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the apex; but it is stated under the description of scintillans, that 

 the color of the body is viridi-aeneous, the elytra ornamented with 

 flavate lines, and the length as 4.6 mm. ; also that the frontal sulci 

 are short and the sides of the prothorax sinuate basally, with the 

 angles right. None of these characters suits vinnulum at all well, 

 and I therefore have no doubt that the two species are distinct. 

 Definitum is evidently a related species, but differs in the small 

 elytral punctures, color, shorter antennae, form of the prothorax 

 and many other characters. The knowledge of these two species 

 from Arizona, demonstrates that there are a number of distinct 

 species of the vinnulum section as defined above. 



It is probable that the Alaskan incrematum Lee., given as a sub- 

 stitute for nigripes Mann., a preoccupied name, is distinct and in 

 no way a synonym of den tell urn, or its American representative 

 arcuatum Lee., as stated by Hayward. The coloration of the legs 

 must be quite different and the localities of the two forms are re- 

 motely separated. 



I fail to find anything resembling the true cor datum Lee., among 

 my material and the above description is derived from the original; 

 placabile is smaller, more slender, probably less flat above and has 

 a different scheme of elytral maculation, as can be observed from 

 the description; it also inhabits a climatically very different sec- 

 tion of the country. The elytral maculation of cordatum, judging 

 by the description, is evidently more of the patruele type, while that 

 of placabile agrees perfectly with the peculiar insulatum type of 

 maculation, this being quite different from that of patruele and its 

 numerous allied species, especially in the humeral region of the ely- 

 tra. 



T'ie species acticola and vividnm were erroneously reduced to 

 synonymy by Horn and Hayward ; the former is decidedly a smaller 

 species than either contractum or constrictum, with smaller head 

 and prothorax than either and also having a more slender form 

 than constrictum and notably shorter elytra than contractum, while 

 vividum is wholly out of place when associated with any one of the 

 three mentioned, being a member as it is of a peculiar subsection 

 represented above by the Floridian prosper -urn and luculentum, 

 which are characterized by the very much narrower base of the 

 prothorax, greatly abbreviated elytral striae and deep black polished 



