GEOPHILUS.—CHOMATOPHILUS. 39 
with a very small inner tooth, the two following segments unarmed, the claw with a distinct tooth at its 
base, 
Basal plate rather large, its length greater than half its anterior width, sparsely punctured, mesially impressed. 
Tergites : the first scarcely bisulcate, the rest conspicuously so, sparsely hairy at the sides. 
Sterna mesially impressed, posteriorly porous. 
Anal somite: tergite elongate, its sides converging posteriorly, not covering the pleure laterally. Pleure 
porous anteriorly above, below, and laterally, smooth posteriorly ; sternite narrow, narrower posteriorly ; 
legs a little longer than the pair that precede them, clawless, moderately robust, stouter in the ¢ than 
in the 2, and more densely hairy. 
Number of pairs of legs—in ¢ 53,in 2 55. 
Length up to 24 millim. 
Hab. Guatemata, near the city (Stol/). 
CHOMATOPHILUS, gen. nov, 
1. Chomatophilus smithi, sp.n. (Tab. III. fig. 12.) 
Body moderately robust, attenuated anteriorly. 
Colour ochraceous, head and maxillipedes a shade darker. 
Head elongate, narrow, a little longer than wide, narrowed slightly anteriorly, with lightly convex lateral 
margins and straight posterior margin, smooth. 
Antenne moderately elongate, thick at the base, gradually narrowed towards the apex, the segments cylindrical, 
not longer than wide, the apical segment ovate, a little longer than the penultimate. 
Prebasal plate invisible ; basal plate very wide, as wide anteriorly as the head, as wide posteriorly as the first 
tergite, with its margins converging. 
Maszxillipedes shining, punctured ; the coxal plate large, with deep, distinct, chitinous lines, the anterior border 
straight, visible from above in the angle formed by the head and basal plate; jaws small and weak, 
entirely covered both laterally and in front by the head-plate; the femur short and unarmed, the claw 
moderately robust, curved, also unarmed. 
Tergites smooth, lightly bisulcate, wider and about four times as long as the prescuta. Pleural prescuta large 
and round, much larger than the tracheal selerites which are in contact with the tergites. 
Sternates finely punctured, flat, not sulcate, and without distinct porous areas. 
Anal somite small; tergite triangular, as wide anteriorly as the one that precedes it; its sides rapidly con- 
verging posteriorly ; pleure small, without visible pores, almost covered by the tergite above, and very 
largely by the sternite below; sternite very wide, nearly twice as wide as long, considerably wider than 
that of the preceding somite, with its lateral margins and posterior angles convex and its posterior border 
straight, the pleure projecting posteriorly slightly beyond it ; legs short, a little longer than the preceding 
pair, the femur and coxa enlarged, the other segments moderately stout, cylindrical, pubescent, armed 
with a claw. 
The rest of the /egs thicker in the anterior than in the posterior half of the body, where they are moderately 
long and slender. 
Number of somites 81. 
Length about 45 millim. 
Hab, Mexico, Amula in Guerrero 6000 to 7000 feet (H. H. Smith). 
A single example, probably a male. In its small and weak maxillipedes and large 
basal plate this new genus comes near Himantarium, but it differs from all known 
Geophilide in the remarkable width of the anal sternite. 
