222 GEORGE H. HORN, M. D. 



T. oregoiiensis Cr. is removed from the genus and placed in close 

 proximity to Colaspis. 



T. tricolor Fab., Ent. Syst. i, p. 316. 



viridis Fab., Syst. El. i, p. 413; Oliv., Ent. vi, p. 886, pi. ii, fig. 17. 

 verticalis Chap., Geu. Col. x, p. 311, note. 



Very variable in color as indicated in the table. The more de- 

 cidedly green specimens are generally males. By far the larger 

 number of specimens have pale legs, but forms with piceous legs are 

 occasionally seen. Labrum always yellow. Specimens are often 

 seen with the elytra subcostate, especially near the apex. Anal seg- 

 ment often pale, more especially in the males, in which sex that seg- 

 ment is broadly emarginate and with a transverse depression. 



Occurs in the Atlantic region from Massachusetts southward. 



T. violacetlS n. sp. — Similar in form to tricolor, but always smaller: color 

 deep blue, shining, the surface with violaceous reflections, thorax more or less 

 green. Antennse testaceous, the outer four or five joints darker. Labrum pale. 

 Head sparsely punctate. Thorax not coarsely, but moderately closely punctate. 

 Elytra more coarsely punctate than the thorax, punctures irregularly placed, 

 closer near the base, nearly obliterated at apex. Body beneath piceous, shining; 

 abdomen coarsely not closely punctate. Femora piceous, tibiae and tarsi usually 

 paler. Length .20 inch. ; 5 mm. 



The male has the last ventral segment truncate and with a mod- 

 erately deep transverse fovea. 



Formerly this species was supposed by me to be Colaspis chrysis 

 01., and is doubtless so named in several collections, but recent 

 studies of the species described by Fabricius and Olivier have caused 

 me to apply that name to another insect. 



Collected near Allegheny, Pa., by Dr. John Hamilton. 



T. inetasteriialis Crotch, Proc. Acad. 1873, p. 38. 



Closely resembles tricolor, but differs in having the head and thorax 

 more densely punctured, the latter somewhat aciculately. The un- 

 derside of the body is also more densely punctate, particularlv at 

 the sides of the metasternum. 



Occurs in Illinois and western Pennsylvania (Dr. Hamilton). 



COI.ASPIS Fab. 

 Notwithstanding the rather wide separation of this genus and 

 Tijmnes in the books, they are certainly rather difficult to differentiate 

 sharply. They belong, however, to two distinct series, Colaspis hav- 

 ing no post-ocular lobes, nor is the lower ]X)rtion of the prothoracic 



