56 University of Michigan 



of cathants, but with the poriferous process proportionately 

 much smaller and less sharply set off ; this process shortly sub- 

 cvlindrical. with distal end oblique and having a semicircle of 

 granules above and overhanging the pore. (See PI. 21, Figs. 

 142 and 144.) The dorsal surface of metatergite more 

 strongly granular; with two transverse series of slightly 

 larger, setigerous granules or tubercles behind transverse sul- 

 cus and one in front of it, the latter of fewer granules. Sides 

 of segment also obviously more concavely and densely granu- 

 lar than in the other species. Anal valves and scale more 

 strongly granular than in cathanis. 



Spines of sterna nearly as in the genotype, but the poste- 

 rior pair of each segment larger proportionately to the anterior 

 pair. 



For form of leg, see PI. 21, Fig. 143. 



Length, about 35 mm. ; width, 4 mm. 



Colombia : San Lorenzo. One female under leaves at 4,500 

 feet; July 21, 1913. Also one female under log at edge of 

 clearing at 4,500 feet ; July 9, 1913. 



One male, in which the gonopods had unfortunately been 

 broken off and lost, under leaves at 2,000 feet; July 16, 1913; 

 F. M. Gaige. 



Holotype. M. C. Z.. 5,145. 



Cormodesmus, gen. nov. 

 Sterna narrower than in Colombodesmus, Trachelodesmus, 

 etc. Without sternal spines, but with a rounded tubercle at 

 base of each leg on its anteromesal side on all but anterior 

 segments. Metatergites wider comparatively between anterior 

 corners than between posterior. Keels all well developed, 

 thick, laterally lobed through the development of large tuber- 

 cles, elevated above dorsum. No repugnatorial pores obvious, 



