36 GEO. H. HORN, M. D. 



When fully colored this species is entirely piceous, but specimens 

 occur with the apical and basal margins of the thorax much paler, as 

 in kumeralis. 



This species is closely related to Immeralk, but differs in coloration, 

 the thorax is also longer, the jarosternum at tip of different form and 

 the outer carina of the sulcus is entire. In one % specimen, how- 

 ever, that carina becomes very feeble jjosteriorly, but the oblique 

 portion is well developed. 



Regarding this species there seems to be an amount of confusion 

 difficult to explain. From Bonvouloir's statement LeConte sent him 

 a specimen of this species as a type of humeralis, and Bonvouloir has 

 so described it. I susj^ect that LeConte sent one of those entirely pi- 

 ceous specimens mentioned by him (Trans. Amer. Philos. Soc. x, p. 

 420) in a paragraph not quoted by Bonvouloir. 



While in Paris, in 1874, my friend Salle gave me from his cabinet 

 one of three specimens from Louisiana labeled by Bonvouloir " ar- 

 duus," and on asking recently for information from Salle I have been 

 informed that Bonvouloir has also written on the label " se place 

 apres humeralis," which is true of the specimen, but not of " arduus.''' 

 Moreover, arduus belongs to the series with the coxal })lates narrower 

 externally. 



As Bonvouloir has certainly given wrong names to this and the 

 following species, I have been comi)elled to change the name to Bon- 

 vouloiri. 



Occurs in Pennsylvania, D. C. and Louisiana. 



11. Iiuiuerali^^ Say. — Form cylindrical, moderately robust, sliglitly nar- 

 rower behind, piceous, subopaque, elytra at base reddish, surface very sparsely 

 clothed with extremely short fulvous pubescence ; antennse rufo-ferruginous, as 

 long as half the body % , shorter 9 joints four to ten longer than wide and dis- 

 tinctly serrate % , or not longer than wide and not serrate 9 ; head coarsely 

 closely and roughly punctate, smoother at middle, slightly impressed above the 

 base of the clypeus, supra-antennal ridges well marked ; clypeus at base wide, 

 equal to the distance to the eye ; thorax longer than wide, sides parallel, arcuate 

 near the front angles, hind angles short, carinate ; disc convex, a feeble median 

 impressed line, surface densely, coarsely, roughly punctate ; anterior supplemen- 

 tary carina short, oblique, the posterior long and very nearly reaching the apical 

 margin ; juxta-sutural sulcus moderately wide, slightly broader and punctate 

 posteriorly, the outer carina abbreviated, extending to a point opposite the front 

 of the coxffi ; elytra vaguely striate, the intervals often slightly convex, surface 

 densely and roughly punctate ; body beneath piceous or brown, densely punc- 

 tate ; metasternal episterna narrow in front, slightly broader behind ; hind coxal 

 plates broad and jjarallel ; last ventral segment obtusely prolonged ; prosternal 



