216 MEMOIRS ON THE COLEOPTERA 



moderately rounded, broadly subdepressed posteriorly, the hind angles 

 obtuse; base feebly impressed at each side; elytra striate, the intervals 

 barely convex, the third unipunctate posteriorly; antennae and palpi 

 rufous, the former with joints 2-6 more or less nigrescent. Length 14.5 

 mm. Louisiana. 



The characters are taken from LeConte's description (Tr. Am. 

 Phil. Soc., 1853, p. 384); the only one mentioned which is of any 

 great comparative value is the size of the body, and this indicates 

 that the species should be placed next to brevicollis Chd., in the 

 above table. 



A. nitidipennis Lee. Oblong, rather narrower than agilis, shining, 

 obscure viridi-aeneous, the head and prothorax more obscure; head two- 

 thirds as wide as the prothorax, smooth, the frontal impressions puncti- 

 form; antennae with the three basal joints rufo-testaceous, the remainder 

 maculate with brown; prothorax somewhat narrowed behind, fully 

 one-half wider than long, quadrate, truncate at apex and base, the sides 

 rounded; hind angles obtuse, not rounded, scarcely explanate; surface 

 somewhat convex, the margin depressed; anterior transverse impression 

 deep, angulate, the stria fine, biabbreviated, the foveee linear; elytra 

 parallel, the apices only slightly sinuate, striate, the intervals accurately 

 flat, the third unipunctate, the marginal series of foveae interrupted 

 medially; under surface black, the legs and trochanters rufous. Length 

 7.5 mm.; width 2.8 mm. Georgia. A single specimen. 



There can be but little doubt that this species belongs near 

 cephalus and tenuitarsis , which together form a very isolated 

 section of the genus, but in neither of them could the anterior 

 margin of the prothorax be described as truncate; the sinus is 

 distinct and well developed, though only moderately deep. The 

 coloration of the antennae, also, seems to be different; the joints 

 beyond the third in cephalus and tenuitarsis, have a faint blackish 

 slender line along the middle of the flattened sides, as is often the 

 case in other unrelated forms, but this would hardly suit the 

 language of the description. LeConte states that nitidipennis is 

 related to agilis, which is clearly not the case with the two species 

 mentioned. 



A. flebilis Lee. (Eurytrichus). Oblong, piceous-black, somewhat 

 shining; prothorax more than one-half wider than long, equally narrowed 

 anteriorly and posteriorly, the sides rounded, oblique posteriorly, the 

 hind angles obtuse, not at all rounded; surface feebly impressed at each 

 side of the base; elytra slightly wider than the prothorax, finely striate, 

 the second stria unipunctate posteriorly; antennae, palpi and legs piceo- 

 rufous. Length 8.8-10 mm. Lower California (Cape San Lucas). 

 Quite distinct from our other species by the form of the prothorax; the 

 sides behind are scarcely perceptibly flattened. 



