302 GEO. H. HORN, M. D. 



B. — Mesoslernutn vertical between the coxse which it narrowly separates, not 



carinate in front. 



Hind angles of thorax distinct almost rectangular, humeri very little oblique, 



body feebly contractile. Clypeus slightly more prominent than 



the sides of the front. 



Elytra with moderately coarse punctures and six, more or less regular, striae 



on the disc. Thorax sparsely punctulate...sexstriatuni n. sp. 



Elytra with coarse punctures and but two feeble strise. Thorax smooth, 



impunctate bistriatiim n. sp. 



Elytra very irregularly punctate with coarse and fine punctures inter- 

 mixed. Thorax sparsely punctulate estriatum n. sp. 



Hind angles of thorax broadly rounded, body contractile. 



Clypeus prominent at middle. Elytra punctulate. ..repentinum n. sp. 

 Clypeus truncate at middle, entirely corneous. 



Elytra coarsely punctate eoncinnum Mann. 



Surface absolutely smooth. Elytra without sutural stria. 



rotuudnluin Mann. 

 Clypeus emarginate and partly membranous. Left mandible of male 

 prolonged. 

 Body feebly convex, finely and equally punctulate. 



angnlare Mann. 

 Body very convex and contractile. 



Surface very smooth, rarely with feeble trace of punctuation. 



politnm Lee. 

 Elytra distinctly punctulate, elytra with yellow oblique spots, some- 

 times however entirely piceous pulc'hrum Lee. 



Surface more evidently punctate, thorax punctulate. 



difforme Lee. 



A. oniscoides Beauv. — Body perfectly contractile, black or piceous, en- 

 tirely impunctate, smooth and shining. Thorax nearly twice as wide as long, 

 base and posterior portion of the sides continuously arcuate, apex deeply 

 emarginate the anterior angles broadly rounded. Elytra when viewed from 

 above almost truly circular in outline, the margin when viewed from the side 

 continuously arcuate without angulation, sutural stria very finely impressed. 

 Metasternum finely alutaceous, sparsely obsoletely punctulate, and with an 

 oblique elevated line on each side, the two meeting at middle, abdomen more 

 rugulose, sparsely pubescent. Mesosternum continuous with the metasternum 

 and obtusely carinate in front. Length extended .14 — .16 inch; 3.5 — 4 mm. 

 (PI. VII, figs. 11.12, 13). 



Male. — Anterior tarsi slightly dilated. Tarsi 5 — 5 — 4. 



Female. — Anterior tarsi slender. Tarsi 5 — 4 — 4. 



This species is so perfectly contractile that the legs are completely 

 hidden when in that state. The elevated line on the metasternum is 

 the posterior limit of a slight concavity which accommodates the 

 anterior and middle legs in contraction. 



A. glohatile Lee. is merely a smaller form. 



Occurs over the territory east of the Mississippi from Canada 

 to Georgia. 



