36 CHILOPODA. 
between it and the pleure nearly parallel to the long axis of the body, 
basal plate narrow, much narrower than the first tergite. 
a'. Anal tergite short and wide, covering the pleure infront. . . . . toltecus,H. & S. 
6’. Anal tergite much longer, narrower, not covering the pleure in front ; 
pleure distinctly porous above. | 
a’. Coxe of maxillipedes scarcely punctured; posteriorlegs shorter, stouter, 
the segments decreasing in length distally ; under 30 mm. in length, 
and with fewer than 60 pairs of legs. . . . . . «ee +e) Stolli, sp. n. 
b°. Coxe of maxillipedes coarsely punctured; anal legs longer, the 
segments distally increasing in length; over 40 mm. in length, and 
with over 70 pairs of legs. 
a’. Anal pleure weakly inflated, and not extending forward on each 
side of the anal prescutum . . . Loe . 2 « «6 Salvini, sp. n. 
6°. Anal pleure strongly inflated and extending forwards on each side 
of the anal prescutum. . . . . 1 ee ee ee ee  godmani, sp. n. 
1. Geophilus aztecus. (Tab. III. figg. 7, 7 ac.) 
Geophilus aztecus, Humb. & Sauss. Rev. et Mag. Zool. (2) xxi. p. 159 (1869)'; Miss. Sci. Mex., 
Myriop. p. 140, t. 6. fig. 21 (1872) *. 
Colour ochraceous, legs testaceous, head and maxillary coxe pale castaneous, the tergites sometimes marked 
in the anterior half of the body with a median wide fuscous band which becomes progressively less 
distinct towards the hinder extremity. 
Body attenuated posteriorly, hairy. 
Head a little wider than long, about as wide behind as in front, its anterior and posterior borders straight, 
lateral borders evenly and lightly convex from angle to angle, punctured and hairy ; frontal suture not 
invisible. 
Antenne short, clothed with shorter and longer hairs, stout, only a little attenuated ; the segments narrowed at 
the base, the apical segment subcylindrical, a little longer than the penultimate, abruptly narrowed and 
pointed at its apex. . 
Cowal plate of mawillipedes wider than long, its sides strongly converging posteriorly, chitinous lines incom- 
plete, anterior border not dentate, lightly excavated, punctured and shortly hairy ; pleure embracing the 
sides of the sternite, conspicuous from below ; jaws short, largely overlapping the head at the sides, but 
scarcely overlapping it in front, the joint of the claw falling short of the anterior angles of the head, 
Prebasal plate just visible, but very short. Basal plate wide and long, as wide posteriorly and as long as 
the first tergite, its anterior border lightly concave, its lateral borders strongly converging anteriorly. 
Tergites, including the first, but with the exception of a few of the last, bisulcate ; shining, sparsely hairy. 
Sternites with a median longitudinal impression and a posterior transverse porous area. 
Pleural prescuta larger than the tracheal sclerites which are in contact with the tergite. 
Anal somite: tergite almost covering the pleura, a little wider than long, wider in front than behind, its sides 
gently converging posteriorly, with rounded posterior angles ; pleure not inflated, smooth, without pores, 
at least on their uncovered portion, bearing a few rounded pores beneath the edge of the sternite ; 
sternite wide, wider than long, with gently converging, lightly convex sides and straight or slightly 
concave hinder margin; prosternal pieces distinct; legs about as long as those of the preceding somite, 
composed of six segments and armed with a claw, thicker in the male. 
Numbers of pairs of legs 57 and 59. 
Length up to 52 millim, 
Hab. Mexico, Eastern Cordillera (Saussure 1 7), Omilteme in Guerrero 7000 to 9000 
feet (H. H. Smith). 
