30 CHILOPODA. 
Pleure of the anal segment coarsely porous; the process long, slender, and simple. 
Anal legs spinous, antenniform, the posterior tarsal segment being clawless and divided into many or few 
segments. 
At present two genera only of this family have been established. They may be 
recognized as follows :— 
a. The distal tarsal segment of the anal leg divided into many minute 
ill-defined segments. . . . . ..... . =. +. . . . SCOLOPENDRIDEs, Sauss. 
(Type mexicanus, Sauss.) 
6. The distal tarsal segment of the anal legs divided into relatively few 
distinct, sharply-defined, long, cylindrical segments . . . . . Newport, Gervais. 
(Type longitarsis, Newp.) 
SCOLOPENDRIDES. 
Scolopendrides, Saussure, Rev. et Mag. Zool. 1858, p. 546. 
The following table will serve to show some of the differential characters of the 
species of this genus :— 
a. Tibia of anal leg spined beneath ; spines on the inner edge of the 
femur apparently as large as those on the lower surface of this 
segment . .. . a . . « mexicanus, H.& 8. 
6. Tibia of anal leg unarmed ; ; spines on the inner edge of the femur 
much smaller than those on the lower surface. 
a'. Terga not mesially carinate. 
a, The protarsus of the anal leg wider than the tarsus; the 
head transversely sulcate posteriorly ; patella of anal leg 
armed beneath with two spines; transverse sulcus of first 
tergite semicircular. . . . . . .  [ernsti, Poc. — Venezuela 
6’. The protarsus of the anal leg not , wider than the tapas: ; and St. Vincent. | 
head not transversely sulcate; transverse sulcus of first 
tergite ovate; patella of anal leg armed with one inferior 
spine... woe ee ee we we ew ww.) Lbrevipes, Poc.—Demerara. | 
6. Terga mesially carinate ; spine-armature of anal legs as in 
S. ernsti; head not transversely sulcate; sulcus of first 
tergite part of a circle; protarsus and tarsus of anal leg 
approximately equalin width . . . . . . . . . . stolli, sp. n. 
1. Scolopendrides mexicanus. 
Scolopendrides mexicana, Sauss. Rev. et Mag. Zool. 1858, p. 546°. 
Scolopocryptops mexicana, Sauss. Mém. Mex. Myr. in Mém. Soc. Phys. Genéve, xv. p. 13], t. 7. 
fig. 48”. 
Newportia mexicana, Humb. & Sauss. Miss. Sci. Mex., Myriop. p. 138°. 
Hab. Mexico, Cordova !~3, 
