1910] Diplopoda from the Western States 257 



Eye area large, subtriangular, the dorso-mesal and ventro-lateral 

 sides convex and the ventro-mesal nearly straight. Ocelli arranged in 

 -eight straight transverse rows which, counting from above ventrad, are 

 as follows: 8, 10, 9, 8, 7, 6, 5, 3, making a total of 56. 



Antennae slender, a little enlarged distally, the sixth article thick- 

 est. Clothed with short hairs intermixed with longer ones, the hair 

 more dense distally. 



First legs of male thickened, but as yet straight and not distally 

 hamate. Coxae fused in middle line. See PI. XLI, fig. 8, and PI. 

 XLII, fig. 2. 



Second legs not as yet reduced, as large as the third but the four 

 distal articles forming a hook which seems firm and is directed cephalad. 

 Claw large. 



Lower margin of seventh segment but slightly angularly extended. 

 'Gonopods enclosed in a single sheath, the body being very long and pre- 

 senting indications of the separate pieces only distally. See PI. XLI, 

 figs. 5 and 6. Upon removal of the envelope the copulatory organs 

 are revealed in their usual character and relations, but the posterior 

 pair not yet engaged distally with the inner branches of the anterior 

 pair as in the adult furcifer, its two prongs being straight and closely 

 appressed together and the outer one distally pilose. Outer branch 

 of anterior pair provided with long hairs as in the adult furcifer. 



Number of segments 58. 



Locality— Portland, Oregon (1902). 



The description above is of a male which as indicated pre- 

 viously, is not wholly mature, although apparently or probably 

 within one moult of being so. While the copulatory organs 

 when released from the peculiar sheath are seen to be fully 

 formed and in most respects in close agreement with those of 

 typical furcifer, the coloration is markedly different from that 

 usually found in P. furcifer of the corresponding age. Further- 

 more, an adult female collected at the same time has precisely 

 the same coloration and differs from furcifer. It has seemed 

 best to designate the form for the present at least, therefore, 

 as a distinct variety. Because of the interesting points pre- 

 sented the young male is described in full and illustrations of a 

 number of its features presented. 



FAMILY PAEROMOPIDAE. 



Paeromopus lysiopetalinus Karsch. 

 Figures of this interesting forrri, so long obscure as to its 

 affinities because of incompleteness of the original description 

 and lack of specimens in collections, are presented in Plate XLII, 

 iigs. 3 to 5, and in Plate XLIII, figs. 1 to 3. The author has speci- 

 mens of this form from Portland, Oregon, and from Pacific 

 Grove and Stanford, California. 



