616 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



than the second. The second pair of antenna extend to the middle of 

 the third thoracic seg-ment. 



The segments of tlie thorax are subequal, the first one having the 

 antero-lateral angles produced so as to surround the head and extend- 

 ing as far as the base of the antero-lateral lobes. The epimera are 

 perfectl}^ united with the segments. 



All six segments of the abdomen are distinct, the first two having 

 the lateral parts concealed by the seventh thoracic segment. The 

 lateral parts of the third, fourth, and fifth segments are produced to 

 continue the oval outline of the body. The sixth, or terminal, seg- 

 ment is 2i mm. wide at the base, is triangulate, with apex produced 

 in a long, narrow process. The sixth segment is 2 mm. long from 

 the base to the extremity. There is a shallow groove extending the 

 length of the produced apex of the terminal segment. The basal 

 article or peduncle of the uropoda extends to the tip of the posterior 

 angles of the lateral parts of the fifth abdominal segment. The inner 

 branch is H nnw. long, and is partly concealed dorsally by the apical 

 process of the terminal abdominal segment, but extends half its length 

 beyond this process. The outer branch is 2^ mm. long, and extends 

 almost its entire length beyond the extremity of the terminal abdomi- 

 nal segment. 



The legs are all ambulatory in character and spinulose. 



In color it is a dark gray, with two longitudinal bands of a lighter 

 color in wavy stripes, one on either side of the median line. 



PORCELLIO PARVICORNIS Richardson. 



PorcelUo parricornis Richardson, Trans. CoQn. Acad. Sciences, 

 XI, 1902, p. 302, pi. XL, fig. 57. 



Locality. —Bermudas. 



Body ovate, surface marked with minute granula- 

 tions. Color yellow, with markings of light brown. 



Head with median lobe small, widely rounded. 

 Lateral lobes small, rounded. Eyes distinct, and situ- 

 ated on the lateral lobes of the head. Exterior an- 

 tenna^ short, about one-third the length of the bodv; 



Fig. 667.— Pokcel- .... . . , , " 



Lio PARvicoKNis. flagellum two-jomted, first joint very much shorter 



than second joint, about one-third shorter. 

 Thoracic segments subequal, with the exception of the first, which 

 is a little longer than an}- of the others. 



First two abdominal segments with lateral parts hidden by the 

 preceding thoracic segment. Three following segments with lateral 

 parts expanded, the margins continuing the oval outline of the body. 

 Terminal segment triangular, with sides somewhat incurved and 

 rounded at the apex. Basal joint of uropoda reaching a little more 

 than half the length of the last abdominal segment. Inner branch 



