410 INSECTA. 



B. capucinus. Five lines in length, with a red abdomen and elytra of the 

 same colour. Very common in old wood in timber yards. 

 The second genus of this division, or 



MONOTOMA, 



Is distinguished from the first by the solid and globuliform club the tenth 

 joint of the antennae. 



The body is elongated, depressed, and frequently forms a parallelepiped; 

 the anterior part of the head is narrowed, and projects somewhat in the 

 manner of a triangular and obtuse snout. The palpi are very small, and, 

 as well as the mandibles, not salient. 



3. The Xylophagi of the third division have eleven very distinct 

 joints in the antennae; their palpi are filiform, or thicker at the ex- 

 tremity in some, and smaller in others; all the joints of the tarsi are 

 entire. 



Those in which the club of the antennae consists of but two joints form 

 the genus 



LYCTUS. 



In Lyctus proper, the margin of the head covers the whole or greater part 

 of the first joint of the antennae. The mandibles are not salient. 



In the other Xylophagi with antennae composed of eleven joints, the 

 three or four last form the club, or the last is alone larger than the preced- 

 ing ones. They are subdivided thus: 



Sometimes the mandibles are covered or project but little, as in 



MYCETOPHAGUS, Fab. 



In Mycetophagus proper, the club of the antennae commences at the sixth 

 or seventh joint; the last ii almost ovoid. 



There are several subgenera, such as Triphyllus, Dasycerus, Silva- 

 nus, &c. 



Sometimes the mandibles are entirely exposed, salient and robust. The 

 body is generally elongated, narrow and depressed. These Insects form 

 the genus 



TROGOSITA, Oliv. 



In Trogosita proper, the mandibles are shorter than the head and crossed; 

 the ligula, almost square, is not prolonged between the palpi, and the 

 maxillae have but a single lobe. 



