1ST3.] °«}< L Ho.r. 



A. basalis, Lee. Ann. Lye. V., p. 170 ; 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- 

 tures strongly arcuate at middle, and slightly prolonged along the basal 

 margin. Elytra moderately punctured, punctures coarser than those of 

 the thorax, marginal stria moderate. Pygidium shining, very sparsely 

 punctulate. Prosternnm as broad as long. Mesosternum with the stria 

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



The punctures 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. 620, pi. 14, No. 43, fig. 20 ; acupictm, Mars. loc. cit. p. 618, fig. 

 17. 



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

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

 long, slightly arcuate at middle, punctures at middle sulciform. Elytra 

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

 Pygidium smooth. Prosternum nearly as broad as long. Mesosternum 

 and metasternum smooth, suture indicated by a row of coarse punctures, 

 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 case 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 liue 

 of the former. 



Occurs principally in the Southern States. 



EXPLANATION OF PLATE V. 



Fig. 1. Hister seneomicans Horn. 

 " 2. Tribalister marginellus Lee. 

 " 3. Hetaerius morsus Lee. 

 " 4. Echinodes setiger Lee. 

 " 5. Paromalus mimeticus Horn. 



Fig. 6. Saprinus interstitialis Lee. 

 "7. " Copei Horn. 



" 8. " aequipunctatus 



Horn. 

 " 9. Teretriosoma chalybajum 

 Horn. 



