283. 



BITOMA CRENATA. 



Order Coleoptera. Fam. Corticaridae Curt. 

 Xylophagi Lat. 



Type of the Genus, Lyctus crenatus Fab. 



BiTOMA Herb., Lat. — Lyctus Fab., Payk., Panz. — Ips Qiw. — Ditoma 

 Lat., Leach. 



AntenncE inserted before the eyes, on each side of and under the 

 clypeus, not much longer than the head, capitate and slightly 

 pilose; 11 -jointed, 1st and 2nd joints larger than the 3rd, the 

 former subglobose, the 3rd and 5 following subquadrate, gra- 

 dually increasing in diameter, the 9th larger, cup-shaped, the 

 1 0th and 1 1 th forming a compressed club, the former cup-shaped, 

 the latter suborbicular (6). 



Labrum rather transverse-oblong, the angles truncated and 

 ciliated (1). 



Mandibles not porrected, bent, acute, bifid at the apex, hollowed 

 externally towards the base, the internal margin cut out and 

 producing a ciliated membrane (2). 



Maxilke terminated by a rounded lobe, strongly ciliated with 

 bristles and a narrow lobe on the inside. Palpi short robust and 

 rather pubescent, 4-jointed, basal joint minute, 2nd obtrigonate, 

 3rd subquadrate, 4th as long as the others united, elongate- 

 ovate, compressed at the apex (3). 



Mentum transverse, sides convex, the angles acute. Labiiiin 

 long, cordate, the anterior margin ciliated. Palpi rather short, 

 inserted above the base of the lip, triarticulate, basal joint mi- 

 nute, 2nd rhomboidal, 3rd elongate-ovate, with a vesicle at the 

 apex (4). 

 Head obtuse. Eyes small remote, lateral. Thorax quadrate. Scu- 

 tellum minute. Elytra depressed, oblong, narrow and rounded at the 

 apex. Wings very ample. Legs short. Thighs incrassated. Tibiae 

 simple, furnished with very minute spurs at the apex. Tarsi alL 

 4-jointed, the \st joint subquadrate, 4th long subclavate. Claws 

 bent and acute (5). 



Ckenata Herb., Fab., Oliv., Panz., Payk., Lat. 



Rather dull black. Head and thorax covered with shallow punc- 

 tures ; antennse and margin of the clypeus pale castaneous. 

 Thorax with a slight channel down the centre and a curved line 

 on each side, forming an elongate oval area on the back, and 

 nearer each lateral margin is a longitudinal carina. Elytra with 

 a considerable portion of the base and apex bright ferruginous ; 

 5 longitudinal carinse on each with 2 rows of square punctures 

 between them, as if stamped. 



In the Author's and other Cabinets. 



