NORTH AMKIUCAN COLEOPTERA. 43 



wider than long, sides arcuate and slightly narrowing behind, the hind ungles 

 rounded, disc feebly convex, at sides narrowly depressed, more l)roadly near the 

 bind angles, basal depressions vague, smooth, the median line finely impressed ; 

 elytra oval, one-third longer than wide, finely but sparsely striate, strisE not 

 punctured, intervals flat, smootli. dorsal i>unctures three, the anterior on the 

 third stria, the other two on the second ; body beneath rufo-piceous, smooth. 

 Letigth .24— .26 inch.; fi-6.5 mm. 



This species belongs near propbtquus, and in fact considerably re- 

 sembles that species, but the form is rather broader, the hind angles 

 rounded and the elytral strife absolutely without trace of punctures: 

 The side margin of the thorax is not at all reflexed. 



Occurs in southern Arizona (Morrison). 



On page 375 of the " Catalogus" P. phiin'penn is Motsch. Kaef. 

 Russl. p. 68, appears as a synonym oi' pammpniidatus, which in turn 

 should be superseded by Muelleri Hbst. 



The description by Motschulsky is very brief, as follows: 



Agonoihorax pJanipennis, Gleicht dem A. famelicus, ist aber etwas 

 kleiner und platter. Die Deckschilde sind minder stark gestreift 

 und mit mehr metallischen Glanze. 



"Yhe famelicus mentioned is a synonym oi' fossiger Dej., and the 

 Motschidsky description will very accurately fit some of the varieties 

 of that species. 



Having, through the kindness of Dr. Hamilton, obtained some 

 specimens o^ Muelleri, of Swedish origin, their resemblance to errans 

 was found to be very great, and their appearance very unlike /oss/ye?-. 



As compared with errans, Muelleri has the fovea of the hind an- 

 gles of the thorax less deep and smooth, while in errans it is punc- 

 tate. The antennae of errans are brownish, the basal joint pale, 

 while in Muelleri the antennse are entirely piceous. As a rule the 

 legs of errans are pale, in Muelleri more or less piceous, but this is 

 subject to variation in hoih forms. It is, consequently, hardly neces- 

 sary to say that Muelleri cannot be accepted in our lists merely on 

 the authority of the " Catalogus." 



At this time it is well to call the attention of those using the 

 "Synopsis of N. A. Platyni" by Dr. LeConte (Bull. Biookl. Ent. 

 Soc. ii, pp. 45-58) to a slip of the ])en rather difficult to detect, ex- 

 cept by one having a large series of species. On page 48, near the 

 (uiddle of the page at the inner edge, the numbers 9, 12, 13, follow 

 each other from above downwards. Numbers 12 and- 13 should be 

 13 and 14, and, as a result, in following out the tabulation, the spe- 

 cies will be correctly identified. 



TRANS. AM. ENT. SOC. XIX. M.\RCH. 1892. 



