LITHOBIUS. 7 
d. Fourteenth pair of legs with the tibia enormously swollen and rounded internally and beneath, deeply and 
widely excavated above and hairy, with a tuft of hairs on the middle of the inner (posterior) edge of the 
excavation ; anal legs with the tibia also swollen, but less swollen than in the fourteenth pair, distally 
excavated above, the excavation bearing an elongate superiorly flattened nodule. 
Q. Fourteenth and fifteenth legs normally formed; generative forceps with a stout undivided claw; two 
basal spurs, of which the external is longer and stouter than the internal. 
Length up to 19 millim. 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
The male of this species may be at once separated from that of LZ. pontifea and 
L. humberti by the fact that the tibie of the fourteenth and fifteenth legs are 
enormously swollen, whereas in these others the fourteenth legs are normally consti- 
tuted, and in the anal leg the tibia and proximal tarsal segment are enlarged. Again, 
in the female the claw of the generative forceps is stouter, shorter, and has no tooth at 
its base; whereas in L. humberti the claw is longer, more slender, and has a distinct 
tooth at its base. | 
5. Lithobius salvini, sp.n. (Tab. I. figg. 7, 7 ad.) 
Colour ochraceous or castaneous, darker anteriorly ; legs and ventral surface paler; antenne dark. 
Body robust, attenuated posteriorly, shining. 
Head a little wider than long, lightly convex, smooth, shining, not or very obscurely punctured, the frontal 
plate deeply furrowed longitudinally, with raised margin. 
Eyes composed of 9 ocelli,1+1, 3,4; the posterior and superior eyes subequal in size and larger than the rest. 
Antenne long, more than half the length of the body, attenuate, composed of from 48 to 56 hairy, subcylindrical 
segments; less hairy at the base; apical segment varying in length, but always longer, but not thicker, 
than the segment that precedes it. 
Coxal plate of maxillipedes sparsely hairy, mesially longitudinally sulcate, the anterior border nearly straight, 
and bearing 3+3 strong, sharp teeth, whereof the external is more slender, somewhat spiniform, and 
often absent. 
Tergites not manifestly punctured; with the exception of the first, wrinkled, sparsely hairy, and roughened, 
more wrinkled and roughened towards the hinder end of the body: the first, second, third, fourth, and 
fitth, and often the sixth, with rounded angles and straight posterior border (in the fifth the border is 
lightly concave); the sixth, sometimes the seventh, ninth, eleventh, and thirteenth with their angles 
strongly produced, and posterior border deeply, but narrowly, emarginate ; the eighth, tenth, twelfth, and 
fourteenth with the posterior border widely emarginate and the angles sharp. In younger specimens 
(15 millim. or less) the angles of the sixth tergite are rounded, and the posterior borders of the rest much 
less markedly emarginate. 
Sternites mesially and laterally impressed, shortly and sparsely hairy. 
Legs of moderate length ; the first pair armed below as follows—0, 0, 1 (posterior), 1, 1; anal legs short, as long 
as the fourteenth pair, armed below 0, 1, 3, 3 or 2, 1, claw double; coxa with superior and lateral spine* ; 
coxal pores 4, 3, 3, 3, arranged in a single series, large and round; coxe of thirteenth and fourteenth 
with a superior spine. 
3. Tibia of fourteenth pair a little stouter than the patella, subcylindrical, with a conspicuous, short, 
ovate depression on the upper-inner surface at its distal extremity; tibia of anal leg also cylindrical and 
stouter than, or at least as stout as, the patella, with a somewhat similar, although much less conspicuous, 
depression. 
* When these spines are invisible, their absence is probably to be attributed rather to mutilation than 
variability. 
