AMERICAN COLEOPTERA. 251 



III. — Body more compact and broader; prothorax with sides bent about the 

 middle, then parallel to the base, hind angles rectangular. 



Costse of elytra sinuous, interspaces cribrate 3. cribratliisi. 



Costse of elytra straight, interspaces flat, smooth, third and fourth costse 

 distinct, and a shorter sui>plementary lateral one, sides of jirothorax 



angulated 4. sculptu!^. 



Similar to sculpius, but sides of prothorax oblique, not angulated. 



5. obliqiiiis, n. sp. 

 Costffi of elytra straight, interspaces flat, smooth, third costa wanting. 



6. costal US. 



1. M. liif icollis, Miiklin, Bull. Mosc. 1853, ii, 199. 



Alaska ; types kindly seat me by Prof. Miiklin and Baron Chaudoir. 

 Found abundantly on the north shore of Lake Superior by Messrs. 

 Hubbard and Sohwarz; and in New Hampshire by Mr. E. P. Austin. 

 The prothorax is wider at base in % than $ , the sides being some- 

 what curved inwards in the latter. 



2. M. piiiictatns, Lee. List of Col. X. Am. 1863, p. 26 ; M. r.ostalus 1| Maklin, 

 Bull. Mosc. 1852, ii, 325. 



Described from Alaska ; two specimens were collected by Mr. 

 Crotch, at San Diego, California, which agree sufficiently with Prof. 

 Miiklin's description. 



This species is intermediate in form between the preceding and 

 following. The prothorax is much narrowed in front, with the sides 

 oblique, from the tip to the middle, where they are strongly angulated ; 

 they then converge slightly to the base, and have a small tooth half 

 way between the side angle and the base ; the basal angles are obtuse 

 in outline, but acutely cuspidate at tip. 



The third costa of the elytra is abbreviated behind, and widely 

 separated from the fourth. 



3. M. cribratus, Lee. New Spec. Col. 60. 



Georgia, one specimen. Easily known by the irregularly flexed and 

 sinuous costae of the elytra, and the very coarsely cribrate interspaces. 

 The sides of the prothorax are oblique in front, strongly angulated at 

 the middle, then parallel, with a small cusp half way between the side 

 angle and the basal angle, which is rectangular, and not rounded. 



4. .M. Mi'iilptiis, Loc. New Spec. Col. 60. 



One sjieciuicn, Georgia. Without close examination this and the 

 next species might be confounded with M. costdtus, on account of the 

 elytral interspaces being wide and nearly smooth, on comparison how- 

 ever, it will be seen that the ridges are not so acute, the usual third 

 costa is present, and abbreviated behind; the fourth is entire; on the 



