1940] 
Chilopods from Panama 
67 
One specimen was taken on Sept. 3. Barro Colorado Id. 
is the type locality for this species, the holotype, a male, 
having been taken from a nest of the termite Anoplotermes 
gracilis Snyder by James Zetek, 30 Oct., 1924. 
BALLOPHILIDiE 
Assuming that the inadequately known genotype of 
Txniolinum belongs to the Ballophilidse, as seems reason- 
ably certain, and that it is congeneric with the form here- 
after described as T. panamicus , the known genera of this 
family may be separated by means of the following key. 
Key to Genera of Ballophilidce 
a. Ventral pores condensed, in one or two sharply limited and usually 
more or less elevated areas, 
b. Ventral pores in a single, undivided field, 
c. Antennae clavate. 
d. Prehensors lacking chitinous lines Ballophilus Cook 
dd. Chitinous lines present on prosternum of prehensors. 
e. Coxae of last legs with a single pore on each side ; 
tergites bisulcate Tanophilus Chamberlin 
ee. Pores of last coxae two on each side ; tergites not bi- 
sulcate. 
f. Field of ventral pores transversely elliptic. 
ThalthyMus Attems 
ff. Field of ventral pores strictly circular. 
Ityphilus Cook 
cc. Antennae short, distally attenuated.— -Leptynophilus, gen. nov. 
bb. Ventral pores in two circular areas on each sternite. 
Diplethmus Cook 
aa. Ventral pores diffuse, in an indistinctly limited band over caudal 
boarder ; joints broader than long. Antennae short and thick. 
T (zniolinum Pocock 
Diplethmus dux, sp. nov. 
The general color of the body is olivaceous, the integu- 
ment above being brown with dense green pigment showing 
through from beneath, the integument of sides and venter 
paler. Legs green. 
Differs from D. ribauti, sp. nov., in the conspicuously 
broader head, in the constantly smaller number of pairs of 
legs (69 as against 77-79), etc. The head is more nearly 
of the proportions represented for the head of D. mexicanus 
