Dec, 1905.] Fall: Affinities of the Genus Tachycellus. 177 



of 1,000 feet more or less, while intermedins has occurred only at 



elevations of 5,000 to 7,000 feet in the Sierras. 



The Harpaline genera of our fauna allied to Tachycellus, viz., 



those which have the terminal joint of the labial palpus equal to or 



longer than. the preceding, and the penultimate joint bisetose in front, 



may be tabulated as below. The claims of Trichocellus, Glycerins 



and Amerinus to rank as distinct genera cannot be finally settled until 



a thorough study of the Harpali of both the Nearctic and Palearctic 



regions has been made. For the present their use will facilitate a 



clearer expression of the mutual relations of our own species and this 



in itself is a sufficient reason for their acceptance pending the broader 



study. 



Table of Genera. 



Penultimate joint of anterior and middle tarsi of male bilobed, the middle tarsi 



dilated ; presternum plurisetose at tip ; mentum not toothed , Stenolophus. 



Penultimate joint of anterior and middle tarsi simply emarginate, middle tarsi not or 

 feebly dilated in the male (except Tachycellus turbatus). 



Middle tarsi of $ biseriately squamulose Tachycellus. 



Middle tarsi of $ without, or with but few [Amerinus) squamules beneath. 



Body beneath sparsely punctured and pubescent, presternum plurisetose at 

 tip, antennae with three glabrous joints, males with pubescent spot or 

 spots at base of abdomen. 

 Upper surface completely glabrous, sutural stria of the elytra alone 

 impressed, the others feebly indicated or completely effaced ; dorsal 

 punctures wanting ; thorax without seta in posterior angle. 



Glycerius. 

 Upper surface with sparse fine pubesence ; elytra normally striate with 

 the usual single dorsal puncture, hind angles with setigerous punc- 

 ture Trichocellus, 



Body beneath glabrous and impunctate (except the prothorax in Amerinus). 

 presternum bisetose or non-setose at tip ; antennre with two glabrous 

 joints, males without pubescent spot at base of abdomen. 

 Mentum toothed, elytra with a single dorsal puncture, presternum non- 

 setose at tip. 

 Middle tarsi of $ without trace of squamules beneath, tooth of 

 mentum much shorter than the lateral lobes, elytra feebly sinu- 

 ate at tip Bradycellus. 



Middle tarsi of $ with a few squamules beneath, tooth of men- 

 tum as long as the lateral lobes, elytra strongly sinuato trun- 

 cate at apex Amerinus. 



Mentum not toothed, elytra frequently with several dorsal punqtures, 

 postemum either bisetose or non-setose at tip Acupalpus. 



The number of set;e at the tip of the presternum is a somewhat 

 useful character, being constant throughout each genus except Acu- 



