NORTH AMERICAN COLEOPTERA. 29 



color than the pronotum. Abdominal segments very strongly margined 

 throughont, finely reticulated, feebly convex, somewhat shining. First and 

 second joints of posterior tarsi equal in length, together as long as the last, 

 third joint much shorter than the first. Prosternum impunctate. 



Male. — Fifth ventral segment very feebly and roundly emarginate in the 

 middle at the apex ; sixth segment narrowly and deeply sinuate at apex. 



Female. — Sixth segment rounded behind. 



Length 1.0-1.2 mm. 



Sand Point, Tampa, and Cedar Keys, Florida ; seven specimens. 



Tlie above description was drawn from a female, the males being 

 defective ; there seems to be very little sexual difference, other than 

 that observed in the abdominal segments, and a slightly more slender 

 form. The species is very distinct and one of the smallest of the 

 genus. 



The mentum in Euresthetus is perfectly plane or very feebly undu- 

 lated on the exposed surface, and is not, like Stenus, ornamented with 

 a very conspicuous triangular cariniform elevation. 



EDAPHUS Lee. 



Dr. LeConte's description of the only species hitherto known in 

 this genus, runs as follows (Smith. Misc. Coll., 'G3-'66, p. 50). 



£. IlitidllS. — Testaceus nitidus, glaber, laevis capite bi-impresso, thorace 

 latitudiue fere breviore, subcordato postice angustato, ante basin foveis 4 

 magnis insculpto ; elytria stria suturali vix conspicua. Long .04 (inch). 



Alabama and Louisiana. 



In the course of the remarks made upon this species, the author 

 states that the genus differs from Euaisthetus principally in the 

 smooth impunctured body. Since it is seen tliat we have species of 

 Euaesthetus, which are almost impunctate, more so in fact than the 

 two new species of Edaphus, to be subsequently described, it seems 

 preferable to state the ditierence between Edaphus and Euajsthetus as 

 follows : — 



In the former the head between the eyes is strongly bi-impressed, 

 the labrum is not provided with teeth, the prothorax has several deep 

 foveae along the base, and the dorsal surface of the first ventral seg- 

 ment has a very narrow acute medial cai'ina throughout the anterior 

 half of its length ; while in Eusesthetus the comb-like row of teeth 

 of the labrum is a very marked feature, the head between the eyes is 

 perfectly even and convex, there is no transverse row of foveae near 

 the base of the pronotum, and the dorsal carina of the first ventral 

 segment is totally absent. 



