88 DIPLOPODA. 
tarsi and distinct claws; tarsus of third to seventh pairs of legs inflated, with minute claw; protarsus of 
third leg with distinct papilla (Tab. VII. fig.8d). Anterior lamina (proximal segment) of coleopod with 
its inferior edge produced internally into a longish bluntly-rounded process, projecting in front of the 
inner processes of the posterior lamina (distal segment) (Tab. VII. fig. 8a). For other details of copu- 
latory apparatus, see Tab. VII. figg. 8 4, c. 
Number of segments about 40. Length of 9 about 30 millim., width about 2°5 millim. 
Hab. Guatemata, Tecpam (Dr. O. Stoll). 
This species and the following differ in many structural characters from S. richard- 
soni, and will probably be considered as generically distinct. The principal differences 
are enumerated in the analytical table. 
3. Spirobolellus atriculus, sp.n. (Tab. VII. figg. 9 a-c.) 
gd. Closely resembling the preceding in colour, size, and most other characters, but easily distinguished by 
sexual characters. The tarsi and protarsi of the anterior legs are unmodified (Tab. VII. fig. 9 c) and the 
anterior lamina (proximal segment) of the coleopod is not produced inferiorly on the inner side into a 
distinct process, so that the inner processes of the posterior lamine are visible from the anterior aspect 
(Tab. VII. figg. 9 a, 6). 
Hab, GuatEMALA, Volcan de Agua (Dr. O. Stoll). 
The following species appears to belong to this genus :— 
4, Spirobolellus nahuus. 
Spirobolus nahuus, Sauss. et Humb. Rev. et Mag. Zool. 1869, p. 154; Miss. Sci. Mex., Myr. pp. 86, 
177, t. 4. fig. 21 (1872). 
Blackish. Head with 3+3 labral pores ; antenne short. First tergal plate with its lateral portion triangu- 
larly truncate, the anterior border defined by a sulcus and slightly sinuous, not extending quite so far 
inferiorly as the second. Remaining seyments with the posterior portion smooth and separated from the 
median portion by a punctured groove; the inferior strie moderately strong; pores in the middle of the 
posterior portion, marked with deep punctures. Anal segment with tergal plate obtusely angular, not 
surpassing the valves; margin of valves not compressed; sternal plate scarcely angular. 
Male smaller than female, with coxe of third, fourth, and fifth legs bearing a small protuberance. 
Number of segments 35 in 9, 32-37in ¢. Length of 9 23, of ¢ 16 millim. 
Hab, Mexico, Sierra de Moyoapan, in the Eastern Cordillera. . 
This species seems to be closely allied both to & tylopus and S. atriculus. It 
appears, however, to be a much smaller animal, but without definite information as to 
the structure cf the copulatory apparatus further comparison is impossible. 
