LITHOBIUS. 9 
legs modified, and the tarsi of the fifteenth unmodified, Z. vulcant agrees with 
L. godmani and L. salvini. It may be recognized by having a smaller number of 
antennal segments, the angles of the seventh tergite not produced, and in the different 
structure of the anal leg of the male. 
7. Lithobius decodontus, sp. n. (Tab. I. fige. 9, 9a, d.) 
Colour castaneous. 
Head nearly smooth ; about 9 or 10 ocelli on each side ; frontal plate defined and mesially sulcate. 
Antenne elongate, furnished with 41 or 42 short cylindrical segments. 
Cowal plate of maaillipedes with anterior border deeply notched in the middle, convex on each side of it, and 
armed with 6+4 small subequal teeth. 
Posterior terga lightly wrinkled and sparsely hirsute: the angles of the ninth, eleventh, and thirteenth strongly 
produced, the posterior border of the seventh noticeably emarginate, of the eighth, tenth, and twelfth 
nearly straight, but becoming gradually emarginate towards the hinder end of the body. 
Legs: first pair armed below, 0, 0, 0, 1, 1; coxe of the last three pairs armed with a superior spur, those of 
the last two furnished in addition with a lateral spur; coxal pores uniserial, small, circular, 5, 5, 5, 5; 
anal legs long, slender, longer than the preceding pair, armed below 0, 1, 3, 3, 2; claw double. 
g. Fourteenth and fifteenth pairs of legs unmodified, generative appendages represented by a pair of rounded 
tubercles. 
Length about 20 millim. 
Hab. Guatemata, Volcan de Acatenango (Stol/). 
One male example. A second male, from Quezaltenango, which has the anal legs 
broken off, agrees with the one described in most characters, but it differs in having the 
distal segment of the tarsus noticeably shorter as compared with the proximal segment. 
I consequently expect that the two are specifically distinct. 
This species differs from L. pontifer, L. humberti, L. godmani, and L. salvini in the 
dentition of its maxillary coxe, its unmodified anal legs (in male), and the smaller 
number of its antennal segments. 
8. Lithobius stolli, sp. n. (Tab. I. figg. 10, 10 a—c.) 
Colour fusco-olivaceous, with traces of a dorsal median longitudinal band. 
Head and terg« smooth, sparsely punctured. 
Antenne long, hirsute, composed of 27 elongate cylindrical segments. 
Eyes composed of about 26 ocelli. 
Coxal plate of maxillipedes with anterior border transverse, shallowly notched, the inner half of each side 
furnished with three small, evenly spaced teeth, of which the external is a little the largest. 
The ninth, eleventh, and thirteenth terga with squared angles; the eighth, tenth, twelfth, and fourteenth with 
their posterior borders slightly emarginate. 
Legs: those of first pair armed below as follows—9, 0, 2, 2, 1; coxa of twelfth armed with one upper spine, 
coxe of thirteenth to fifteenth furnished with an external lateral spine as well; the anal legs longer than 
the preceding pair, armed below as follows—0, 1, 3, 2,1; claw simple; coxal pores uniserial, elongate 
as in adult L. forficatus (Linn.), 9, 8, 8, 8. 
Generative forceps of female with two pairs of spurs and simple pointed claw. 
Length 27 millim. 
Hab. Guatemata, Volcan de Agua (Stol/). 
A single female example. 
BIOL. CENTR.-AMER., Chilop., December 189d. c 
