Occasional Papers of the Museum of Zoology 5 



Head with paired median sulci showing only as short lines at 

 posterior border as in T. simus Chamberlin. Caudal margin 

 widely convex, more flattened in middle region. Anterior margin 

 notched at middle, a short median sulcus extending caudad from 

 the notch. 



Antennae somewhat flattened, composed of seventeen articles. 

 First four or five articles rather sparsely hirsute, the succeeding 

 ones becoming more and more densely clothed with fine short hairs. 



Claws of prehensors dwarfed as in the genotype. Anterior 

 margin of prosternum bearing two broad teeth or dental plates 

 which are contiguous or subcontiguous at middle and are distally 

 obliquely truncate, longest on outer side, wider than long (Plate I, 



Fig. 5)- 



Transverse sulcus of first dorsal plate bent back at middle in 

 an obtuse angle which lies in a shallow depression, the sulcus free 

 from the cephaHc plate. The paired longitudinal sulci furcate 

 anteriorly as in the genot}^e, the inner branches meeting at the 

 angle of the transverse sulcus. Paired submedian sulci present 

 also on succeeding tergites, including the second; lateral sulci 

 beginning on the third. With no median keel set off on posterior 

 plates. Last tergite with caudal margin truncate at middle and 

 concave on each side, without a median sulcus but with a shallow 

 median depression or pit. 



Each normal sternite with a deep median longitudinal sulcus 

 which does not cross the anterior portion of plate. Last ventral 

 plate with caudal margin incurved. 



Process of coxopleurae moderately long, with apex acute and 

 single. No lateral spines. Pores small, numerous. 



Spiracles obliquely elliptic and rather large. 



Anterior tarsi undivided. Tarsi unspined. 



Each metatarsus of anterior legs with a stout spine at distal 

 end on anterior side, and a more slender spine or spiniform seta at 

 distal end beneath, several other ventral setae also ordinarily stout 



