ORTHOPORUS. 99 
Anterior lamina of coleopod somewhat short ; posterior lamina widely rounded inferiorly, with a short tooth- 
like process projecting at right angles to its longitudinal axis. 
Number of segments 49. 
~ Length about 50 millim., width about 4 millim. or a little over. 
IIub. Mexico, Cordova (Mus. Brit.). 
A single typical example in the British Museum, received in 1861. 
One of the localities given for de Saussure’s Spirostreptus otomitus was Cordova. 
This fact suggests that at all events some of the specimens he described under that 
name may have belonged to the same species as the type of O. cordovanus; but there 
can be no certainty on this point. 
7. Orthoporus striatulus, sp.n. (Tab. VIII. fig. 1.) 
3. Colour (in alcohol) a tolerably uniform brown; antenne and legs yellow-brown. 
Head and first tergal plate smooth. Inferior portion of the first plate not noticeably incurved, marked by 
four ridges separated by wide grooves; posterior angle obtusely rounded ; anterior angle slightly obtuse. 
Inferior edge of exposed segment of mandible with its posterior angle somewhat strongly produced and 
widely rounded. Pores beginning on the sixth segment. Exposed area of median portion of segments 
finely punctulated and sharply defined from the posterior area, which is covered with a coarse sculpturing 
of anastomosing ridges separated by finely punctured grooves, the lateral strive almost losing themselves 
dorsally in the sculpturing. Anal valves compressed; anal sternite obtusely rounded. Anterior lamina 
of coleopod elongate ; posterior lamina inferiorly angular and produced externally into a long attenuate 
spiniform process. 
Number of segments 61. 
Length about 50 millim. or less, width about 4. 
Hab. Mexico, Tuxtla. 
A single male specimen in the British Museum, received in 1861. 
‘The only other member of this genus previously recorded from Tuxtla is O. otomitus, 
Sauss. (cf. infra), which, however, appears to differ from O. striatudus very decidedly 
in the less coarse sculpturing of the segments. | 
There are several places named “ 'Tuxtla” in Mexico, so that the two species may 
be from different localities. . 
The following species are known to me only from figures and descriptions :— 
8. Orthoporus montezume. 
Julus montezume, Sauss. Linn. Ent. xiii. p. 380 (1859) * ; id. Mém. Soc. Phys. Genéve, xv. p. 372, 
t. 6. fig. 39 (1860) ? ; Gervais, Voy. de ‘Castelnau,’ Myr. et Scorp. p. 24°. 
? Spirostrepius montezume, Sauss. & Humb. Miss. Sci. Mex., Myr. p. 69 (1872) *. 
? Spirostreptus montezume, Voges, Zeitschr. wiss. Zool. xxxi. t. 18. fig. 33 (1878) (fig. only) °. 
Colour (dried) yellow, banded with brown, probably blackish when alive. Body very long and slender. 
Head rugulose inferiorly. Antenne long and slender in both sexes, not compressed, reaching to the fifth or 
sixth segment of the body. First tergal plate marked laterally with three large oblique ridges and some 
very short grooves behind, the anterior border lightly emarginate above the anterior angle, which is almost 
rectangular; the posterior angle rounded. Ridges on the anterior segments strongly pronounced, but 
becoming gradually weaker and weaker posteriorly. Transverse sulci well marked. Segments punctured 
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