﻿280 LE CONTE SYNOPSIS OF THE 



aeneo-testaceis, fusco-seneo vel seneo-viridibus, confertim rugose punctatis margine testaeeo, tibiis posticis 



ad apicem, tarsisque nigricantibus. Long. -34 — 41. 

 Burin, Lainell. 2, 2nd, 74. 



Melolontha linearis Gyllenhal, Schonherr, Synon. Ins. 3, 103. 

 ( Dichelonyclia Baclcii Kirby, Fauna Bor. Am.'J Burm. Lamell. 2, 2nd. 



Middle States and Lake Superior. When the hair of the thorax has been removed, 

 as is sometimes the case, this species may be known by the very dense, but not fine 

 punctures of the thorax, the base of which is wider than the apex, and the -sides angu- 

 lated at the middle. There appears to be a variation in the form of the basal angles, 

 sometimes they are subacute and moderately prominent, sometimes rectangular, and 

 sometimes obtuse ; they are never very acute and prominent as in D. elongata. It is 

 possible that by comparing specimens from different localities several closely allied 

 species here confounded together may be separated. 



One female from Maryland has the posterior angles more prominent, and the elytra 

 of a dull brownish bronze color. The thorax appears more coarsely punctured, but 

 it is unsafe to propose a new species upon this single specimen. 



5. J), fulgida, picea, elongata, capite thoraceque piceis vel piceo-rufis, illo tenuiter marginato confluenter, 



hoc fortius medio minus dense punetato, pilis grossis seneo-flavis dense vestito, lateribus subangulatis, 



postice oblique subsinuatis, angulis posticis subrectis, elytris fortiter punctatis, vix trilineatis, breviter 



pubescentibus, viridiaeneis, vix lineatis, margine testaceis, antennis pedibusque flavis, tibiis tarsisque 



infuscatis. Long. -37. 



Steilacoom, Washington Territory, Dr. Suckley. Allied closely to the preceding, 



but the thorax is less densely and more strongly punctured, less suddenly angulated 



on the sides, and less narrowed behind, and the reflexed margin of the clypeus is very 



narrow. 



6. D. B a c k i i , nigro-picea, elongata, capite confluenter punetato, fortius marginato, thoraee fortiter sat 



dense punetato, spatio utrinque sublsevi (dense fortius pubescente ?) lateiibus rotundatis subangulatis, 



angulis posticis obtusis, elytris laete viridiseneis, margine testaceo, rugose punctatis sublineatis, antennis 



pedibusque nigro piceis, his rufo-tinctis. Long. -33— 39. 



Kirby, Fauna Bor. Am. 4, 134, tab. 2, fig. 6. 

 North side of Lake Superior. Burmeister places this as synonymous wjth D. linearis ; 

 my specimens are however clearly different, not only by the dark colored antennae, 

 but by the more strongly margined clypeus, and by the more coarsely and less densely 

 punctured thorax ; on each side of the disc anteriorly, near the lateral fovea is an 

 indistinct space which is less punctured ; the sides are less angulated, and not at all 

 sinuate behind. The specimens were found floating in the lake, and had lost nearly 

 all the pubescence ; from the appearance of what remains on the side of the thorax, 

 I believe that the hair was coarse and probably dense as in D. linearis. Kirby does 

 not mention this character, but it may have been lost in the alcohol in which the 

 specimens were preserved ; the hair of the under surface, being better protected, has 

 been preserved in both his specimens and mine. 



