52 bulletin: museum of comparative zoology. 



(twelve in type) long, dark, fang-like teeth; free edge of median and lateral 

 pieces forming an almost even concave line, the three pieces fitting closely 

 together; lateral pieces densely pectinate. First maxillae with both branches 

 separated off; the outer one biarticulate, with the two articles about equal in 

 length, the first without lappet; coxae at middle membranous, being well 

 chitinized only laterally, each bearing a long membranous lappet. Second 

 maxillae with claw of palpus divided; coxae not completely fused at middle, 

 a suture evident. Ventral pores lacking. Last segments as in Pachymerium. 

 Last ventral plate small. Coxopleurae with numerous pores above, laterally 

 and below. Anal legs with claws. 



Genotype. — P. zygethus, sp. nov. 



112. Pachymerellus zygethus, sp. nov. 



Type.— M. C. Z. 1,892. Paratypes.— M. C. Z. 1,893. Tas- 

 mania (G. H. Hardy). 



Color yellow of a dilute ferruginous tinge. 



Body widest anteriorly, narrowing continuously caudad. 



Cephahc plate widest posteriorly, conspicuously narrowing cephalad. 

 Anterior border convex, posterior border concave. No frontal suture. An- 

 tennae very short. 



Basal plate overlapped anteriorly by the cephaUc plate, the exposed portion 

 broad and short, five times wider than long. 



Prehensors stout. Claws when closed scarcely exceeding the cephalic 

 plate. Femuroid very short on mesal side. Claw armed at base with a 

 stout, low, conical tooth. 



Prosternum with two blunt dentiform plates anteriorly; chitinous lines 

 distinct excepting at extreme anterior end. 



Anterior spiracles large, elUptic, the first largest though not greatly so, 

 gradually decreasing in size caudad and gradually becoming circular. 



Beginning with the second, the sternites are conspicuously marked with a 

 median concavity or pit which increase in size and depth back to the ninth 

 and tenth plates and then again decrease, practically disappearing after the 

 sixteenth somite. No pores detected. 



Last ventral plate small, shorter than wide, trapeziform, being narrowed 

 strongly caudad and being caudally truncate. Coxopleurae inflated; bearing 

 numerous small pores below and above and fewer ones laterally. 



Anal pores small. 



Pairs of legs, fifty-five. 



Length, near 35 mm. 



113. SOGOPHAGUS SERANGODES (Atteilis). 



Geophagus serangodes Attems, Abhandl. Senckenb. gesellsch., 1897, 23, p. 476.^ 

 Locality. — Halmaheira: Scab Konorah.^ 



