﻿MBLOLONTHID^} OF THE UNITED STATES. 267 



II. 



2. D. subcostata, fusco-ferruginea, nitida, oblonga, convexa, capite hemihexagono, grosse punctato, 



margine reflexo, antice vix emarginato, thorace parcius punctato, lateribus medio valde rotundatis, 

 angulis omnibus acutis vage impressis, elytris grossius punctatis, tricostatis, tibiis anticis subtridentatis ; 

 sutura frontali profunda utrinque exaraba, vertice late convexo. Long. -39 — *45. 

 Blanch. Cat. Col. Mus. Paris, 171. 



Georgia; not rare. Varies a little in the outline of the thorax, and in the depth 

 of the punctures ; it is however always obtusely rounded at the middle, sinuate before 

 and behind, with acute angles. 



3. D. liberta, nigro-picea nitida, oblonga, convexa, capite hemihexagono, tenuiter marginato, fortiter 



punctato, antice baud emarginato, tborace fortiter baud dense punctato, parcius in medio, lateribus medio 

 rotundatis, angulis anticis subacuminatis, posticis obtusis haud rotundatis, omnibus paulo impressis, 

 elytris fortius punctatis, concinne tricostatis, tibiis anticis tridentatis, sutura frontali profunda, vertice 

 planiusculo. Long. -45 — -5. 



Burm. Lamell. 2, 2nd, 261. 



Melolontha liberta Germ. Ins. Nov. 123. 



Middle and Southern States ; D. tristis Kirby, placed by Burmeister as synony- 

 mous with this species, is quite distinct, having a thickly punctured thorax, of a 

 different form. 



4. J), brevicollis, oblonga, convexa, piceo-ferruginea nitida, capite punctato, hemihexagono, antice late 



emarginato, margine anguste reflexo, sutura frontali profunda, thorace brevi subtilius punctato, lateribus 

 oblique rotundatis, angulis anticis subacutis posticis fere rectis, omnibus impressis; elytris subtilius 

 punctatis et tricostatis, tibiis anticis obtuse tridentatis. Long. -47. 



One specimen collected by George Gibbs, Esq., at Steilacoom, Washington Ter- 

 ritory. 



5. D. tristis, oblonga, minus convexa, nigra subnitida, capite dense punctato hemihexagono, antice 



subemarginato, margine anguste reflexo, sutura frontali profunda, thorace lateribus oblique rotundatis, 

 angulis anticis subacutis, posticis obtusis, omnibus paulo impressis, elytris punctatis, tricostatis, tibiis 

 anticis obtuse tridentatis. Long. -43 — *53. 

 Kirby, Fauna Bor. Am. 130. 



Middle States and Lake Superior, not rare. 



III. 



6. D. excavata, oblonga, nigro-picea, nitida, capite vix hemihexagono, margine reflexo antice fererotun- 



dato, grosse, occipite parcius punctato, sutura frontali profunde excavata, fronte transversim carinata, 

 medio subimpressa, thorace grosse punctato, antice posticeque versus latera transversim excavato, lateri- 

 bus medio rotundatis angulis anticis subacuminatis, elytris rude punctatis, subcostatis, tibiis anticis 

 subtridentatis. Long. -35. 



One specimen, Georgia. The punctures of the elytra are large, and sometimes 

 confluent, they are mostly arranged in rows, except towards the suture, and the three 

 costse are not much more evident than the other intervals. 



