1856.] 31 



Say, J. Acad. 3, 455. Harris, Ins. 2nd edit. 117. 



Chrysomela trimaculata Linn. Syst. Nat. 2, 592. Fabr. Ent. Syst. 312. Fabr. 

 El. 1, 424. Oliv. Ins. 91, 515, pi. 3, fig. 29. Coquet. 111. 3, 123. 



Chrysomela clwicollis Kirby, Faun. Bor. Amer. 213. 



Locality. Middle States, Southern States and Nebraska. 



Antennae and palpi black ; elytra punctured in double lines, which become 

 confused near the tip ; a dilated black band extending in breadth from near the 

 base to the middle, not attaining the lateral edge, and often interrupted in the 

 middle of each elytron ; under surface black, feet purplish. 



TiMARCHA Redt. 



Palpi slightly thickened with the last joint, oval, truncate and a little longer 

 than the preceding ; tarsi with the second joint not smaller than the first or 

 third ; ungues simple approximate ; coxee of anterior feet moderately, of the pos- 

 terior widely separated; tibiae rounded at the extremity, not sulcate. Body ob- 

 long, very convex, black scabrous, with confluent impressed punctures, which 

 are coarsest upon the elytra ; the latter are united. 



T. intricata. Head irregularly and strongly punctured, thorax with large 

 scattered punctures, the interstices tolerably densely punctured, transverse, 

 more than twice as long as broad ; apex broadly emarginate, base subsinuate, 

 basal angles rectangular ; elytra with large confluent punctures, the interstices 

 with fine scattered punctures ; under surface coarsely, feet finely punctured. Tab. 

 1, fig. 1. 



Length -40. 



Hald. Proc. Acad. 6, 363. 



T. intertexta Hald. Ibid. 



Locality. Oregon and northern California, Dr. Townsend and Mr. Child. 



T. intertexta I regard as a variety of intricata, with the elytra a little 

 more rugose. 



Ohtsomela Linn. 



Palpi with the last joint not longer than the preceding ; tarsi with second joint 

 smaller than the first and third ; ungues simple ; coxec of anterior feet moderately 

 or slightly, those of the posterior widely separated. The body varies in form 

 from rounded to oval, and even to elongate ; it is usually winged, but apterous 

 in only one American species ; the paljji vary in form, having the last joint in many 

 thick and dilated, and in others slender; thorax always broader than long, some- 

 times equally convex, sometimes with the lateral margin broadly thickened. The 

 sculpture of the elytra varies ; some are very finely and confusedly punctured 

 with labyrinthine rows of larger punctures limiting spots of different colors, while 

 in others the punctures are arranged in nine regular striaj with a short one at the 

 scutellum. The mesosternum is never protuberant, the femora are never toothed. 

 The tibia; vary in form ; they are sometimes rounded at the tip and not sulcate ; 

 sometimes dilated into aia angle ; and sometimes sulcate on the outer margin. 



The species found in this country may be divided into the following groups : 



I. Palpi dilated ; 



1. Sides of the thorax notthickened. 



*_Tibise rounded at the apex, elytra irregularly punctured, or 

 with sinuous striae. 

 Elytra with labyrinthine spots. A 



Elytra striped. B. 



** Tibiae with an external tooth near the apex ; elytra with 



regular striae of punctures. C. 



2. Sides of the thorax thickened. D. 



