Nausibius.] CLAVICORNIA. 303 



NAUSI3IUS, Kedtenbacher. 



One or two species only are included in this genus ; they differ from 

 Silvanus by the somewhat indistinctly 4- jointed club of the antennae ; 

 Westwood (Classific. i. 153) says that the larva of our species may often 

 be found dead in sugar, and observed floating in tea or coffee ; it is elongate, 

 depressed, and glabrous, with the central abdominal segments rather 

 broader and the terminal segment entire. 



N. dentatus, Marsh. Fuscous-brown, elongate, subparallel, de- 

 pressed, rather dull, clothed with very fine yellowish pubescence; head sub- 

 triangular, eyes large and prominent, placed close to thorax, antennae short 

 and stout with somewhat indistinct 4-jointed club ; thorax subquadrate, 

 slightly narrowed behind, very little longer than broad, scarcely narrower 

 than elytra, with sides furnished with six rather blunt distinct teeth ; 

 elytra almost three times as long as thorax, with fine punctate stria?, 

 alternate interstices, especially the external ones, somewhat raised. L. 

 3 mm. 



In sugar, &c. ; an introduced species ; London and other towns in different parts of 

 the kingdom ; not uncommon. 



SILVANUS, Latreille. 



This genus contains between twenty and thirty species, which are 

 widely distributed, but as in the case of Lsemophloeus their original dis- 

 tribution cannot be known with any certainty, as several of them are 

 almost cosmopolitan, having been carried from one quarter to another by 

 commerce ; the same holds good also with regard to Cathartus and 

 Nausibius ; the habits of these genera are, however, somewhat of a pro- 

 blem, as occasionally (as also is found in the case of Carp< philus) species 

 supposed to have been imported are found by sweeping or under bark 

 under circumstances that seem to prove them to be indigenous. 



The larva of Silvanus unidentatus is described and figured by Ferris, Ann. Fr., 1853, 

 p. 627, pi. 19, fig. 138 ; it is of a whitish colour with the head and thorax darker, 

 and calls for no particular description, being linear and subparallel with the head 

 transverse ; the ninth segment of abdomen is small and narrow, and bears no cerci ; 

 the larva is rather active ; the pupa has the last segment of abdomen narrow and ter- 

 minated by two short cerci; Westwood (Classific. i. 153, fig. 13, 10, 11) figures 

 the larva and pupa of S. surinamensis ; the larva is rather stout and broad, and the 

 pupa has the margins of the abdomen and thorax armed with short thick points. 



I. Cheeks large, and projecting behind eyes, which are re- 



moved to a distance from thorax ; sides of thorax serrate, 

 anterior angles not or scarcely more produced than the 

 preceding denticulations S. STTKINAMENSIS, L. 



II. Cheeks behind eyes slightly projecting in a very small 

 tooth, eyes close to thorax ; sides of thorax not serrate, 

 anterior angles much produced and projecting. 



i. Slightly shiny ; thorax longer than broad ; anterior 



angles produced iu a short point S. TTNIDENTATUS, OL 



