168 DIPLOPODA. 
1. Cyclorhabdus contortus. 
Cyclorhabdus contortus, Brédlemann, Mém. Soc. Zool. France, xiii. p. 98, t. 6. figg. 21-25 (1900) * ; 
Bull. Soc. Zool. France, xxix. p. 189 (1904) *. 
Leptodesmus contortus, Carl, Rev. Suisse Zool. x. p. 607, t. 10. figg. 28-31 (1902) *. 
Colour greyish-brown with the swollen area of the keels pale yellow and a pale round spot in the middle of 
the dorsal area of the segment; antenne and legs pale ochre. Dorsal surface of the segments coriaceous ; 
area beneath the keels granular. Head smooth. Antenne tolerably long and slender. J irst dorsal 
plate as wide as the head, with angles rounded and feebly concave posteriorly. eels of 2nd, 3rd, 
and 4th segments subrectangular, a little depressed anteriorly; a minute tooth on the anterior angle 
of the 2nd. Upon the following segments the keels are reduced to a slender rounded ledge, which, 
however, is much dilated upon the segments carrying the pores; pores small and opening laterally ; 
groove between the two portions of the segment wide and longitudinally canaliculate. Caudal process of 
20th segment conical, with round slightly down-bent tip. Legs moderately long, the two basal segments 
studded externally (above) with spiniform tubercles; the penultimate segment produced inferiorly and 
distally beneath the proximal end of the terminal segment, which is short. Phallopods with basal 
portion (femoral area) of distal segment short, subcylindrical, and internally hairy ; distal portion with 
an external spiniform process near the base, the rest of the segment stout with its distal half bent 
strongly upwards and outwards, ending in two processes—a slender seminal stile and a broader, more 
rounded, subsidiary process. Sternum of the 5th with two short, wide, flattish processes between the 
legs of the first pair and also a tubercle at the base of the cox of those of the second pair. 
Length, 9, 25 millim., width 3°40. 
” 3, 20 ” ” 2°20. 
Hab. Guatemara!3 (Rodriguez). 
This genus and species are known to me only from the description and figures. 
EUTYPORHACHIS, gen. nov. 
Distinguishable in hoth sexes from Dirhabdophallus by the presence of a deep transverse sulcus on the dorsal 
area of the metazonites, the area behind the sulcus ornamented with two rows of flat tessellated or 
tubercular areas. Fifth segment of legs much longer than the fourth and only a little shorter than the 
sixth. Phallopods otherwise formed. 
Type, £. tessellatus. 
Distribution. Guatemala. 
Forms related to the type-species of this genus have been referred by myself and 
Attems to Odontopeltis (cf. supra, p.161). Now the name Odontopeltis was proposed as 
a substitute for Rhacophorus, Koch; therefore the type-species of Odontopeltis must be 
the same as that of Rhacophorus, a point which has not yet been settled, for it will 
be noticed that Silvestri in his analytical key to the genera of Polydesmide cited a 
type-species for all the genera save Odontopeltis. 
Of the two forms referred by Koch to Rhacophorus, I select R. conspersus, Perty, 
as the type. The specific name conspersus was given to a Polydesmoid from Brazil 
measuring over 80 mm. in length, with wide keels in which the posterior angle from 
the fifth segment onwards is acutely produced and directed more and more back- 
wards towards the posterior end of the body, the anterior border being lightly convex 
and the posterior lightly concave or straight and with the anterior angle armed 
externally with a strong, sharp, but short tooth, defined posteriorly by a conspicuous 
