POLYLEPISCUS.—APHELIDESMUS. 157 
and strigose in its posterior half. Caudal process of anal segment with convex posterior border and 
angles. Legs with terminal segment covered with spiniform sete, not spines. Phallopods distally 
three-branched as in P. heterosculptus, the seminal style superior and internal, evenly curved down- 
wards, arising apart from the others which spring from a common basis and curve inwards, the inferior 
of the two grooved below and less strongly curved than the superior, the former not apically hooked as 
in P. heterosculptus. 
Length, 2, 64 millim., width 11. 
”? 3 ? 59 Bd 99 9. 
Hab. ? GUATEMALA. 
This species, the exact locality for which is unknown, is based upon specimens in the 
British Museum. It may be known from P. heterosculptus and P. actewon by its much 
smaller size and by the freedom of the polygonal areas from granulation, though the 
tubercles in number and distinctness seem to resemble those of P. heterosculptus. 
From both, again, it differs in having the pores, especially upon the 19th keels, lateral, 
and the caudal process rounded. ‘The first tergal plate has its angles considerably 
less produced than in P. heterosculptus, and this plate in the latter has a very distinct 
anterior and posterior row of tubercles as well as others scattered on its surface. The 
phallopod is somewhat like that of P. heteroscu/ptus; but the curvature of the two 
auxiliary prongs is different and the subcylindrical portion of the distal segment of this 
organ is shorter as compared with the terminal portion carrying the prongs. From 
P. stolli this new species may be at once distinguished by the presence of tubercles on 
the polygonal areas and by having the posterior angles of the keels, especially of the 
segments of the mid-region of the body, shorter and less markedly spiniform. 
4. Polylepiscus heterosculptus. 
Pachyurus heterosculptus, Carl, Rev. Suisse Zool. p. 635, t. 12. figg. 73- 75 (1902) °. 
The essential characters of the species, which is unknown to me, have been cited under the diagnoses of 
P. actewon and P. furcifer and need no recapitulation. 
Length 80-90 millim., width 13-15. 
Hab. GUATEMALA I. 
APHELIDESMUS. 
Euryurus, Humbert & Saussure, Miss. Sci. Mex., Myr. p. 151 (1872) (in part.) ; Attems, Denk. 
Akad. Wien, Ixviii. p. 277 (1900) (nec Euryurus, Koch, as restricted by Humbert and 
Saussure). 
Aphelidesmus, Brélemann, Ann. Soc. Ent. France, Ixvii. pp. 266, 322 (1898); Attems, Denk. 
Akad. Wien, Ixviii. p. 435 (1900). 
Differs principally from Amplinus and Polylepiscus in having the dorsal surface smooth, the first tergal plate 
much wider laterally, and the caudal process of the anal segment narrower, longitudinally oblong or with 
slightly converging sides ; anal sternal plate rounded as in Polylepiscus ; phallopods more complicated, the 
terminal segment showing much more distinct traces of division into femoral, tibial, and tarsal elements ; 
the auxiliary branch wide, complicated in structure, and forming a sheath enveloping the long and 
flagelliform seminal style, which is inferior to it as in Dirhabdophallus. 
Type, A. hermaphroditus, Brol. 
