Kinsey: Studies of Cyni/pidse 



131 



TYPES.— 31 females, and galls. In the U.S. National Museum and 

 in Gillette's collection. From Manitou, Colorado; May 8, 1892; C. P. 

 Gillette collector. 



The above redescription is based on a type female, and 

 upon galls and poor adult material I collected at Manitou. 



Gillette recorded the adult emerging on May 10, 1892. My 

 galls were collected on April 24, 1920 ; they contained mature 

 larvse at the time, and these even pupated, but not a single 

 adult matured to emerge. This was probably caused by the 

 naturally corky nature of the galls, and their soaked condition 

 after a season of much snow and rain, allowing too much 

 shrivelling after collection. It is notable that the inquiline 

 cynipids from these same galls did complete their meta- 

 morphosis. The galls are very abundant on the white oaks of 

 the region. They are often partly destroyed by birds or mice. 



This variety is closely related to piceoderma. It is differ- 

 ent in having more black and in having distinctly smaller 

 fovese. As with other Cynipidse, the varieties of Manitou and 

 of Glenwood Springs are not the same. 



Plagiotrichiis frequens variety piceoderma, new variety 



FEMALE. — Shows the following characters in addition to those 

 common to the other variety of the species: Color mostly dark rufous 

 on the head and mesonotum, the rest of the body mostly piceous black; 

 antennae rufous brown, brown terminally, bright rufous basally; meso- 

 pleurae rufo-piceous to piceous or black, less often in small part bright 

 rufous; foveae rather large, distinct, black, somewhat smooth but more oi 

 less sculptured at bottom; abdomen dark rufo-piceous to piceous black, 

 more rufous latero-basally ; legs rather dark rufous, coxse basally and 

 tibiae and tarsi darker, the middle and hind tibiae dark brown; length 

 2.0.-3.0 mm. 



GALL. — Quite identical with the gall of the other variety. 



RANGE. — Colorado: Glenwood Springs. Probably confined to a 

 limited area in Colorado on the west of the Continental Divide. 



TYPES. — 166 females, 70 galls. Holotype female, paratype females, 

 and g-alls at The American Museum of Natural History; paratype fe- 

 males and galls at the U.S. National Museum, Stanford University, the 

 Museum of Comparative Zoology, the Philadelphia Academy, and with 

 -the author. Labelled Glenwood Springs, Colorado; April 22, 1920; Kin- 

 sey collector. 



On April 22, 1920, the galls at Glenwood Springs con- 

 tained large larvse; the adult insects emerged at some later 

 date. The galls, as with galls of variety frequens, were quite 

 soaked, soft, and rubbery, with the inside tissue stained brown 



