100 DIPLOPODA. 
..and shagreened. Anal teryal plate short, obtusely angled, not overlapping the valves, the edges of which 
are prominent; sternal plate with posterior border obtuse. 
Number of segments 72 ¢, 75 Q. 
Length up to 133 millim., width &. 
Hab. Mexico, Vera Cruz, Orizaba !~+, 
It is very doubtful if the specimen from the temperate parts of Mexico, doubtfully 
referred by de Saussure and Humbert to 0. montezume in 1572, belonged in reality 
to that species. Amongst other differences that were pointed out, it may be noticed 
that it had only 64 segments. 
It is also, I think, open to doubt whether the specimen identified by Voges as 
O. montezume was correctly named. This author gives a good figure of the copulatory 
apparatus, which seems to show that the species examined, whatever its name, 
differs from all the other Central-American forms here enumerated. His figure 
shows that the distal portion of the posterior lamina of the coleopod was expanded, 
antero-posteriorly compressed, with evenly rounded inferior edge and angles as in 
O. cordovanius, with a very similar external spiniform process; but this process instead 
of projecting at right angles to the long axis of the lamina as in Q. cordovanus projects 
upwards and slightly outwards. 
Since de Saussure says nothing about the presence or absence of the pores of the 
fifth segment in this species, it is impossible to guess at its place in the first of the two 
analytical keys given above. But his description of the ridges on the anterior tergal 
plates suggests that O. montezume may resemble O. typotopyge, O. chiriquensis, and 
O. teapensis in this particular. | 
9. Orthoporus otomitus. 
Julus otomitus, Sauss. Linn. Ent. xiii. p. 330 (1859) '; Mém. Soc. Phys. Genéve, xv. p. 374, t. 6. 
fig. 40 (1860)?; Gervais, Voy. de ‘ Castelnau,’ Myr. et Scorp. p. 24°. 
Spirostreptus otomitus, Sauss. & Humb. Miss. Sci. Mex., Myr. p. 69, t. 3. fig. 1 (1872) *. 
Closely allied to O. montezuma, but with the antenne much shorter, not reaching beyond the third segment 
of the body and compressed. 
Head smooth inferiorly. First teryal plate with its inferior portion a little incurved (se repliant presque en 
dessous), bearing three or four strong folds or ridges separated by deep grooves, the anterior angle 
obtuse, the margin not concave just above it; posterior angle less widely rounded than in O. montezume, 
judging from the figures. Segments punctured and striolate; the lateral longitudinal sulci less strong 
than in O. montezume. Anal tergal plate more obtuse posteriorly and the valves less compressed. 
Number of segments 55-59. 
Length not given, but said to be less than that of O. montezume. 
Hab. Mexico, Cordova, Vera Cruz, San Andres Tuxtla 1~*. 
This species was based upon female specimens, adult and immature. 
The figures and description supply so many characters by which O. otomitus may be 
distinguished from O. montezume that there seem to be no good reasons for adopting 
the suggestion made by de Saussure and Humbert in 1872 that the former was based 
