62 DIPLOPODA., 
2. Rhinocricus aurocinctus, sp.n. (Tab. VI. figg. 1 a-h.) 
Colour (in alcohol) of posterior area of segments yellow or red, anterior area also yellow or red, intermediate 
area deep olive-green, hence, when extended, the body appears to be narrowly banded with yellowish- 
red, when coiled to be broadly banded with that colour on account of the exposure of the yellow of the 
anterior area of the segments ; first segment completely encircled with yellowish-red; anal segment deep 
olive-green, except the tip of the caudal prolongation which is yellow; antennz and legs fusco-olivaceous, 
obscurely banded with yellow. 
Head smooth. Antenne much shorter than head, thinner, slightly attenuate; sixth segment slightly longer 
than wide, narrower than fifth; seventh small. First tergite evenly rounded laterally, without any 
emargination above the eye. Infero-lateral edge of second nearly horizontal, thickened in front of the 
sulcus. The remaining segments smooth above or weakly punctulated ; the transverse sulcus very strongly 
developed and conspicuously pitted in the anterior half of the body, complete but less strongly pitted over 
the dorsum of all the segments except the second, sometimes the third and the penultimate. Scobine 
strongly developed, extending from about the ninth to about the fortieth segment, and on the segments of 
the mid-region of the body consisting of a pair of semicircular depressions, with the floor of the depression 
slightly raised, and succeeded by a triangular striated area ; space between the depressions, which are close 
to the border of the terga, less than twice the transverse diameter of either. At the posterior end of the 
body the scobine are smaller and wider apart. Anal segment: tergite produced into a narrow caudal process 
overlapping the summit of the valves, the margins of which are much less prominently convex than in 
R. rogersit, while their edges are defined by a much stronger groove; anal sternite rectangularly pointed. 
Copulatory organs and phallopods of male as in Tab. VI. figg. 1g, h. Number of segments 59-60. 
Length of 2 110 millim., width 10-5, anterior width 8; length of ¢ 81, width 7°5 millim. 
Hab. Mexico, Milpas in Durango (Forrer). 
3. Rhinocricus stolli, sp. n. (Tab. VI. fig. 2.) 
Colour olive-green, with a narrow darker transverse line along the posterior border of the terga; anterior 
portion yellow. 
Head smooth. Antenne shorter than head, scarcely attenuate, sixth segment almost as wide as fifth; seventh 
small, First tergite widely rounded. Infero-lateral edge of second segment horizontal, long, thickened 
in front. Remaining segments smooth and polished ; anterior portion very finely striolate. Transverse 
sulcus absent on second segment, obsolete dorsally on the third and on the penultimate and antepenultimate, 
complete on the others. Scobine extending from about the ninth segment to the fifth from the posterior 
end, consisting of a pair of suboval grooves, well behind the border of the terga, from about four to six 
diameters apart; striolate area considerably wider and longer than the oval impression. A longitudinal 
groove behind the fovea on the posterior half of the body. Anal segment : tergite with a transverse 
dorsal groove, the caudal process elongate but not surpassing the summit of the valves, which are 
compressed and have strongly convex, prominent borders; sternite rectangularly triangular, large, with a 
transverse groove in its anterior half. 
Number of segments 48. 
Length 106 millim. ; width of median segment 12, of anterior tergite 10, of penultimate tergite 7. 
~ Hab. Guatemara, Cholhuitz (0. Stoll). 
-This species is chiefly remarkable for the small size of the elliptical area of the 
scobine as compared with the striate area, and by the relatively great length of the 
space between them and the anterior edge of the segments. ‘The edges of the anal 
valves are also more prominent and convex than in the other species. 
4. Rhinocricus smithi, sp. pn. (Tab. VI. figg. 3 aS.) 
Colour uniform olivaceous or brunneo-olivaceous throughout. 
Antenne shorter than head; sixth segment shorter and narrower than fifth; seventh segment small. First 
