68 COLEOPTERA OF NORTH AMERICA. 



The species, thus far, are found only in the Atlantic district. 

 Edaphus possesses but one species, E. nitidus, from Louisiana; 

 it is remarkable for simulating in appearance a Pselaphide of the 

 tribe Euplectini. The head is marked with two deep fovea?, and 

 at the base of the thorax are three others. The upper surface is 

 smooth, and the elytra are slightly pubescent; the color is uni- 

 form, yellowish red.* 



Group III. — Megalopes. 



This group contains but a single genus, Megalops, having the 

 eyes yet larger than in Stenus, and the thorax coarsely, irregu- 

 larly punctured, and marked with a few lateral transverse furrows. 

 The antennae are inserted (as in the next tribe) under the lateral 

 'margin of the front, but are formed as in Stenus, except that they 

 have but ten joints; the tarsi are 5-jointed. 



Two species are known to me from the Atlantic district; they 

 are found under the bark of trees, and are very rare. 



Tribe VI.— OXYTELIXI. 



The prothoracic stigmata are covered by the inflexed portion 

 of the pronotum ; the anterior coxae are large, conical and promi- 

 nent; the second ventral segment is without any ridges. The 

 antennas are more or less geniculated, 11 -jointed, and are inserted 

 under the lateral margin of the front; the first joint of the max- 

 illary palpi is short. 



I would arrange our genera in three groups, as follows : — ■ 



Middle coxae at the sides of the breast. Oxypori. 

 Middle coxae contiguous, or nearly so ; 



Abdomen not margined. Osoeii. 



Abdomen margined. Oxyteli. 



Group I.— Oxypori. 



But a single genus is known, Oxyporus, found in fungi. The 

 head is very large, with the eyes small, not prominent, the man- 

 dibles long and decussating, not dentate; the mentum is armed 



* In a hind leg of this species, mounted by me in Canada balsam, there 

 is an appearance, under the lens of a compound microscope, that the first 

 joint of the tarsi projects beneath, in the form of a membranous lobe. This 

 structure is so anomalous in the present family, that I can scarcely believe 

 my eyes ; but not having the power of examining otlier specimens, I here 

 simply state the apparent fact, for the observation of future students. 



