COLEOPTERA. 517 



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 preceding ones. They are subdivided thus: 



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



MYCETorHAGus, Fab. 



Hei:e, the antennae, hardly longer than' the head, are inserted under 

 the projecting margin of the head, and terminated abruptly by a tri- 

 articulated, perfoliate club. 



• CoLYDiuM, Fab. 



Their body is linear, and the head very obtuse before; the thorax 

 is as wide as the abdomen, and forms a square m.ore or less long; 

 the abdomen is elongated. The two first joints of t*he antennae are 

 larger than the following ones, which, to the eighth inclusively, are 

 very short and transversal(l). 



There, the antennae are at least as long as the thorax. 



The body is oval, the thorax transversal and widest posteriorly; 

 the first and last joints of the tarsi are elongated, and the antennae 

 terminate in a perfoliate club, either oval and commencing near the 

 sixth or seventh joint, or abrupt, somewhat oval, and formed of the 

 three last. 



They live in mushrooms or under the bark of trees. 



Mycetophagus, Fab. — Tritoma, Geoff. 



In Mycetophagus proper, the club of the antennae commences at 

 the sixth or seventh joint; the last is almost ovoid(2). 



Triphyllus, Meg. Dej. — Mycetophagus, Gyll. 



Where the club of the antennae is shorter, abrupt, and formed by 

 the three last joints only; the last one is almost globular(3). 



Those have an oblong body and the thorax narrower than the 

 abdomen, at least posteriorly; the first joint of the tarsi is the length 

 of the following one, or hardly longer, and the antennae are termi- 

 nated by a narrow elongated club, but slightly or not at all perfoliate, 

 formed by the three last joints. The 



(1) See Lat., Fab., Dej. 



(2) See Lat., Gener. Crust, et Insect., Ill, p. 9, first division of the Myceto- 

 phagi; and Gyll., Insect. Suec, I, iii, 387, and IV, 630. 



(3) See Lat., Ibid., second division; Dej., Mycetophagi, and Gyllenh., Ibid., 

 IV, 631. 



