chamberlin: chilopods from Mexico and west indies. 509 



ectal end extended cephalad into a conspicuous process which re- 

 sembles a hirge proximal joint to the palpus which it bears, giving 

 the latter the appearance of being triarticulate. Palpus distinctly 

 biarticulate, the second article large, bending about distal end of 

 inner process; no lappets present. Inner process set off by a distinct 

 suture. Second maxillae with coxae completely coalesced. Palpus 

 not long; ending in a large simple claw. 



Prehensors small; largely concealed by head in dorsal view; wholly 

 unarmed. Claw slender but not constricted or excavated proximally; 

 when closed extending a little distance beyond front margin of head. 



Prosternum with chitinous lines strongly developed but incomplete 

 cephalad. 



Ventral pores in a transverse band in front of caudal margin, the 

 band commonly divided at middle. 



Last ventral plate wide. 



Coxopleurae each Avith pores opening as two pits of moderate size 

 at edge of sternite. 



Anal pores not manifest. 



Anal legs composed of six articles distad of coxopleurae; clawless. 



Genotype. — P. lestes, sp. nov. 



Apparently most closely related to Agathothus, from which it differs 

 in having the inner branch of the first maxillae separated off by a 

 suture, the outer branch elevated on a distinct process of coxa, the 

 prosternum provided with chitinous lines, coxopleural pores in form of 

 two pits on each side, and the anal legs clawless. 



Pagotaenia lestes, sp. nov. 



Dorsum light greenish brown; darker, clearer brown cephalad; 

 lightest caudad. Head, antennae, prosternum, and prehensors dilute 

 chestnut. Venter of greenish brown cast. Legs pale brownish. 



Body of typical Linotaenia form being strongly narrowed from 

 middle region both caudad and cephalad; entire body clothed with 

 numerous straight short hairs. 



Head small with true frontal suture not present, but a pale line in 

 its place more or less traceable. Wider than long in ratio 12:1L 

 Anterior or frontal portion semicircularly rounded, or the anterior 

 margin mesally somewhat angulate. Sides convex. Head widest 

 between frontal region and caudal end. Caudal border a \'er\- little 

 overlapped by the basal plate. A median longitudinal sulcus evident 

 on posterior portion. Hairs short, numerous. Basal plate wide; 



