AMERICAN COLEOPTERA. 139 



entirely absent. Prothoracic process broader at tip and emarginate and with 

 a feeble bidentate process from the middle of the emargination. 



Female.— Anterior margin of clypeus without the slender process; surface of 

 clypeus coarsely punctured and transversely wrinkled. Clypeal carina strong 

 nearly attaining the side margin of the head, vertical carina more elevated 

 curved backwards at its ends. Prothorax slightly protuberant at middle or 

 with a slight depression ou each side of the middle of the anterior margin. 



This species occurs abundantly over the entire rep;ion east of the 

 Rocky Mountains and varies in its development about equally in all 

 parts of that territory. Its size varies from .34 to .'JO inch, and at 

 the same time no varieties occur requiring special remark beyond the 

 generalities already given. 



O. Janus Panz., Orpheus T &nz., canadensis Fab-, striatulus Beauv., subeeneus 

 Bea-uv. .. icabricollis Khy., concinnus C ust., castaneus Me\s , cervicornis Khy.,pro- 

 tensus Mels., niger Mels. — Color variable, bronzed, greenish or cupreous, shining, 

 surface sparsely pubescent. Thorax sparsely and coarsely punctured, anteriorly 

 with a tendency to granulation. Elytra finely striate bi- or triseriately punc- 

 tate, Pygidium sparsely punctured, more densely and coarsely near the apex. 

 Body beneath greenish or bronzed, sparsely punctured. Length .30 — .16 inch ; 

 7.5 — 4 mm. 



Var. Orpheus Panz., canadensis Fab., etc. — Surface metallic green or bright 

 bronze, shining. Thorax sparsely and moderately coarsely punctured. 



Male. — Clypeal margin moderately reflexed, at middle slightly elevated and 

 subtruncate, surface of clypeus sparsely punctured. Clypeal carina nearly 

 obliterated. Vertical carina feeble at middle, elevated at each end in an acute 

 tubercle. Prothoracic process broader at tip deeply emarginate, angle diver- 

 gent and with a small tooth like process near the tip. 



Va7\ subaeueus Beauv. — Thorax and elytra metallic green, the latter at base 

 and apex yellowish, the former slightly granulated anteriorly. 



Male. — Clypeal margin at middle slightly elevated and not truncate. Verti- 

 cal carina at its ends elevated in a short horn. Thoracic process short broadly 

 emarginate at middle. 



Far. striatulus Beauv., ca.staneus M.e\s., scabricollis Kby. — Piceous or piceo- 

 testaceous, surface bronzed. Elytra paler at base and ajiex. 



Male. — Clypeus as in Orpheus. Vertical carina at extremities elevated into a 

 slender horn nearly as long as the height of the thorax. Thoracic protuber- 

 ance very small. 



The females of all the above varieties agree in having the clypeus 

 deeply punctured and transversely wrinkled, the clypeal carina strong 

 and attaining the side margin of the head, the vertical carina still 

 stronger and slightly arcuate or sinuate. The head of this species in 

 form agrees with the preceding and has a similar sinuation on each 

 side at the end of the clypeo-frontal suture. 



This species is widely diifused and varies so much in color and in 

 the degree of the development of the various peculiarities of the male 

 as to have caused it to have been described under so many different 

 names. It will be seen however that, as in Hecate, as the thoracic 



