28 
C YR TODESMIDA£. 
Family CYRTODESMID^ Cook, 1896. 
Brandtia, p. 7. 
Types of Cyrtodesmus veluiinus and C, granosus are in the British 
Museum. The latter species differs from the former in having the 
second segment much larger, the surface not velvety nor hairy at all, 
but beset with coarse granules ; anal valves entirely plane. It is 
proposed to separate this from Cyrtodesmus under the name Oncodes- 
mus granosus (Gerv.) Cyrtodesmus asper Ptrs. in the Berlin Museum 
appears to be more nearly related to C. velutinus. 
Family ONISCODKSMID^ Saussure, i860. 
The type of Oniscodesmus is also in the British Museum. It bears 
a very evident relationship to the Pterodesmidae. Oiiiscodesmus rubri- 
ceps Ptrs., in the Berlin Museum, differs in being more convex, and in 
having the pores borne on distinct and prominent tubercles. It ap- 
pears to be the type of a new genus and may take the name Lignydes^ 
mus 7ub7iceps (Ptrs.). For Oniscodesmus auraniiacus Ptrs. the name 
Detodesmus is proposed. It differs from both Oniscodesmus and 
Lignydesmus in the narrow areolate border of the segments ; from 
Eignydesmus it is further distinct in wanting a poriferous tubercle, 
and from Oniscodesmus in the broad sinus of the nineteenth segment 
and the larger last segment. Detodesmus aurantiaeus is light-colored 
and has the surface of the segments smooth and clean, while in the 
other genera they are covered with a black, soot-like powder. 
Family CYCLODESMID^ Silvestri, 1895. 
Ann. Mus. Civ. Genova (2) XIV, p, 747. 
As recently pointed out, this family if used as proposed by Sig. 
Silvestri is a synonym of the preceding. However, it does not ap- 
pear that the relationship of Cyclodesmus with Oniscodesmus is at 
all close, and it is probably better to retain both families. 
From a “small damp cave, Mandeville, Jamaica,” come several 
specimens considerably more robust than C, porcellayius Poc., and 
without the notch in the posterior margin of the segments. These 
it is proposed to name C. hubbardii, for Mr. H. G. Hubbard of the U. 
S. Dept, of Agriculture, who collected this and other interesting 
species of Diplopoda in Jamaica and Florida. The largest specimen 
of Cyclodesmus hubbardii 10 mm. by 2 mm. The 
surface of the segments is smooth and shining, but does not become 
white even when dried. On comparing the specimens with the types 
of porcellanus it appeared that the exoskeleton was more fragile, 
possibly owing to the subterranean habits of this species. 
Junk 10, 1896. 
