IT. C. FALL. 181 



( 'nmpta — Does not appear to be separable from small dark speci- 

 mens of expansa : being indeed fairly intermediate between ordinary 

 expansa and the Atlantic Coast form. The unique type is from San 

 Diego. 



Grata. — Described from a single male specimen from Lake Supe- 

 rior. This specimen is quite dark and a little more slender than 

 usual, but neither the description nor an examination of the type 

 yields anything further. 



There are before me two or three other forms as worthy of names 

 as the above, but like them, aside from some trifling variation in 

 size and color, the differences seem to be almost confined to the out- 

 line and relative proportions of the elytra and prothorax. 



' What these variations may mean is a problem, the satisfactory 

 solution of which will, I believe, severely test the acumen and 

 patience of the future monographer. For the present it will be quite 

 difficult enough in many individual cases to decide to which of the 

 two species here recognized a given specimen may belong; small 

 eastern males of amerieana and well-developed females of cavicollis 

 being strikingly similar. 



The names amerieana and cavicollis are used in the sense in which 

 they were understood by LeConte and Horn, and it is probable that 

 they had correctly interpreted Mannerheim. Americana, as here 

 defined, in very widely dispersed. Specimens have not been seen 

 from either the New England or Gulf States, but it is certain that 

 it occurs in the latter region. In general its range is more southern 

 and western, while that of cavicollis is northern and eastern. 



M. ostvicollis Man ii. --Short, ovate, convex, color variable, but most com- 

 monly, when mature, with the head and prothorax rufotestaeeous or ferruginous, 

 the elytra darker — fuscotestaceous or brownish, body beneath darker, tip of 

 abdomen paler, legs and antenna?, testaceous, the outer joints of the latter darker. 

 Pubescence, rather short, recumbent. Head sparsely, finely punetulate; eyes 

 rather small, prominent, separated on the front by more than twice their longest 

 diameter; tempora very short but discernable. Antennse nearly reaching the 

 hind angles of the pionotum, all joints longer than wide, the tenth sometimes 

 scarcely so. Prothorax transverse, subcordate, strongly rounded in front, straight 

 posteriorly; the margin usually finely crenulate posteriorly, the hind angles 

 marked by a prominent denticle; surface evenly punctate, the punctures rather 

 fine and separated by from one to two times their own diameters; basal fovea 

 deep, a little transverse. Elytra rather broadly ovate, base but slightly wider 

 than the contiguous base of the prothorax, rather strongly expanded at the 

 humeri, usually distinctly widest before the middle in the male, more nearly at 

 the middle in the female; apices not truncate; strise scarcely impressed, punc- 

 tures moderate, those of the interspaces finer. Presternum with a few vague 

 punctures before the coxa? and along the front margin, and others more sharply 

 impressed in the transverse fossse and along the posterior margins at the sides 



TRANS. AM. ENT. SOC. XXVI. DECEMBER, 1899. 



