OP HR YDESMUS. 
23 
In addition to the six African genera Aporodesmus, Pterodesmus, 
Lampodesmus, Gypsodesmus, Compsodesmus, and Tanydesmus there 
may be referred to this family the following from South America. 
Genus Chonodesmus, nov. 
The type is Ck. alatus (Ptrs.), one of the three specimens on which 
his Cryptodesmus alatus was founded. The remaining specimen of 
the three it is proposed to recognize provisionally as a second species 
of Chonodesmus, under the name Chonodesmus regularise sp. n. 
This differs from Ch. alatus in the more equal size and more regular 
distribution of the dorsal elevated areas, each of which bears a hair 
of considerable length. The carinae are less horizontal, so that the 
dorsum appears more convex, with the median arch less abruptly 
prominent than in Ch. alatus. The pores are located in exactly the 
same way, that is, in front of the middle of the carina, somewhat re- 
mote from the margin, opening laterad on the side of a small granule. 
There is a large series of Indian and Malayan forms referable to 
the Pterodesmidse. Mr. Pocock has already defined a few genera as 
distinct from Cryptodesmus, but the bulk of his descriptions stand 
under that name. In a small collection of Javan Diplopoda which 
came into my hands about a year ago are some specimens in all prob- 
ability at least congeneric with others which have been described from 
the East under Cryptodesmus. These Oriental Pterodesmidse have 
the dorsal tuberculation somewhat more pronounced than the African, 
and the radiating areas are less evident ; the antennae are somewhat 
more slender, and the copulatory legs are constructed on a slightly 
different plan. The pores are located at about the middle of the 
carinae, farther back than is usual in the African forms. 
Genus Pocodksmus, nov. 
The type is P. greeni (Poc.),"^ which seems generically distinct 
from Ophrydesmus in the hairy body, the short, thick antennae, the 
trituberculate preanal scale. The small size and apparently narrow 
carinae also indicate a distinct form. Whether the other Ceylon species 
is congeneric can hardly be inferred from Mr. Pocock’s description. 
In neither species is the location of the pores stated. 
Genus Ophrydesmus, nov. 
The antennae have the fifth and sixth joints greatly swollen on 
the outer side as they lie bent ; the secondary sexual characters con- 
sist in having the male legs finely hairy on the ventral surface, the 
sterna very deeply impressed both longitudianally and transversely, 
with the resulting four prominences very finely and distinctly granu- 
lar and pilose with short hairs ; on the sixth segment these sternal 
* Journ. Bombay Nat. Hist. Soc., 1892, p. 24. 
