344 COLEOPTERA OF NORTU AMERICA. 



chiefly by the prothorax margined at base. Metaparia has the 

 last five joints or antennae more enlarged than any other genus 

 in our fauna. The group Colaspis (Colaspides) is defined by 

 Chapuis as having the sides of the prothora.x undulated. This 

 is the case in our species with coarse sculpture, but is not so in 

 C. picipes and trisiis, which we suspect will properly find their 

 place in genera in other groups. As, however, both the groups 

 and genera seem to have been unnecessarily multiplied in this 

 family; we will leave this subject for future investigation. The 

 genus described by Mr. Crotch, as Typophorus, corresponds with 

 Tymnea Chapuis, of the above table, and Heteraspis| Lee. with 

 Graphops. 



Tribe VIIL— CHRYSOjHELIjVI. 



The species of this tribe are of moderate, rarely small size, oval 

 and convex in form, and usually of metallic or variegated colors, 

 differing in arrangement according to the genera. The autennaj 

 are always widely separated, never very long, and are moderately 

 thickened towards the end. The eyes are moderate, not promi- 

 nent, feebly emarginate. The palpi are frequently dilated at tip 

 and truncate. The side margin of the prothorax is always well 

 defined; the front coxjb are transverse and widely separated, the 

 coxal cavities are closed (Timarcha and Entomoscelides), or open 

 in the other genera. The elytra have distinct epipleuroe, and 

 cover entirely the pygidium.' The abdomen is composed of five 

 ventral segments, separated by straight sutures, and. are nearly 

 equal. The tibial spurs are always inconspicuous, and except 

 in rare instances (Gastroidea, Phyllodecta) the 3d tarsal joint is 

 not lobed, and at most slightly sinuate at the distal margin ; the 

 claws are variable in form. 



The groups represented in our fauna arc as follows ; and the 

 sequence of genera is somewhat different from that represented 

 by Mr. Crotch in the memoir already cited. 



Anterior coxal cavities closed. 2. 



Anterior coxal cavities open. 3. 



2. Metasternum short. I. Timakcii.e. 

 Metasternum long. II. Entomoscehdes. 



3. Claws toothed or l)ifid. 4. 

 Claws simple. HI. Chkysomel.^?. 



4. Tibic-B dilated and toothed near the tip. IV. Goniocten^. 

 Tibise not dilated and not toothed. V. PHYLLODECT.a:. 



