6 University of Michigan 



and subspiniform. Tibia also with several stout ventral setae, 

 two usually at distal end. Femur with three or four stout setae in a 

 series beneath. 



Femur of anal legs armed beneath with a series of four stout 

 spines or processes which are as long as the depth of the joint or 

 nearly so;^ along middle of outer surface a series of about seven 

 ordinary spines, and along middle of mesal surface a series of 

 typically five similar spines, the series not extending to distal 

 end ; along dorsomesal edge a series of eleven or twelve simi- 

 lar but longer spines. Tibia in midventral Une with two short, 

 distally curved teeth or spines, one a httle each way from 

 middle, and a single similar spine on mesal surface at proximal 

 end; the other joints unarmed. Metatarsus not produced at 

 distal end beneath. First tarsal joint much thicker and longer 

 than the other as in the genotype, clavately enlarging distad. 

 Distal division of tarsus composed in the type of twenty-three 

 short articles (Plate II, Figs. 6 and 7). 



Length, up to 25 mm. 



British Guiana, Dunoon: Labba Creek, sand-hill forest, 

 July 27, August 19; "second mourie," August 24, 1914. Six 

 specimens. Type, M.C.Z., 2175. 



This is an interesting form in that it is the second species of 

 the genus to become known. The first, T. sitnus Chamberlin, 

 was described from Grenada {Bull. M.C.Z., 59 [1915], p. 496, 

 Plate I). From T. simus the present species differs in various 

 obvious features. Thus, the antennae have seventeen joints 

 instead of thirteen; the dental processes of the prosternum are 

 broader than long, close together, and distally rounded; the femur 

 of the anal legs bears four processes beneath instead of three and 

 these are much longer, the mesal spines are five in number instead 



' Only three ventral processes are present on one side in one specimen, 

 this leg being apparently regenerated. The distal tarsus is much shorter than 

 that of the other leg, but the normal number of articles is present. 



