1973] 
Shear — Rhiscosornididae 
203 
sected at that time and turned out to be immature. My interpreta- 
tion of the posterior gonopods in that paper was likewise in error; 
see above. I have examined the tiny gonopods at high magnification 
under phase contrast, but cannot determine for certain if the large 
branch on the anterior gonopod made of closely appressed cuticular 
fibers is attached to the anterior or posterior coxal process. In R. 
trinitarium (see below) this branch is definitely a part of the pos- 
terior coxal process, while when gonopods of R. acovescor are dis- 
sected, it always seems to go with the anterior coxal process. 
Rhiscosomides trinitarium n. sp. 
Fig. 18 
Type: Male holotype from Butter Creek, elev. 3450', 12 mi south- 
east of Hyampom, Trinity Co., California, collected 22 July 1968, 
by H. Leech. Deposited in California Academy of Sciences. 
Description: Male holotype; length 7.1 mm, width 1.12 mm. 
Body form as described for R. acovescor , but sixth segment slightly 
larger than seventh, collum cream-white. 
Anterior gonopods: Anterior coxal process highly complex (Fig. 
18), branches closely appressed in midline, but not fused; lateral 
branch large, blunt. Posterior coxal process with small, sharp an- 
terior branch, posterior and mesal branches fused (?), complexly 
laciniate. Telopodites bilobed. Posterior gonopods (ninth legs) 
typical. 
Female unknown. 
Distribution: Known only from the type locality. 
Notes: This species is clearly intermediate between R. acovescor 
and the more typical northern group of species. 
Literature Cited 
Chamberlin, R. V. 
1941. New southern millipeds. Bull. Univ. Utah. 32, Biol. Ser. 6 : 1-19. 
Shear, W. A. 
1972 Studies in the milliped Order Chordeumida (Diplopoda) : A re- 
vision of the Family Cleidogonidae and a reclassification of the 
Order Chordeumida in the New World. Bull. Mus. Comp. Zool. 
144(4) : 151-352. 
SlLVESTRI, F. 
1909. Descrizioni preliminari di vari artropodi, specialmente d’America. 
Rend. R. Accad. Lincei 18: 229-233. 
1913. Ulustrazione di due famiglie di Chordeumidea (Diplopoda) del 
Nord America. Boll. Lab. Zool. Portici 7: 303-310. 
