74 University of Michigan 



Length, 38 mm. ; width. 5.2 mm. 



British Guiana : Cacao Plantation about camp. One 

 female taken in rotten wood, July 18, 1914; F. ^l. Gaige. 



Also one female in "Forested Sand Hills," Aug-. 18, 1914; 

 F. M. Gaige. 



Holotype, M. C. Z.. 5.179. 



This and the following one are the first species to be 

 referred to this genus in addition to the genotype. Z. bninnciis, 

 the latter having been described from Trinidad. 



Zigwadesmus modestus, sp. nov. 

 PI. 27. Fig. 194; PI. 2S, Figs. 196-199 



Brown, the keels and a small area just above each paler, 

 as usual. Xo middorsal stripe and no light spots on sides of 

 prozonites. 



The anterior keels as in the other species, the angulation 

 of the fourth more as in brunncus. The posterior angles of 

 keels in general less produced and less acute than in the other 

 two known species. The poriferous processes are obviously 

 different in being directed more nearly ectad, with caudal angle 

 more rounded ; section in the anterocaudal direction shorter, 

 the whole more approaching a cylindrical form. (See PI. 28, 

 Figs. 196, 197, and 198.) 



The Cauda much as in guiamimts, l)Ut the terminal tubercles 

 or processes even shorter. (PI. 28, Fig. 199.) Anal scale 

 with caudal margin between setigerous tuljercles obtusely angu- 

 lar, extending beyond the. tu])ercles. (PI. 27. Fig. 194.) 



Length, about 22 mm. ; width, 3.25 mm. 



British Guiana: Forested Sand Mills. One female of 

 nineteen segments taken in sandy soil of forest floor. Aug. 

 14, 1914; F. :\I. Gaige. Holotype, M. C. Z.. 5,181. 



