210 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



a b 



FIG. 212. ROCINELA SIGXATA. a, M AX- 



ILLIPED. x 51|. b, SECOND LEG. x 



extremity very acute in the last four. The seventh epimeron is pro- 

 duced beyond the posterior margin of the segment. 



The first segment of the abdomen is almost entirely concealed by the 

 seventh thoracic segment. The lateral parts of the segments are not 



distinct from the dorsal portion. The 

 sixth or terminal segment is rounded pos- 

 teriorly and furnished with short spines. 

 At the base of the terminal segment is a 

 short median longitudinal black line, with 

 two much shorter lines, one on either 

 side, all connected at the base. On either 

 side of this group of three longitudinal 

 lines, and connected with the lateral lines, 

 is a line which runs obliquely for some 

 distance and then extends in a longitudi- 

 nal direction for a short distance. The 

 lines are distinctly marked, but very 

 narrow. 



The uropoda are not longer than the 



terminal segment. The outer branch is narrower and shorter than 

 the inner branch, and is rounded at its posterior end. The inner 

 branch is obliquely truncate, with rounded post-lateral angles. Both 

 branches are provided with spines. 



The first three pairs of legs are prehensile and with propodus 

 unarmed; the last four pairs are ambulatory and armed with a few 

 spines. 



ROCINELA ARIES Schicedte and Meinert. 



Rocinda aries SCHICEDTE and MEINERT, Naturhistorisk Tidsskrift (3), XII, 

 1879-80, pp. 401-403, pi. xin, figs. 7-8. RICHARDSON, Proc. U. S. Xat. 

 Mus., XXI, 1899, p. 828; Ann. Mag. Nat. Hist. (7), IV, 1899, p. 170. 



Localities. Mazatlan; Lower California; Panama Bay; Gulf of 

 California. 



Body ovate; twice as long as wide; 10 mm.: 20 mm. 

 Head twice as wide as long; 2 mm.: 4 mm.; triangulate, with the 

 front produced over the basal articles of the antennae. Eyes large, 

 oval, composite, separated in front by a distance equal to the length 

 of one eye. Basal article of first antenna short, almost entirely con- 

 cealed b} T the front; second article about twice as long as the first; 

 third article one and a half times longer than the second. The flagel- 

 lum is composed of five articles. The first antenna? extend to the 

 middle of the fifth article of the peduncle of the second antenna or to 

 the antero-lateral angle of the first thoracic segment. The first article 

 of the second antennas is twice as long as the second article, which is 

 almost inconspicuous; the third article is twice as long as the first; 



