Coleoptera of the Falkland Islands. 177 



24. Listroderes lemniscatus } Quoy et Gaimard. 



Curculio lemniscatus, Quoy et Gaim. Voyage 'TTranie,' Zool. p. 549, 



t. lxxxii. tig. 4 ( 1824) \ 

 Cylydrorhinus lemniscatus, Guerin, Voyage ' Coquille,' ii. 2, p. 119 



(1830) v ; Rev. Zool. 1839, p. 304 3 . • 



Cylidrorhynus [lemniscatus], Guerin, Rev. Zool. 1839, p. 374 4 . 



Hob. Falklands [Malonines 3 ], Baie de Ohiens Marins 1 

 [Sea Dog's Bay] (Quo// et Gaimard). 



This insect, the type of Cylydrorhinus, Guer., must be 

 very like the one from Port Famine figured by Blanchard 

 in 1853 under the name C. lineatus, differing from it in the 

 more rounded sides of the prothorax and the narrowly albo- 

 lineate elytra. Guerin 3 gave the correct locality for it in 

 1839, a fact overlooked by subsequent writers. In the 

 enlarged Falkland map of the "Voyage of the ' Beagle ' " 

 there is shown a " Sea Dog Island " in W. Falkland, and the 

 Bay of that name is doubtless not far distant. 



25. Listroderes biangulatus, sp. n. 



Elongate, broad, robust, shining; nigro-piceous, the tarsi, 

 tibias, and antennae sometimes reddish ; above densely clothed 

 with narrow, sericeous, ad pressed, hair-like scales, which are 

 bronze-brown on the greater part of the surface, the head 

 and prothorax along the sides, the scutellum, and the suture, 

 a submarginal stripe, and the inferior margin of the elytra, 

 and sometimes several scattered spots on the disc of the 

 latter, with similar whitish or brownish-white seales, the 

 vestiture of the under surface sparser and paler, the ventral 

 segments 1-4 with a transverse pallid patch on each side; 

 the upper surface densely, finely, rugulosely, the under surface 

 a little more sparsely, punctate. Kostrum very stout, short, 

 widened outwards, sharply carinate down the middle, and 

 obliquely sulcate on each .side of this in front of the feeble 

 basal constriction, the scrobes limited above by a prominent 

 ridge. Antennae with joints 2-7 of the funiculus rapidly 

 diminishing in length, 5-7 strongly transverse. Prothorax 

 broad, short, uneven, biangularly explanate at the sides, 

 constricted ab the base. Elytra long, regularly convex, 

 oval, deeply punctato-striate, the interstices equal in width, 

 more or less arched, the apices sometimes obsoletely mucio- 

 nate. Ventral segment 1 excavate in the middle in £ . 



Length 13-14 (excl. head), breadth 6^-7 mm. ( c? ? .) 



