68 DIPLOPODA. \ 
the expansion of the first tergal plate, and the replacement of the transverse sulcus on 
the dorsum of the segments by a secondary sulcus lying in front of the pore. In this 
latter respect it resembles several of the species referred to this genus which have been 
described from the West Indies (see Journ. Linn. Soc., Zool. xxiv. pp. 499-505, 1893). 
The chief peculiarity about the phallopod is the shortness and thickness of the distal 
segment as compared with that of the other species of Rhinocricus here recorded, 
which does not exceed the length of the guard of the seminal style. A closely allied 
species has recently been made the type of a special subgenus, Eurhinocricus (cf. infra, 
p. 72, under &. diolleyi). 
The following species of Rhinocricus are known to me only from descriptions and 
figures. ‘The scobine were not examined, or at all events not described in detail, and 
only in the case of the species recorded by Brolemann have the number of sensory 
papille on the antenne been mentioned and the structure of the gonopods illustrated. 
I have found it impossible on this account to include the species in the above-printed 
analytical key. 
Only two of the species stand out as sharply distinguished from the rest, namely 
R. hagedussii of Daday and &. dugest of Bollman, which are characterized by the 
presence of a long caudal process. 
14, Rhinocricus toltecus. 
Julus toltecus, Sauss. Linn. Ent. xiii. p. 331 (1859); Mém. Soc. Phys. Genéve, xv. p. 554, fig. 27 
(1860). 
Spirobolus toltecus, Sauss. & Humb. Miss. Sci. Mex., Myr. p. 75. 
Hab. Mexico, Cordova. 
The distinguishing characteristic of this species appears to be the form of the anal 
segment, which is neither compressed nor attenuated, but is hemispherically rounded. 
The posterior border of the sternal plate is lightly convex, and that of the tergal plate 
also lightly convex, with a very short median dentiform caudal process overlying the 
compressed margins of the anal valves. 
Number of segments 63. Length 88, width 6 millim. 
In all the other species of this genus described by de Saussure and Humbert the 
posterior extremity of the body is compressed and the tergal plate of the anal segment 
is triangular dorsally. 
15. Rhinocricus aztecus. 
Julus aztecus, Sauss. Linn. Ent. xiii. p. 3831 (1859); Mém. Soc. Phys. Genéve, xv. p. 558, fig. 29 
(1860), 
Hab. Mexico, Vera Cruz, Cordova, Orizaba, &c. 
