ISOPODS OF NOETH AMERICA. 



603 



ANALYTICAL KEY" TO THE SPECIES OF THE (lENUS PHILOSCIA. 



a. Surface of IVxly sinootli, without si)iiies. 



I). Teruiiual segment of l)0(ly l)roa(lly rounded posteriorly. 



Pli'dofic'ui richinondl Richardson 

 //. Terminal segment of body posteriorly triangular, with ai)ex more or less pro- 

 duced, 

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



d. Front of head indistinctly trilobate I'liilosda adebr.-r Moore 



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



e. Body striped with two bn )ad dorsal bands /'/( ilaKcIa ritUda Say 



e^. Body violet, covered with white spots, the margins of the segments ])eing 



white Phlloscia hreiicornh Budde-l.und 



c\ Second antenn;e very long, much longer than half the length of the l)ody. 



I'liUoscia hermudensis Dahl 

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



PHILOSCIA RICHMONDI Richardson. 



PhUoscia richmondl Richardson, Proc. U. S. Nat. Mus., 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, ev' enly rounded, with no lateral or frontal lobes. Eyes large, well 

 developed, lateral. An- ^ 



tennse equal to half the 

 length of the body; fla- 

 gellum composed of three 

 joints. 



Segments of thorax 

 subequal. 



Abdomen abrul)tly 

 narroAver 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 graduall}' increasing in length. 

 Color, mottled brown and yellow^ 



A number of specimens were collected b}' Dr. C. W. Richmona 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.—Q2.i. No. 23913, U.S.:fi\M. 



Fig. 658.— PHILOSCIA 



RICHMONDI. 



Fig. 659.— PHILOSCIA RICHMONDI. 



0, Maxilliped. b, Mandible. 



« The description of Philoscia nigricans Budde-Lmid does not give sufficient char- 

 acters to place it in the key. 



