THE CANADIAN ENTOMOLOGIST. 43 



prothorax, subparallel, rather coarsely but vaguely punctate, costse variable 

 in distinctness. 



Length 6.1-6.6 mm.; width 2-2.4 ^n™- 



Rincon Mts., Southern Arizona (Beyer). 



AT, octarthrtis^ n. sp. 



Nearly similar to the preceding, the elytra and median parts of the 

 prothorax fuscotestaceous. Antennce 8-jointed. Prothorax but slightly 

 wider than long, sides feebly obliquely convergent behind. Elytra a little 

 shorter with sides more evidently arcuate in some specimens, the punctu- 

 ation dense, rather coarse and better defined than in the preceding. 



Length 4.75-5.3 nim.; width 2 mm. 



Rincon Mts,, Arizona (Byer). 



Var. pecosensis^ n. var. 



Under this name I include as a variety or race of the above a series 

 of four examples from Pecos, New Mexico, taken by Prof. Cockerel!. 

 They differ from the typical form by their larger size (5.5-6.6 mm.), rela- 

 tively longer elytra, somewhat larger eyes and slightly less stout antennae. 

 One specimen is anomalous in its shorter elytra and is probably aberrant ; 

 it has, however, deterred me from describing this as a distinct species. 

 This species or subspecies was recorded as angustatus in the New Mexico 

 List, following LeConte's determination of Colorado specimens, which are 

 probably the same thing. 



M. decarthrus, n. sp. 



Elongate, parallel, prothorax distinctly, elytra moderately shining, 

 colour as in the preceding species. Antennse lo-jointed. Prothorax 

 slightly wider than long, sides a little more convergent behind, apex nar- 

 rowly subtruncate at middle, surface shining, the punctures of different 

 sizes, but as a whole finer, shallower and distinctly separated; median line 

 channeled posteriorly. Elytra narrow, parallel, more than three times as 

 long as the prothorax, punctuation close but vague and rather fine ; costse 

 evident. 



Length 6.6 mm.; width 2.2 mm. 



Chiricahua Mts., Southern Arizona. A single specimen collected and 

 given me by Mr. V. L. Clémence, of Pasadena, California. 



The five species of Microphotus known to me may be easily separated 

 by the following table, the characters of course pertaining to the males 

 only : — 



