674 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



large spine near the apex. Cerci of the adult male (fig. 17) differing 

 from all other described species except tuherculatus in being slightly 

 compressed basally and unsegmented to near the tip, where it is bent 

 slightly inward and latero-apically depressed, from this depression 

 arising a distinctly segmented terminal tapermg projection consisting 

 of about four segments ; on the inner surface of the slightly inwardly 

 inclined circus proper, at the apex opposite the depression from which 

 the segmented apical portion arises, there is an oval elevated area 

 covered with short pile; the cerci of the immature male are less flat- 

 tened than in the adult, distinctly segmented 

 only toward the apex and with a slight 

 shoulder at the point where the extreme modi- 

 fication in the adult is located ; in the female 

 the cerci are simple, cylindrical, and tapering, 

 distinctly segmented apically. Ovipositor 

 heavy, somewhat longer than the pronotum, 

 the inner valves triangularly serrate apically 

 beneath. 

 Fig. 17.— pristoceuthophilus Color brown with more or less obscure mot- 

 cERCALis. Cerci OF ADULT MALE tlings of lighter color; ovipositor uniformly 



reddish brown. 

 Length, pronotum, male and female, 3 mm.; fore femora, male and 

 female, 4 mm.; hind femora, male, 8.5 mm., female, 9 mm.; ovi- 

 positor, 5 mm. 



Holotype male.— Yellow Bay, Flat Head Lake, Montana, August 18, 

 1913, Charles C.Adams, collector; allotype, same data as holotype; 

 paratype a, male, h, c, females, same locality as type but date August 

 10; d, e, males, Momit Ramier, Washington, August 22, 1910, at Long 

 Mu-e's Sprmgs, elevation 7,200 feet; /, male, g, h, i, j, 7c, I, m, females, 

 Mount Hood, Oregon, August 18-20, 1910, Cloud Cap trail, altitude, 

 6,000-7,000 feet, Hebard collector; n, male, o, p, female, Ashford, 

 Oregon, August, 1906, Dyar and Caudell collectors. 

 The above material is distributed as follows: 



Holotype, allotype and paratypes c, e, I, m, n, o, p in United 

 States National Museum, Cat. No. 18379; a, h in collection of the 

 University of Illinois; d,f, g, li, i, j, l in collection of Morgan Hebard 

 in Philadelphia. 



The paratypic material shows little variation in structure but con- 

 siderable in size, the largest specimens having a pronotal measure- 

 ment of 3.75 mm. in the male and 4.5 mm. in the female, while the 

 posterior femora measure 9 mm. in length in the male and 11.5 in the 

 female. 



Regardmg paratypes/ to m, from Mount Hood, Oregon, Mr. Hebard, 

 the collector, WTitos as follows: 



In heavy conifer forest 5,300 feet, under stones and bark, many nympha but adults 

 scarce. 



