1877.] CRUSTACEA, CHIEFLY FROM SOUTH AMERICA. 669 



segment), in the much smaller antero-lateral lobes of the head— from 

 I', granarus and P. liliputanus. Gay, from Chili, in the nearly equal 

 joints of the flagellum of the external antennsp-, &c. 



lu a smgle specimen from Peru, the terminal segment is transverse- 

 triangular, nearly of the form of that of P.poeyi, De Saussure, from 

 L.uba ; but as this exactly agrees with the other specimens of the 

 same series in other particulars. I do not regard this as more than 

 an individual peculiarity. 



PoRCELLio FLAvo-viTTATA, sp. n. (Plate LXVIII. fig. 4.) 

 More oblong in form, and a little more convex than the precedine 

 species, with the granulations upon the body more distinctly marked! 

 the sides of the body straighter. Colour blackish brown, variegated 

 as in the preceding species. Lateral margins of the segments of the 

 body with a marginal yellow band. Length 4 lines, breadth nearly 



Hab. Cayenne. 



This species is very nearly allied to the preceding; yet the 

 differences above mentioned appear generally constant. In one 

 specimen only, without antennae and uropoda, and which might if 

 m better condition, have proved distinct, is the lateral marginal 

 yellow band entirely absent. ° 



All the specimens are unfortunately much mutilated. 



b. Convex, with the antero-lateral lobes of the head prominent. 



PORCELLIO AZTECUS. 



Porcellio aztecus, De Saussure, Me'm. Soc. Phys. et Hist. Nat 

 Geneve. XIV. (part 2) p. 4/9, pi. v. fig. 38 (1858). 

 (1858) '«^^^^«'*"*' De Saussure, I. c. p. 479. pi. v. figs. 39, 40 



Hab. Peru (Lima). 



In the good series of specimens of this species in the collection, I 

 have observed between younger and fully-matured animals just the 

 differences that are instanced by De Saussure as existing between 

 P. aztecus and P.mexicanus, which I am therefore inclined to consider 

 difiFerent ages of one and the same species, well characterized by 

 Its large size, convex, finely and uniformly granulated body, the 

 prominent antero-lateral lobes of the head, the form of the terminal 

 segment, uropoda, etc. 



i/.Tf^''''/?u'r'"^u"',' ^'^^''' ^^^''^ ^'^ Novara, Crust, p. 136, 



1865) from Chih, which, on account of the prominent antero-lateral 



obes of the head, probably belongs to this section, differs in havin- 



recedb ^° "°'' '^S""^"^^ °^ *^^ b^^^^ "^^ch narrower than the 



Philougria, Kinahan*. 

 To this genus I refer a species obtained in Peru and Guiana, and 

 always occurring in the collection in the same tubes with Porcellio 



nlndl w"^ *° ^f'''- ^P^""" ^^t^ ^""^ Westwood=/^,«, Koch, a name em- 

 ploj ed by L,nn^us for a genus of plants. I regret that I have not mj^Tlf hTd 



Proc. ZooL. Soc— 1877, No. XLIV. 44 



