Occasional Papers of the Museum of Zoology 3 



First segment of thorax with large lateral extensions ; 

 dorsal surfaces of lateral parts concave, bearing twenty spines. 

 Coxopodites long and diverging from lateral margins poster- 

 iorly. Thoracic segments 2-7, each bearing 13 spines and hav- 

 ing long narrow lateral expansions. Second segment with nar- 

 row, divergent, truncate coxopodites. 



Abdominal segments i and 2 unarmed and concealed ; 3 and 

 4 with four spines ; 5 and 6 wnth two spines each. The sixth 

 or terminal segment constricted in the middle, bearing two 

 spines near the anterior border, and with its posterior margin 

 arcuate-emarginate. Uropoda acute at tip; their inner rami 

 about a third as long as the sixth segment ; outer rami conical 

 and half as long as the inner. 



About seventy-five specimens were collected. They were 

 found in rotten logs, under dead leaves on the ground, in the 

 hollow stems of plants, among moss in trees, in bromeliads, 

 in masses of aerial rootlets, and under the bark of trees. 



Type Specimens: Cotypes Cat. No. 50864, University of 

 Michigan, Museum of Zoology. Collected under leaves on 

 ground among the tree clumps on the "mouries," July 30, 

 T914, Dunoon, British Guiana; F. M. Gaige, collector. 



Remarks: This species resembles Cubaris echinatus 

 Brandt but differs from it in having 13 spines on each of the 

 six posterior thoracic segments, and in lacking distinct coxo- 

 podites on the third thoracic segment. 



Sphaeroniscus portoriccnsis Richardson. 



Forty-three specimens were taken from bromeliads on the 

 summits of sand hills on July 30, and twenty-one from an 

 abandoned termite nest on a mourie, August 20. 



