Occasional Papers of the Museum of Zoology 15 



Otostigmus brunneus, sp. no v. 

 Plate I, Fig. 4 



Both dorsum and venter brown, the head not differing from 

 tergites. Anal legs oUvaceous distad of femora. 



Head with paired longitudinal furrows at base and a short 

 median sulcus extending caudad from anterior median emargination. 



Antennae long; composed of twenty articles of which the first 

 two are glabrous excepting a few scattered setae, the others 

 abundantly clothed with fine short hairs of the usual character. 



Prosternal teeth 4+4 but the most mesal one on each side 

 united with the adjacent one nearly completely. Basal sulcus as 

 in the preceding species. 



Dorsal plates from the fourth inclusive with paired sulci 

 distinct. Only the last plate laterally margined, its caudal margin 

 strongly convex in middle. Tergites with surface smooth. 



Sternites not distinctly furrowed. Last ventral plate strongly 

 narrowed caudad, its caudal margin incurved. 



Coxopleurae of pregenital segment not produced, caudally 

 simply blunt or rounded. 



Legs of first three pairs with two tarsal spines, the succeeding 

 ones to the antepenult inclusive with a single tarsal spine, the 

 penult and anal legs unspined. 



Femur of anal legs of male with an appendage arising from 

 mesal side toward the base much as in the preceding form; the 

 appendage reaching only about two-thirds the distance to the 

 caudal end of femur, much more slender than that of the preceding 

 form, cylindrical, distally somewhat clavate and rounded and 

 with a small patch of golden-brown hair on mesal side of end 

 (Plate I, Fig. 4). 



Length, nearly 7,2 mm. 



British Guiana, Dunoon: "first mourie," August 5, 1914, F. M. 

 Gaige, one male taken "among fallen leaves in a tree clump"; 



