8 PROCEEDINGS OF THE NATIONAL MUSEUM, vol.60. 



tergites are farther separated than normal instead of inclosing the 

 " terminal urites." However, Foerster's method of expressing the 

 character is awkward. A specimen of the genotype, Clistofyga inci- 

 tatoT (Fabricius), determined by Roman, has the hypopygium promi- 

 nent but not extending far beyond the apex of the abdomen and not 

 inclosed by the tergites; the claws are not pectinate, as stated by 

 Ashmead, but are strongly toothed basally; the ovipositor is up- 

 curved. The females of all the other species studied agree in all of 

 these characters. In some species the male has the lower cheek 

 deeply impressed and highly polished, the impression flanked on the 

 outer side by a high, sharp ridge. This last has been referred to by 

 Schmiedeknecht ^ and by Morley " as a generic character. 



Biological records concerning the members of this genus are con- 

 flicting. Among the specimens examined are only two such records. 

 The types of one of the new species described below are said to have 

 been reared from a "spider nest," and a male of another new species 

 labeled " Hopkins U. S. No, 13334A " is said to have been found as 

 an adult in the burrow of Calo'pus angustus LeConte in Pinus mur- 

 rayana at Yosemite National Park. Cllsto'pyga incitator (Fabricius) 

 of Europe is said by Brischke to have been reared from Retinia 

 resinana, while Morley quotes records of its having been reared 

 from " beech infested with Anol)ii and Ptilinus pectinicornis " and 

 from galls of Cynips kollari. The " spider nest " mentioned above 

 accompanied the specimens, but unfortunately whether it was an 

 Qig^ sac or the retreat on an adult spider could not be determined 

 because of its condition. It seems likely that the records associat- 

 ing species of the genus with other than spiders have resulted from 

 the place of abode of a spider host. 



The seven North American species are very readily distinguished 

 by the characters used in the following table. So fcAv males are 

 available for study that this table is based only on females, with 

 male characters given where specimens of that sex are at hand. The 

 first character used, the comparative length of hind tarsi and tibiae, 

 can not, as worded, be applied to males, the orbital character being 

 better used for that sex. 



TABLE TO SPECIES. 



1. Posterior tarsi nearly twice as long as tlieir tibiae, the latter distinctly 



shorter than their femora ; yellow orbital ring strong and extending unin- 

 terrupted to beyond top of eye 2 



Posterior tarsi not nearly twice as long as their tibiae, the latter subequal to 

 or slightly longer than their femora ; yellow orbital ring incomplete or 

 absent 3 



2. Hind and middle tibiae blackish with whitish annulus, first four joints of 



their tarsi blaclvish with white basal ring ; propodeum with a median 

 longitudinal furrow recurva (Say). 



' Opusc. Ichn., vol. 3, p. 1174. '"Brit. Ichn., vol. 3, p. 138. 



