THE CANADIAN ENTOMOLbGIST. 35 



20. Form narrowly elongate-oval, rather strongly convex, the prothorax 

 elongate, broadly rounded and narrowed toward tip, the sides 

 slightly sinuate posteriorly just before the small and sharply everted 

 basal angles ; elytra rather strongly narrowed and broadly, feebly 

 arcuate from base to apex, the latter relatively narrow and arcuato- 

 truncate; strioe feebly impressed, finely punctate, the intervals nearly 

 equal and but slightly convex, strongly so at the sides, minutely, 

 not densely punctulate. Length {^) 28.5 mm.; width 7.6 mm. 

 Arizona (Benson), Dunn Behrensi, Cand. 



The form of the pale margin of the prothorax seems to be com- 

 paratively constant and therefore useful in classifying the species as 

 above. The species figured in the " Biologia " as Webbi, by Mr. 

 Champion, and subsequently referred to Apacheamcs, is distinct from both; 

 it has the marginal pronotal vittje broader than in Apacheanns and allies, 

 and slightly dilated inwardly near the middle, a character never observable 

 in those forms. It may be named Sonoriciis (n. sp.). In like manner the 

 species published on Plate 12 of Vol. Ill, part r, fig. 3, of the "Biologia," 

 appears to be more than a variety o^ virginaiis, and it may take the name 

 Chainpiojii (n. sp.). The form given in fig. 8 of the same plate, as a 

 variety of Desmaresii, may take the name hrevicollis (n. sp.); it is narrower 

 and more parallel than Des?naresti, with a much shorter prothorax, having a 

 broader median dark vitta and with much finer elytral ridges between the 

 stride. Aziecus and iodalis, of the above tnble, are related to approxi- 

 matits, Er. , differing in their much narrower form, less anteriorly 

 converging sides of the prothorax and less dilated elytra, among other 

 characters, and amictus is related to pisto?-ius, being very much more 

 narrowly oval. The form identified above as Behrensi, Cand., may not be 

 wholly identical, but it reasonably satisfies most of the characters of the 

 very short description of that species. The species of Chalcolepidius are 

 very local in distribution in the Sonoran regions, as in the case of many 

 other genera. 



ZOPHERINI. 



The genera of this tribe are well defined in available works, and it is 

 therefore unnecessary to repeat the table given by Leconte and Horn in the 

 " Classification ''; it should be mentioned, however, that the genus 

 Zopherus, as at present organized, is composed of four genera, three of 

 them at least very sharply delimited and distinct in structure and facies. 

 These genera may be defined as follows : 



