BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



PILUMNUS UMOSUS Smith 



Plate 208; Plate 209, Figures 1-3 



Pilumnus limosus Smith, Proc. 

 Boston Soc. Nat. Hist., vol. 

 12, 1869, p. 285 (type- 

 localities, Zorritos, Peru, 

 and Panama; types in 

 P. M. Y. U.).— A. Milne 

 Edwards, Crust. Reg. Mex., 

 1880, p. 291, pi. 50, figs. 4-4b. 



Diagnosis. — Covered 

 with a velvety pubescence 

 forming a pattern leaving 

 scattered tubercles exposed 

 on carapace. Four lateral 

 teeth. Upper and outer 

 surfaces of both palms rough 

 and hairy; only a small spot 

 bare near immovable finger 

 of major manus. 



Description. — Body and 

 appendages covered with a 

 light brown, velvet like 

 pubescence composed of 

 short clavate hairs, among 

 which the tubercles and 

 granules appear as depress- 

 ed pits in the general 

 surface; and around them 

 the pubescence forms a 

 regular, ornamental ' and 

 somewhat reticulate pat- 

 tern. Carapace strongly 

 deflexed in front, much flat- 

 tened posteriorly, and when 

 the hairs are removed, 

 distinctly areolated, and 

 showing above about forty 

 scattered small tubercles or 

 granules. About fourteen 

 of these are on the gastric 

 region, two on each epigas- 

 tric lobe, three or four on 

 each protogastric lobe, 

 one at the extremity of 

 the mesogastric and three 



