NORTH AMERICAN COLEOPTEKA. 227 



with a transverse depression. Posterior tibia sliglitly sinuate on the 

 inner edge. The last ventral of the female is bi-eniarginate, forming 

 thus three acute teeth. 



This insect and Tymnes metasternalis have such a close resemblance 

 superficially that 1 liave found the latter among specimens sent as 

 the former. 



Regarding the name adopted for this species some explanation is 

 probably necessary, inasmuch as two valued correspondents have 

 rather protested against the name adopted. 



The S{)e'cies was described by Olivier from the collection of Bosc 

 at the same time that he redescribed viridis Fab. Of the latter 

 species he notes varieties with pale and piceous legs, but for some 

 reason he has failed to describe tricolor Fab. T make this note be- 

 cause it has been supposed that Olivier had tricolor before him when 

 he described picipes. The name picipes is certainly misleading, as 

 the figure shows the insect to have pale legs. 



The principal reason, however, for adopting picipes over pnetexta 

 is that the Bosc collection is in great part in the Jardin des Plantes 

 in Paris, where Lefevre probably saw the type, and he places picipes 

 in Ilhabdopterus, and as we have no representative of the genus in 

 our fauna other than prcetexta, the conclusion must be that picipes 

 and prcetexta are the same. 



Occurs from Massachusetts westward to Dacota and south to N. 

 Carolina. Say states that it is common on the myrtle, while Blan- 

 chard finds it abundant on basswood ( Tilia). 



WETAXYOXYCilA Marshall. 



To this genus Colaspis arizoiue Cr. should be referred. Metaxyo- 

 nycha is referred by Chapuis and Lefevre to the group Colaspitje, 

 and differs from all the members of that by the middle tibire being 

 deeply emarginate on the outer edge near the apex. The posterior 

 tibiae have a very feeble emargination. The other characters are 

 essentially those of Colaspis. 



Two forms are known to me. 



Color above entirely orange-yellow arizoiia^. 



Elytra blue, with the entire margin, suture and a tran.sverse band crossing the 

 suture orange-yellow circniiKaiieta. 



M. arizonte Crotch, Proc. Acad. 1873, p. 45. — Orange-yellow, anteniiie (ex- 

 cept four basal joints) and tarsi black. Head coarsely and deeply punctate, 

 clypeus smooth. Tiiorax more than twice as wide as long, narrowed in front, 



TR.\N.S. AM. ENT. SOC. XIX. AUGUST. 1892. 



