ISOPODS OF NORTH AMERICA. 



137 



COLOPISTHUS PARVUS Richardson. 



Colopisthus parvus RICHARDSON, Trans. Conn. Acad. Sciences, XI, 1902, pp. 289- 

 290, pi. xxxvin, figs. 33-36. 



Localities. Found in low water in the corallines at Bailey Bay, Ber- 

 mudas, and at Waterloo, Castle Harbor, Ber- 

 mudas. 



Head transversely elliptical, the anterior and 

 posterior margins rounded. The eyes are 

 situated in the middle of the lateral margins 

 at the extreme edge, and are elevated above 

 the surface of the head like knobs. The head 

 is concave between the eyes. 



The first pair of antennae are short, not 

 much longer than the width of the head, and 

 reach the end of the last peduncular joint of 

 the second pair of antennae. The flagellum is 

 composed of three articles. 



The second pair of antennae are also short, 

 extending to the posterior margin of the first 

 thoracic segment; flagellum is composed of 

 seven articles. 



The first thoracic segment is longest. The 

 others are subequal with well-defined epimera. 



The first five a.bdominal segments are all coa- 

 lesced into one segment. The terminal seg- 

 ment is triangular and strongly keeled along 

 the median longitudinal line. 



The inner branches of the uropoda extend 

 beyond the tip of the terminal segment, are 

 broadly oval and fringed with hairs. The 

 outer branches are narrowly oval, about half 

 as wide as the inner branches, and shorter. 



Color light 3 T ellow, with numerous black 

 dots. 



About seven specimens were collected by 

 Prof. A. E. Verrill and party at Bailey Bay, 

 Bermudas, in 1898. Found at low water in 

 corallines. Others were collected in 1901 at 

 Waterloo, on Castle Harbor, Bermudas. 



Type specimen from the Bermudas in Peabody Museum, Yale Uni- 

 versity. Cat. No. 3179. 



FIG. 119. COLOPISTHUS PAK- 

 vus. a, MAXII.LIPED. b, SEC- 

 OND MAXILLA. C, FlRSTMAX- 



ILLA. d, GENERAL FIGURE. 

 e, HEAD AND FIRST TWO 



THORACIC SEGMENTS. 



