78 DIPLOPODA. 
plates, &c, but differing in the absence of a transverse sulcus on the head and in the 
presence of strong punctures above the labrum. 
In size this species resembles S. eatmius, Porat, which also came from Guatemala; 
but the two certainly appear to differ in the shape of the lateral portion of the first 
tergal plate, which is described as anteriorly emarginate in S. eximius, and also in that 
of the second, which is inferiorly obliquely truncate in the latter species. More 
especially does S. stolli differ from S. evimius in that the coxe of the fourth to the 
seventh legs are only slightly produced. 
A single female specimen of the same or of a closely allied species (fig. 4), from Costa 
Cuca, Guatemala (0. Stoll), differs from the typical examples in having the lateral 
sulci stronger and more widely spaced. 
4, Spirobolus godmani, sp. n. (Tab. VII. figg. 1 a-e.) 
Colour ferrugineo-olivaceous ; legs and antenn red ; anterior border of the collum, posterior borders of the 
somites, and margins of valves with a narrow red band. 
Head convex, smooth, and polished ; the sulcus very feeble, with 3 or 4 labral pores on each side. Antenne 
as long as the head. yes small, composed of from about 16 to 20 ocelli. First tergal plate smooth, 
very much narrowed laterally, with the anterior and posterior borders emarginate ; a distinct groove. 
The second tergal plate infero-laterally expanded with sinuous edge, excavated below ; its posterior angle 
rounded but rectangular; the anterior angle rounded and but little produced forwards. The rest of the 
segments smooth and polished dorsally, the anterior portion, however, finely striolate transversely ; the 
lateral area of the segments behind the sulcus longitudinally striate, in front of it feebly obliquely 
striate. The transverse sulcus complete over the dorsum and well defined, the area behind it very slightly 
raised; a very feeble longitudinal sulcus marking the position of the pore behind. Anal segment very 
large (cf. measurements); the tergal plate posteriorly rounded or obtusely angled, covering but not 
surpassing the summit of the valves ; valves with their margins lightly compressed. 
3. Smaller and slenderer, with the seventh somite dilated. Coxe of the fourth legs produced into a long 
apophysis, the third, fifth, sixth, and seventh similarly but less conspicuously developed. 
Copulatory apparatus with sternal plate shallow, very feebly emarginate ; anterior lamina of coleopod produced 
inferiorly into an admedian sublinguiform process in contact with its fellow of the opposite side and 
emphasised externally at the base by a distinct semicircular notch ; the posterior lamina almost semi- 
lunar, convex internally, concave externally, the inferior angle very distinctly bifurcate, the lower process 
of the fork longer than the upper. 
Number of segments 42. Measurements of large 2 : length 87 millim. ; median width 11; width of first tergal 
plate 9°3, of anal segment 7°5. ¢ : length 62 millim., width 8. 
Hab. Mexico, Omilteme in Guerrero 8000 feet (7. H. Smith). 
This species apparently differs from all those described and figured by Saussure, 
S. tzendalus excepted, in having the posterior angle of the second segment rectangular, 
not obtuse, and from S. tzendalus it seems to be distinguished by having the antero- 
lateral border of the first tergal plate emarginate instead of straight. 
5. Spirobolus fossulifer, sp.n. (Lab. VII. figg. 2 a-e.) 
Colour (in alcohol) piceous or ochraceous ; legs and antenne of the same tint as the body. 
Head faintly transversely striolate, with 6 or 8 labral pores; the median sulcus obsolete in the middle. rst 
tergal plate with the anterior border of the lateral angle perfectly straight, the posterior border convex. 
