmead, but differs as follows: Tlie 

 14-jointe<l antenna', except the first two joints, i)leura, and metathorax 

 blackish, shining; the rest of the insect — except the dorsum of the sec- 

 ond abdominal segment, which is obfuscated — brownish yellow; the 

 head and thorax punctate, and covered with a glittering wliite pubes- 

 cence. Abdomen highly polished, bare, except the sides of second 

 segment basally; spine of ventral valve short, stout, hairy. Wings 

 hyaline, veins brown, areolet distinct, cubital cell open at base, while 

 the basal vein of radial cell is only obtusely angular. 



Type.—^^). 3080, U.S.N.M. 



Two specimens, reared December G, 1880, from galls collected b}^ Prof. 

 J. II. Comstock, in California, October IG, 1880. 



2ti. HOLCASPIS DOUGLASII, new species. 



(idU. — The construction of this gall is on the same ])rinciple as the 

 other Holcaspian galls, but instead of being globular it resembles a 

 diminutive squash, the ridges surrounding the margin being prolonged 

 into irregular tubercles, usually from 7 to 10 in number. 



GaUfiy. — Female. Length, 2.0 to 3 mm, Eeddish brown, pubescent, 

 the anterior short median grooves of mesonotum and the groove on 

 the shoulders being on a black surface. Antenna' 11-jointed, slightly, 

 gradually incrassated toward tips and apically dusky. 



Head and thorax punctate; parapsidal grooves delicate, but distinct 

 throughout; two short median grooves anteriorly and a groove on the 

 shoulders distinct; fovea' at base of scutellum confluent, not separated 

 by a carina; pleura shining, but punctate. 



Wings hyaline, pubescent, the veins blackish, the radius slightly 

 incrassated at tip, and the vein at base of radial cell angulated. There 

 is a discolored streak below the areolet, and a large brownish mark 

 below the middle of the radius in the apical cell. 



In some specimens the tibiae and tarsi are dark brown and two 

 specimens have the abdomen nearly black. 



Type.—^o. 3081, U.S.K.M. 



Seven specimens, received from Mr. Albert Koebele, collected in 

 Marin County, California, and reared December 10, 21, 24, 1895. The 

 gall occurs on the lower side on the leaves of Q. dotuilanii. 



