696 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



Fig. 730.— Trichoniscus p.\pillicornis. 

 Uropoda and last segment ok abdo- 

 men. X 77. 



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

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

 articles, rather indis- 

 tinctly detined; 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 



backw^ard, very slightly in the case of the second, 

 third, and fourth, ])ut becoming gradually more so, 

 until the last two segments show this 

 character very nlarkedl3^ 

 The abdomen is narrower than the thorax. All the 

 segments are visible in entirety, not being covered 

 laterally ])y the last thoracic segment. The terminal 

 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 Harriman Alaska Expedition. It was found on tht 

 beach at Seldovia, Cook Inlet. 



The type is in the U.S.N.M., Cat. No. 28TT2. 



Fig. 735.— Trichonis 

 cus papillicornis 

 X 15. 



Fig. 737.- Trichoniscus pa- 

 piLLicoRNis. Leg of first 

 PAIR. X 15. 



Fig. 73.S.— Tricho- 

 niscus papii.i.i- 

 CORNIS. Uropod 

 OF left side. 



X 77. 



127. Genus H APLOPHTH ALMUS Sch6bl.« 



Body oblong, somewhat convex, sculptured dorsally with longitudi- 

 nal riV)s. 



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

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

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

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

 articles; epignath simple, lanceolate. 



«See Sara for characters of genus, Crnst. of Norway, II, 1899, pp. 166-167, and 

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



