NATURAL SCIENCES OF PHILADELPHIA. 21 



Aa. Pubescent. pubescens. 



Ab. Glabrous. 



Ba. Elytra siibtruncate, legs nearly black. 



Ca. Elytra bi-impressod, thorax Ibveolate inside the callus. 



confusa. 

 Gb. Thorax nearly smooth. torosa. 



Bb. Elytra rounded, scutellum pilose. 



Ca. Thorax more or less rugulose, basal groove not defined. 

 Da. % 9 posterior femora dentate. 



Ea. % pygidium emarginate, legs black, thorax 



sparsely punctulate. emarginata. 



Eb. Thorax rugulose, legs more or less red. 



Fa. Antennae with the 2d and 3d joints equal. 



pyritosa. 

 Fb. 3d distinctly longer than 2d. cuprea. 



Bb. 9 femora simple. 



Ea. Thorax rugulose, with smooth reliefs, legs red. 



femoralis. 

 Eb. Thorax with disk smooth, dorsal channel visible, 

 legs nearly black. metallica. 



Cb. Thorax convex, dorsal and basal grooves marked, legs 

 red. 



Ba. Thorax less convex, rugulose. flavipes. 



Bb. Thorax convex, punctate. jucunda. 



Be. Thorax very sparingly punctate. Kirbyi. 



For a full description of these species the reader is referred to 

 Leconte's synopsis, in the Proceedings of the Acaderaj^ for 1852. 

 Several species therein described are here marked as varieties, 

 possibly in some cases incorrectly; but I have included only 

 those species that I could definitely tabulate out, and rejected all 

 others. The synonymy thus introduced will stand thus : D. 

 rufescens = pulchella = lucida ; D. congener = alutacea = pisca- 

 trix; D. confiuens=fulgens=^s\x\)\A\is\ D. aurifer = dives =pu- 

 silla^cuprea, ] D. geniilis ^metuWica; D. sidcicollis^D. Kirbj'i. 

 I am unable to add anything about the doubtful species, of which 

 types must be compared ; of species described since, D. Cali- 

 /ornica =proxima, D. junci=emavginsita, and D. pubescens will 

 be found above. 



D. pubicollis, sp. n. 



Narrow, elongate aeneous; legs pale-red, under surface silvery; 

 head, thorax, and scutellum cinereous, pubescent; eyes prominent ; 

 thorax longer than broad, callus not well-marked, surface puuctu- 



