Occasional Papers of the Museum of Zoology 53 



Gonopods of male as shown in PI. 20, Fig. 135. and PI. 19, 



rig. 132. 



Length, female, 36 mm. ; width, 5 mm. 



Colombia : Fundacion. About 18 specimens, mostly badly 

 preserved and faded, from under a log along Fundacion 

 River. Aug. 12. 1913. Holotype, ^I. C. Z.. 5.142. 



Colombodesmus, gen. nov. 



Like Trachelodesmus and related genera in having sterna 

 broad and in large part bearing paired spines, but a spine at 

 base of each leg on segments where present instead of only 

 at base of legs of each posterior pair, and the last pair of 

 spines not more strongly developed than the others. Keels 

 well developed in anterior region, marginally serrate, becom- 

 ing more weakly developed, less projecting in middle and pos- 

 terior region. The pores borne on distinct lateral processes 

 on caudal portion of margin ; present on segments 5, 7, 9, 10, 

 12. 13. 15-19. Body not ob^-iously constricted in neck-line form 

 anteriorly. Metatergites finely tubercular or granular. Cauda 

 triangular, tip narrowly truncate. Legs, in the genotype at 

 least, granular, as in most species of Trachelodesmus; the 

 claws well developed. 



Genotype, C. catharus, sp. nov. 



Colombodesmus catharus, sp. nov. 

 PI. 20. Figs. 136-140: PI. 21, Fig. 141 



The type at present has the prozonite above and on the 

 sides smoky brown, the body otherwise at present light grey 

 throughout excepting a pair of light brown spots on the front 

 of metatergites. the two spots on collum large and subconflu- 

 ent. Legs and antennae light yellowish grey, darker distally, 

 especially the tip of antennae. 



