( 4 GEO. H. HORN, M. D. 



The sinuatioii of the elytral apex with the acute sutural angle is 

 not in our species of specific value, as in americana there is great 

 variability entirely independent of sex. 



Two species in those following are also found in Europe, and have 

 doubtless been introduced. 



The following table will assist in the identification of the species, 

 but the ornamentation is so variable that considerable latitude must 

 be allowed, as in americana specimens without vittae are quite common. 



Elytra coarsely punctate, more fiuely toward tlie apex; anteunie similar in color 



above and beneath 2. 



Elytra comparatively finely and equally punctate; antennae piceous above, pale 



beneath ; sides of elytra distinctly explanate xaiitlioiiielceiia. 



2. — Elytra with vittate markings 3. 



Elytra not vittate 6. 



3. — Elytra scarcely at all explanate; middle coxse distinctly separated by the 



mesosternum 4. 



Elytra distinctly explanate ; middle coxae contiguous 5. 



4. — Elytra very coarsely punctate, convex ; thorax more or less shining and 

 very indistinctly trimaculate; pubescence of surface (when present) erect. 



auiericaua. 

 Elytra less coarsely and more closely punctate, not very convex: thorax 



opaque, trimaculate ; pubescence recumbent sexvittata. 



5. — Sutural vitta indistinct or absent, the next inner vitta long, nearly reaching 



the apex Integra. 



Sutural vitta always distinct. 



The next inner vitta joining the sutural at, or behind the middle. 



iiotulata. 



The next inner vitta very short, basal iiolata. 



6. — Color red, head red 7. 



Color dirty yellow, brown or piceous, occiput usually piceous 8. 



7. — Elytra more coarsely punctured, the punctures with distinct intervals, sur- 

 face shining cavicollis. 



Elytra more finely and densely punctured, surface rather opaque. 



rurosaiiguiuea. 



8. — Middle coxae distinctly separated by a prolongation of the mesosternum; 



thorax angulate at middle and subsinuate posteriorly, with obtuse hind 



angles iiyinplitese. 



Middle coxae contiguous; hind angles of thorax distinct. 



Thorax irregularly punctate, with smoother areas along the apex and near 



the hind angles tiiberciilata. 



Thorax quite densely punctured and opaque decora. 



G. aiuericana Fab., Syst. Ed. i, p. 489; Oliv., Ent. vi, p. 636, pi. iii, fig. 

 43; Lee, Proc. Acad. 1865, p. 215; cribrata, conferta Lee, loc. cit.— Form oval 

 convex, of more pinguid facies than any other species, color dull yellow, elytra 

 each with three piceous vittae, more or less indistinct, or even wanting; surface 

 sparsely pubescent. Antennae piceous externally, paler at basal half. Head 



