20 University of Michigan 



lower Carsevenne, a river of northern Brazil just east of French 

 Guiana. In geayi the anal legs of the male have the third, fourth, 

 and fifth articles much more densely pilose than in the female, 

 whereas in the present species there is no such difference. The 

 figure given by the authors mentioned (Fig. 30) to illustrate the 

 coxal glands of geayi shows the caudal margin of the last ventral 

 plate as straight or slightly incurved, whereas in the present 

 species it is distinctly convex. The prehensors in geayi are smaller, 

 when closed (as shown in Fig. 24, op. cit.) falling short of the front 

 margin of the head, whereas extending well beyond it in gaigei. 

 The prelabral setae in geayi are twelve in number in two series 

 caudad of the postantennal pair, whereas there are but six {^-\-:^) 

 in a single series in the present form, or rarely with one or two 

 extra ones in a second line. Teeth of the lateral pieces of the 

 labrum in gaigei seven to ten, in geayi more than twelve. Metam- 

 eric pores in coxosternum of second maxillae four times as far 

 apart as each pore is from the corresponding caudo-ectal angle of 

 coxosternum in gaigei, whereas they are only two and a half times 

 as far apart as this distance in geayi. The present species is larger, 

 the maximum length being 45 mm. as against 25 mm. 



Schendylurus colombianus, sp. nov. 

 Plate IV, Figs. 18 and ig 



Cephalic plate with two furrows extending from caudal margin 

 forward to about the middle. Short and broad, longer than wide 

 in the ratio 9 : 8. Anterior margin obtusely angular. 



In prelabral region eight setae in tw^o series caudad of the 

 postantennal pair; thus, i+i, 2>~^Zi i+i) the last two setae but 

 little caudad of the preceding series and close to the middle. A 

 clypeal area, or area of smaller reticular polygons, between and 

 extending both cephalad and caudad of these two last setae, as 

 also described for lesnei Brolemann and Ribaut, but more in front 

 than behind the setae. 



