542 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



segments about equal in length; last three with posterolateral angles 

 produced but rounded, angles of last reaching to end of third abdom- 

 inal segment. First three abdominal segments about equal in 

 length and shorter than either the fourth or fifth; lateral parts of the 

 first concealed by the last thoracic segment. Telson short, about 

 as long as preceding segment, apex triangular, rounded at tip. 



Eyes rather small, with 10 facets. Second antenna extending to 

 end of third thoracic segment, spinulose; first segment short, second 



Fig. 4.— Philoscia walkeri. o, antenna; t, telson; u, ubopod. 



and third subequal in length; fourth one-fourth longer than third; 

 fifth one- third longer than fourth; flagellum 3-segmented, without 

 the slender terminal seta about as long as preceding segment. Man- 

 dible with 4-toothed tip; below tip are two plumose setae; lower 

 down a brush; no palp. First maxilla with inner plate armed with 

 two plumose processes; outer plate with eight curved spines. 



Legs slightly increasing in length from before backward. Uropods 

 with basal segment broad; outer ramus one-third longer than inner 

 one, tapering; inner ramus broad, oval (fig. 4). 



Color, deep brown; a broad white band across the anterior margin 

 of each thoracic segment (these bands give the isopod a striped 

 appearance); a patch of irregular longitudinal bands extends back 

 from the anterior band on each side of the thoracic segments; head 

 with many small elongated white markings. Ventral surface white. 

 Legs white, mottled with delicate brown markings. 



This species was fairly common under stones, grass, and logs, and 

 in bromeliads at the top of San Lorenzo (8,300 feet) on July 19 and 

 23. Two specimens were also taken in the forest below at an alti- 

 tude of about 4,500 feet. 



PHILOSCIA NITIDA Miers. 



This was an abundant species in the forest from "La Rosa" 

 (fig. 1) to the top of San Lorenzo. It was usually found on the 

 ground among leaves or under logs but was also taken on tree trunks, 



