602 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



The flagellum i« composed of three articles. When retracted the 

 second antennae extend to the posterior margin of the third thoracic 

 segment. 



The segments of the thorax are sabequal in length. The tirst seg- 

 ment has the antero-lateral angles produced to surround the head, and 

 they extend almost to the extremity of the antero-lateral lobes of the 

 head. The lateral parts of all the segments are expanded, but there is 

 no indication of epimera on an}^ of the segments. The lateral margins 

 are straight. 



The segments of the abdomen are all distinct, the tirst two being 

 somewhat shorter. The lateral parts of the first two are entirely 

 concealed b}- the seventh thoracic segment. The lateral parts of the 

 third, fourth, and tifth segments are expanded and produced so as to 

 continue the oval outline of the bod}^; those of the tifth segment 

 extend posterioi'l}' as far as the extremity of the sixth or terminal 

 segment. The terminal segment is triangular, with the apex produced 

 in a long process, 2 mm. in length and pointed posteriorly. The basal 

 article or peduncle of the uropoda extends to the middle of the pro- 

 duced portion of the terminal abdominal segment. The inner branch 

 extends to the extremity of the process of the terminal segment and is 

 concealed by it except at 'the lower portion. The outer branch is 2 

 nun. long and extends the length of 1 mm. beyond the terminal 

 abdominal segment. 



The legs are all am])ulatory in character. 



In color, the dorsal portion of the body is a dark brown. There is 

 a longitudinal row of light yellow spots on either side of the thorax, 

 about the place of union of the epimera with the segments. The 

 lateral margins of the bodj^ are also light j'ellow. The dorsal portion 

 of the body is slightly granular. 



107. Genus PHILOSCIA Latreille.« 



Body oval, slightly convex, very little or scarcely at all contractile. 



Head rounded in front, without lateral lo])es. Second pair of 

 antenna^ long; tlagellum composed of three articles. Frontal mar- 

 ginal line very often wanting in the middle, bent downward on either 

 side, surrounding the epistome and extending to the vertical marginal 

 line back of the e3'es. 



Al)domen abruptly narrow^er than thorax; lateral parts of the third, 

 fourth, and tifth segments ver}^ small, appressed; terminal segment not 

 much produced. 



Opercular plates of the pleopoda without trachea\ Uropoda with the 

 inner branch not attached far in front of the outer branch. 



Lateral parts of the thorax but slightly expanded. 



«For characters of genua see B"/. -de-Lund, Crust. Isop. Terrestria, 1885, p. 207, 

 and Sars, Crust, of Norway, II, 1899, p-^. 172-173. 



