376 Annals Entomological Society of America [Vol. IV, 



13 COMPSODRYOXENUS Ashm. 



Compsodryoxenus, Ashmead, Proc. U. S. Nat. Mus., vol. 19 (1896), p. 128. 



Head confluent!}- punctate or faintly rugose, antenna; filiform, 1.3-14 

 segmented, thorax closely and confluently punctate or faintly rugose, 

 parapsidal grooves shallow but distinct, pleura punctate, scutellum 

 rugose, abdomen compressed, ventral valve prominent, sharply pointed, 

 plowshare-shaped. Radial cell open, vein at base arcuate and sur- 

 rounded by a brown cloud, margin of basal vein clouded and a brown 

 spot before the break in the anal vein. Claws simple. Galls on Quercus. 



Compsodryoxenus brunneus Ashm. 



Compsodryoxenus brunneus, Ashmead, Proc. U. S. Nat. Mus., vol. 19 (1S96), 

 p. 129. 



"Galls. The gall of this species was likewise confused in the collec- 

 tion with a similar gall I - 1 ndricus ckrysolepidis) occurring on Q. chrys- 

 lepis in California, but I can distinguish two kinds of galls, although 

 both bear the same number (2972). Both are very much alike exter- 

 nally, but one is polythalamous, the other monothalamous, and I 

 believe the latter is the one producing the present gall-fly. 



"Gall-fly. Female. Length, 2 to 2.6 mm. Head, antennas, 

 thorax, and legs pale or light brown, the antenna; towards tips dusky, 

 pleura blackish, the abdomen black, polished, the posterior legs dusky 

 or darker than the other. Wings hyaline, marked as in previous 

 species. 



"The species is closely allied to the preceding, but it is smaller, 

 paler colored, and has 13 joints in the antennas. 



"Type No. 3085, U. S. N. M, 



"Specimens reared June !>. lss.3, (?1S93). Under this number the 

 record book contains the following: January 13, 1893, Received 

 today from Mr. H. W. Turner, of Martinez, California, a lot of elongate, 

 oval twig galls, found on scrub oak; some of them were collected January 

 3rd in Pine Canyon, Mt. Diabalo Contra Costa County, and some from 

 apparently the same species of oak at Martinez; placed galls from differ- 

 ent localities into different bottles to breed. " (W. H. Ashmead). 



I have not seen examples of this species. 



14 RHODITES Hartig. 



Cvnips (part.), Linne, Syst. Nat., ed. 10 (1758), p. 313, 553. 



Rhodites, Aylax (part.), T. Hartig, Zeits, f. Ent., vol. 2 (1840). p. 18(5, 194. 



Head large, broader than the thorax, antenna; 14-15 segmented, 

 pronotum narrow in the middle, parapsidal grooves complete or not 

 reaching anterior margin, deep longitudinal groove beneath on meso- 

 pleura. scutellum with basal foveas or a wide transverse groove, abdomen 

 smooth in female, strongly compressed apically, sternite of last segment 

 plowshare-shaped, broad at the base and gradually narrowing to a point, 

 abdomen in male small, compressed and rounded apically. Radial cell 

 closed, short. Claws simple. Galls on Rosa. 



