66 DIPLOPODA. 
Anal segment: tergite with elongate somewhat pointed caudal process slightly surpassing the summit of the 
valves, which are strongly compressed in their upper half; sternite large and triangular. 
Copulatory apparatus and phallopods as shown in Tab. VI. fig. 9 d. 
Number of segments and measurements doubtful (specimen fragmentary). 
Hab. Guatemata, Retalhuleu (0. Stol/). 
This species is remarkable for the large size of the scobine and. for their extension 
on to the penultimate segment. In the deepness and dorsal completeness of the 
transverse sulcus and the coarse coriaceous sculpturing of the terga it much resembles 
R. salleanus ; but, apart from the scobine, differs from that species in having the first 
tergal plate much wider laterally and the inferior horizontal area of the second very 
distinctly longer. The caudal process also overlaps the summit of the valves. 
11. Rhinocricus olivaceus, Newp. (Tab. VI. fig. 10.) 
Spirobolus olivaceus, Newport, Ann. & Mag. Nat. Hist. xiii. p. 268. 
Julus olivaceus, Gervais, Ins. Apt. iv. p. 184 (1847); Voyage de Castelnau, p. 20. 
@. Colour (dry specimen) deep olive-yellow ; posterior border of segments ferruginous; legs and antenne 
dark. 
Head feebly striolate transversely and punctulated. Antenne long, a little longer than the head, with the 
sixth segment a little shorter and narrower than the fifth. Hyes composed of about 30 ocelli in 5 rows. 
First tergite not evenly rounded, somewhat angular (perhaps shrivelled from drying). All the 
segments dorsally striolate; the transverse sulcus strong and complete dorsally even on the second 
segment; the lateral strive on the posterior portion of the segments extending up to the pore; median 
area of segments laterally pitted and irregularly grooved transversely above; a conspicuous longitudinal 
sulcus in front of the pore and also behind it on the posterior portion of the body. Scobine but little 
differentiated, consisting of a transverse groove the ends of which are not turned inwards towards each 
other to form a crescent-shaped mark, but outwards parallel to the edge of the terga; behind the 
groove there are a number of coarse strize which follow its curvature. Anal segment with caudal process 
narrowed and surpassing summit of valves; valves marginally compressed, with convexly produced edge. 
Legs longish. 
Number of segments 42. 
Length 170 millim.; median width 15, extreme width 12, 
Hab. Mexico, Oaxaca. 
A single dried typical example in the collection of the British Museum. 
At. olivaceus may be easily distinguished from the rest of the Central-American 
members of this genus, as well as from all other species known to me, by the 
undifferentiated condition of the scobinee. So far as this organ is concerned, the 
species is of considerable interest as showing the process of formation of the scobinze 
from normal transverse integumental grooves, 
12, Rhinocricus marci, sp.n. (Tab. VI. fig. 11.) 
. Colour (in alcohol) olive-green, with the posterior portion of the segments ferruginous; first tergal plate 
bordered with ferruginous ; anal tergite and valves olive-green, not bordered ; head olivaceous ; antenne 
olive-green, ringed with ferruginous ; legs olive-yellow, perhaps dark green and ringed with ferruginous 
when fresh, 
