670 FAMILY XXX. DERODONTID.i;. 



12S5 (3S71). Bactridium striolatum Reitt., Yerbaud. des Nat. Vereius 

 in Bruun., XII, 1872, 14. 



Moderately elongate, snbdepressed. Uniform piceous or dark reddisli- 

 brown, antennjie and legs paler. Thorax slightly wider than long, sides 

 feebly curved and gradually narrowed behind the middle; disk rather 

 coarsely but not densely punctured, punctures of the middle forming a 

 vague U-shaped mark. Elytra slightly convex, surface striate, the striae 

 at sides replaced by sparse punctures, those on disk with fine, not closely 

 placed punctures; intervals finely wrinkled. Length 2 mm. 



Putnam, Posey tmd Jennings counties; scarce. April 13-No- 

 vember 20. Darker than the preceding, elytra more convex and 

 with the stria^ on sides semi-obsolete. 



Family XXX. DERODONTID.E. 



The Tooth-necked Fungus Beetles. 



Tliis is a very small family comprising only three known North 

 American species. They are small brown or dull brownish-yellow 

 beetles, in our species having the head deeply impressed, and with 

 a small, smooth tubercle on the inner side of each eye. This at first 

 sight resembles a large ocellus or simple eye. The name of the 

 typical genus, Derodonius, is derived from two (rreek words mean- 

 ing "neck" and "toothed," and was applied to these beetles on 

 account of their having the thorax nuich narrower than the elytra, 

 resembling a neck, and with the lateral margins strongly toothed. 



From allied families they are chiefly distinguished by having 

 the front and hind coxa" transverse ; the former conical, somewhat 

 prominent and contiguous; the latter slightly separated and dilated 

 on the inner side to form a small plate which protects the insertion 

 of the thigh. In addition they have the head suddenly but not 

 strongly constricted behind, the antennce 11 -jointed, inserted before 

 the eyes upon the side of the front, joints nine to eleven somewhat 

 larger than those preceding, except the first and second, which are 

 thicker ; abdomen with five free, equal ventral segments ; tarsi 5- 

 jointed, clothed beneath with long, gray hairs, the fourth joint 

 somewhat smaller than those preceding. 



Two genera comprise the family. One of these, 



T. Dkkooontus T;('c.. 1S()1. (Gr-., "neck I tooth") 



is represented in the eastern I'nited States and Indiana by the 

 single species: 



