ISOPOBS OF NOKTH AMERICA. 



603 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS PHILOSCIA. 



a. Surface of body smooth, without spines. 

 b. Terminal segment of body broadly rounded posteriorly. 



Philoscia richmondi Richardson 



b / . Terminal segment of body posteriorly triangular, with apex more or less pro- 

 duced. 

 c. Second antennae short, shorter than half the length of the body. 



d. Front of head indistinctly trilobate Philoscia culebrx Moore 



d / . Front of head straight or very slightly arched. 



e. Body striped with two broad dorsal bands Philoscia vittata Say 



e f . Body violet, covered with white spots, the margins of the segments being 



white Philoscia brevicornis Budde-Lund 



c / . Second antennae very long, much longer than half the length of the body. 



Philoscia bermudensis Dahl 

 a'. Surface of body covered with numerous spines Philoscia spinosa Say 



PHILOSCIA RICHMONDI Richardson. 



Philoscia richmondi RICHARDSON, Proc. U. S. Nat. Mue., XXIII, 1901, pp. 564-565. 



locality. El Yunque, Porto Rico, at an altitude of 2,800 feet. 

 Body oval; surface smooth. Head not set in the first thoracic seg- 

 ment, evenly rounded, with no lateral or frontal lobes. Eyes large, well 

 developed, lateral. An- 

 tennae equal to half the 

 length of the body; fla- 

 gellum composed of three 

 joints. 



Segments of thorax 

 subequal. 



Abdomen a b r u b 1 1 y 

 narrower than thorax, 

 with the lateral processes 

 of the segments not pro- 

 jecting. Terminal seg- 

 ment equal in length to the preceding segment, much broader than 

 long, and with the posterior margin broadly rounded. The basal joint 

 of the uropoda projects beyond the terminal segment of the body. 

 The inner branch extends to the middle of the outer branch. 

 Legs gradually increasing in length. 

 Color, mottled brown and yellow. 



A number of specimens were collected by Dr. C. W. Richmond and 

 Dr. L. Stejneger at El Yunque, Porto Rico, at an altitude of 2,800 feet. 

 Named for Dr. C. W. Richmond, of the U. S. National Museum. 

 Type. Cat. No. 23913, U.S.N.M. 



FIG. 658. PHILOSCIA 

 RICHMONDI. 



FIG. 659. PHILOSCIA RICHMONDI. 

 a, MAXILLIPED. b, MANDIBLE. 



a The description of Philoscia nigricans Budde-Lund does not give sufficient char- 

 acters to place it in the key. 



