AMERICAN C0LE01>TEIIA. 117 



synonymy. Full descriptions may be found by Ericlison, Insecten 

 Deutschlands, iii, 815; Harold, Berl. Zeitscber. 1S68, 338. 



Group E comprises species of variable form, color and size. Tbe 

 bead is distinctly tuberculate, clypeus sometimes bemibexap;onal or 

 broailly rounded, more or less deeply emarginate. Thorax distinctly 

 margined at base, sides rounded and not sinuate toward tbe apes. 



Our species may be known by tbe following list. 



Head heraihexagonal, clypeus rather deeply emarginate, ■with tlie angles on 

 each side of the eniargi nation, more or less prominent, never hroadly 



rounded , , , 1, 



Head usually broadly rounded, clypeus feebly emarginate and broadly round- 

 ed on each side, , ,.2. 



1. — Thorax black, elytra dark red; .29 inch. — Unalaschka -aleutus. 



Tiiora.t and elytra similar in color, black or piceous. 

 Form very robust; elytra scarcely one-fifth longer than 

 wide; clypeal teeth prominent; .18 — .20 inch; — Geor- 

 gia and Florida , , crassulus/ 



Form more elongate; clypeal teeth less prominent: 

 Mesosternum strigose, not punctured; .30 inch. — Alaska.ursinu-s. 

 Mesosternum punctured; .18 — .22 inch. — East of Rocky 



IMountains..,.< , ruricola. 



2. — Elj'tra rufo-testaceous, clouded; mesosternum strrgose ; .22 



inch. — Alaska congregatus. 



Elytra dark red ; .20 inch. — Middle States fcetidus. 



Elytra piceous-black, anterior angles of thorax and apices of 



elytra rufous; .29 inch.— Alaska , , .......arcticus. 



Elytra black, intcrsticesy especially at apex, finely alutace- 



ous; .22 inch. — Alaska..... ^-. , pectoralis. 



Of tbe above species arcticus and aleut us are unknaven to mo in 

 nature. These species have tbe mesosternum strigose, congregatus 

 ursinus and pectoralis, while iu the others it is rather coarsely punc- 

 tured, as far as I have had the opportunity of examining. The pro- 

 minence of the angles on each side of the clypeal emargination is sub- 

 ject to vary, and they may become rounded. In this case, the evi- 

 dences of age are always apparent, and the acuteness of the edge is al- 

 ways obliterated as well as tbe prominence of the angles desf.royed. 



A. aleutuS/ Esch. Enton>ograph. i, 1822, 27; Harold, Berl. Zeitschr. 18fi3, 

 372.— "Oblongo-ovate, moderately convex, shining black, anterior angles of 

 thorax and the elytra dark reddish. Head punctured, in front slightly rugu- 

 lose. Front trJtuberculate, clypeus emarginate at middle, gense moderately pro- 

 minent. Thorax with large and small punctures, sparsely punctured at middle, 

 more densely at the sides, bas-e on each side sub-sinuate. Elytra sub-crenately 

 striate, interstices flat, distantly sub-seriately punctured. Palpi piceous, an- 

 tennse rufous, club iufuscated. Body beneath piceous-black, feet rufo-piceous. 

 Length 3i lines." 



Unalaschka, Pintircly unknown to me. 



TRANS. AMKK. E.NT, SOC. (16) SEPTEMBER, 1S70. 



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