198 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Last ventral plate very wide; trapeziform; the sides moderately 
converging caudad; caudal margin mesally incurved as in manni 
(Plate 4, fig. 7). 
Coxopleural pores appearing as two large pits on each side, these 
being wholly covered by the last ventral plate excepting for a small 
ectal portion of each (Plate 4, fig. 7). 
First pair of legs a little more slender than the second, but not at 
all or but slightly shorter. Posterior pairs of legs longer and propor- 
tionately more slender than the anterior ones. 
Anal legs (2) much longer than the penult. Scarcely thickened. 
The ultimate article about equal in length to the preceding one and 
not more slender; but the last two articles together more slender 
than the tibia. Hairs more numerous than on other legs, especially 
on the proximal joints (Plate 4, fig. 7). Pairs of legs ( 2 ) forty-seven. 
Length 24 mm. 
Locality.— State of Amazonas: Mandos! (Mann and Baker). 
One female. 
Manifestly close in the main structural features to S. perditus. It is 
a materially larger form; has forty-seven pairs of legs as against thirty- 
seven in the latter species, has the antennae relatively much shorter; 
and the last article of the anal legs is proportionately much shorter 
and thicker as shown in the figures. 
SCHENDYLURUS PERDITUS, sp. nov. 
Body whitish, tinged with dilute lemon-yellow which is more 
evident anteriorly. Head and prosternum with prehensors ferrugi- 
nous. Antennae brownish yellow of faint ferruginous tinge. 
Moderate or slender; only slightly attenuated cephalad, more 
abruptly so caudad. Hair very sparse and mostly short over body, 
and those of legs also sparse. 
Cephalic plate evidently longer than wide, the ratio being about 
5:4.4. Widest toward anterior end where the sides are convex; 
from this region caudad the sides are more nearly straight and con- 
verge at first moderately and then more abruptly toward the posterior 
corners; caudal margin appearing considerably incurved. Frontal 
suture not present. (Plate 4, fig. 1). 
Labral margin armed in the type with eighteen rather large, sub- 
acute, and strongly chitinous denticles, those at the sides being smaller, 
with apices turned mesad, and more acute than the more median ones. 
