REVISION OF ELEODIINT BLAISDELL. 483 



The tibia* are arcuate and each is somewhat rounded in basal half 

 and thence to apex somewhat compressed and distinctly but not 

 strongly dilated. 



The protibia^ are the most compressed and scarcely carinate exter- 

 nall}^, the tarsal grooves are evident but feeble and the posterior 

 border of each more prominent than the anterior. 



The tarsal orooves of the mesotibia; are the best developed, their 

 margins arc equal. 



The external surface of the metatibiie are flattened and more or less 

 grooved. 



The articular cavities of the protibiai are nearly open, on the other 

 tibiae they are shut off from the grooves by well marked but somewhat 

 atrophic edges. 



The relative lengths of the tarsi and also of their joints are quite 

 similar in the sexes. 



In the protarsi joints two to four inclusive are quite equal and 

 short, the first is longer than wide, the fifth about equal in length to 

 the preceding three taken together. 



In the mesotarsi joints two to four inclusive are subequal and short, 

 the first is scarcely as long as the second and third taken together, the 

 fifth is not as long as the combined lengths of the preceding three. 



In the metatarsi joints two and three are equal and together about 

 equal to the fourth ; the first is a little longer than the fourth. 



Tarsal formula : 



Pro. Meso. Meta. Metatibiae. 



Male.— 2 2^ 2?^ 4^ 



Female.— If 2* 23 4i 



Genus TROGLODERUS LeConte. 



Trnf/lodrnifi LeConte, N. Anier. Entomologist, I, no. 1, July, 1870, p. 2. 



Body elongate, rough, opaque, eyes slightly oblique; sides of the 

 frons moderately dilated, distinctly more prominent laterally than 

 the eyes; epistoma moderately dilated laterally, scarcely in the least 

 reflexed, margin arcuate laterally and emarginate anteriorly; labrum 

 moderately small, transverse, somewdiat short, sinuate, strongly re- 

 tractile beneath the epistoma ; mandibles not at all visible from above; 

 antenna? with the third joint as long as the two following combined, 

 eighth, ninth, and tenth distinctly transverse, somewhat perfoliate, 

 eleventh narrower than the tenth; mentum rounded in front, trape- 

 zoido-triangular to paral)olic in outline, surface more or less im- 

 pressed latei'ally; prothorax deeply emarginate in front, rounded at 

 the sides, then briefly and strongly constricted or simply sinuate, 

 apical angles stout and anteriorly prominent, basal angles small and 

 more or less prominent and acute, disc more or less foveate in the 



