166 DIPLOPODA. 
and oval, and the seminal stile slender and but little curved. The segment that 
bears them, moreover, seems, from Attems’s figures, to be rotated in such a way that 
when viewed from the outside the seminal stile is completely concealed by lying on 
the inner side of the sheath or auxiliary ramus. The length is 53 mm., much the 
same, that is to say, as in D. granosus. ‘The dorsal surface, moreover, is granular, 
with three rows of tubercles, and the pore-area is prominent as in the other Central- 
American species. Attems unfortunately furnishes no particulars about the example 
or examples from Port Limon he determined as L. carinovatus. He does not say that 
there were males amongst them; and until information on this head is forthcoming 
suspension of judgment must be exercised as to the correctness of his determination 
of the specimens. It is, in my opinion, highly improbable that specific identity 
exists between examples from Manaos and those from Costa Rica. But whether the 
specimens from Port Limon are specifically distinct, as is indeed probable, from 
D. granosus, Carl, and D. hoffmanni, Peters, both from Costa Rica, there are no data 
to show. 
For these reasons I have omitted D. carinovatus from the table of Central-American 
species given above. 
PHYLACTOPHALLUS, gen. nov. 
Head sulcate above ; antenne elongate and slightly incrassate to the 6th segment, the segments from the 
second to the sixth subequal in length. Body narrow, wider in front than behind, but even in front 
barely wider than the head; Ist tergal plate as wide as the 2nd; anterior keels moderately well 
developed, high and nearly horizontal, becoming gradually smaller in the middle and posterior portion 
of the body; the metazonites with a distinct but not deep transverse sulcus beginning on the 4th or 
Sth segments. Pores normal. Caudal process triangular, truncate, and anal sternal plate triangular. 
Legs with sixth segment very short, shorter than fifth, which sends forwards a process beneath its 
_ proximal end. Phallopods stout, apically blunt, and hooked, with a minute superior spiniform process 
and an external laminate sclerite. 
Type, P. stenomerus. 
Distribution. Central America (Costa Rica). 
1. Phylactophallus stenomerus, sp. n. (Tab. XIII. figg. 3-3h.) 
Colour blackish, with the keels, the posterior border of the terga, the legs, and antennz pale. Head sulcate 
above, rugulose. Antenne moderately long, a little incrassate, the second and third segments subequal 
and slightly longer than the fourth, fifth, and sixth, which progressively decrease in length, the second 
as long as the sixth and seventh together. Body narrow, parallel-sided, rugulose above. The 1st tergal 
plate narrower than the head, nearly semicircular, convex above, its antero-lateral border evenly rounded 
forwards from the angles of the keels, which are a little acute ; the posterior border mesially emarginate. 
Dorsal surface of the rest of the segments convex above, the keels not much above the middle of the 
sides and all small; the anterior and lateral borders of the majority forming a very obtusely rounded 
angle ; the lateral margin evenly thickened, especially on the pore-bearing segments ; the pores looking 
laterally ; posterior angles of the keels acute, subspiniform, and a little produced backwards, becoming 
more and more spiniform and produced on the posterior segments. Keels of 2nd and 3rd segments 
directed a little forwards, especially those of the 2nd, in which the anterior angle is squared ; anterior 
angles of 3rd, 4th, 5th, 6th, and 7th, &c. becoming gradually more and more convex; a minute 
antero-lateral tooth traceable on some of the anterior keels. The dorsal surface coriaceous, with 
a distinct sinuous sulcus on the 5th to the 15th metazonites. Caudal process conical, truncated ;_ 
