1573.] oOi iHoiT. 



A. basalis, Lee, Ann. Lye. V., p. ITO ; Proc, Acad. 1853, p. 290. 



Oval, moderately convex, piceous, shining. Head sparsely and finely 

 punctulate. Thorax moderately punctured at base with a row of punc- 

 tui'es strongly arcuate at middle, and slightly prolonged along the basal 

 margin. Elytra moderately punctured, punctures coarser than those of 

 the thorax, marginal stria modei'ate. Pygidium sliining, very s^iarsely 

 jjunctulate. Prosternum as broad as long. Mesosternvun with the stria 

 interrupted, metasteraum sparsely puuctured. Length .04 inch ; 1 mm. 



The i^unctures forming the arcuate line of the base of the thorax are 

 longitudinally prolonged, and the base of the thorax is apparently sulcate. 



Occurs in the region near Fort Yuma, Cal. 



A. simplex, Lee. Bost. Journ. V., p. 84, pi. 5, fig. 11 ; Mars. Mon., 

 1856, p. 630, 1)1. 14, No. 43, fig. 20; acupictus, Mars. loc. cit. p. 618, fig.^ 

 IT. 



Oval, biownish, moderately convex, shining. Head minutely punctu- 

 late. Thorax sparsely and finely punctured, basal row of punctures 

 loug, slightly arcuate at middle, punctures at middle suleiform. Elytra 

 sparsely punctulate, punctures tine and aeiculate, marginal stria fine, 

 Pygidium smooth. Prosternum nearly as broad as long. Mesosternum 

 and metasternum smooth, suture indicated by a row of coarse i^unctures, 

 coarser at middle. Length .04 inch ; 1 mm. 



I have carefully compared the types of Marseul and Leconte, and find 

 them identical, although simplex is said by Marseul to have a narrower pro- 

 sternum. This is certainly not the ease in any specimen examined by me. 

 This and the preceding species are closely allied, but differ in the thoracic 

 and elytral punctuation and also by the more strongly arcuate basal line 

 of the former. 



Occurs principally in the Southern States. 



EXPLANATION OF PLATE V. 



Fig. 1. Hister jeneomieans Horn. 

 " 2. Tribalister marginellus Lee. 

 " 3. Hetajrius morsus Lee. 

 " 4. Echinodes setiger Lee. 

 " 5. Paromalus mimeticus Horn. 



Fig. 6, Saprinus interstitialis Lee. 

 "7. " Copei Horn. 



" 8. " asquipuuetatus 



Horn. 

 " 9. Teretriosoma chalybteum 

 Horn. 



