696 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



stiff hairs or bristles; the fifth joint is also produced at the outer distal 

 angle in an acute process. The fiagellum is composed of about seven 

 articles, rather indis- 

 tinctly defined; the last 

 article is tipped with 

 a bunch of hairs. The 

 buccal mass is very 

 prominent below. 



The segments of the 

 thorax are about equal 

 in length. The post- 

 lateral angles of all 

 the segments, except 

 the first, are produced 



backward, very slightly in the case of the second, 

 third, and fourth, but becoming gradually more so, 

 until the last two segments show this 

 character very markedly. 



The abdomen is narrower than the thorax. All the 

 segments are visible in entirety, not being covered 

 laterally bj r the last thoracic segment. The terminal 



FIG. 736. TRICHONISCUS PAPILLICORNIS. 

 UROPODA AND LAST SEGMENT OF ABDO- 

 MEN, x 77. 



FIG. 735. TRICHONIS- 

 CUS PAPILLICORNIS. 

 x 15. 



segment is triangularly produced, with the apex some- 

 what rounded. The uropoda 

 are short, styliform; the outer 

 branch is the stouter, and ex- 

 tends a little beyond the ex- 

 tremity of the inner branch. 

 Both branches are tipped with a 

 few hairs. 



Only a single specimen was 



obtained by the Harrirnan Alaska Expedition. It was found on the 



beach at Seldovia, Cook Inlet. 

 The type is in the U.S.N.M., Cat. No. 28772. 



127. Genus HAPLOPHTHALMUS Schobl." 



Body oblong, somewhat convex, sculptured dorsally with longitudi- 

 nal ribs. 



Head triangularly produced in the middle; lateral lobes large; front 

 scarcely defined from the epistome. Eyes small, simple/dorsally situ- 

 ated. Second pair of antennae short, nearly equal to one-third the 

 length of the body. Palp of maxillipeds obscurely composed of five 

 articles; epignath simple, lanceolate. 



FIG. 737. TRICHONISCUS PA- 

 PILLICORNIS. LEG OF FIRST 

 PAIR, x 15. 



FIG. 738. TKH-HO- 

 NISCUS PAPn.i.i- 

 CORNIS. UROPOD 

 OF LEFT SIDE. 

 X 77. 



See Sars for characters of genus, Crust, of Norway, II, 1899, pp. 166-167, and 

 Budde-Lund, Crust. Isop. Terrestria, 1885, p. 249. 



