284 MEMOIRS ON THE COLEOPTERA 



with the three teeth sharp and well developed. Length (9) 14.8 

 mm.; width 8.85 mm. Mexico (Cuernavaca, Morelos), Wickham. 



*aequalis n. sp. 



In the chevrolati section sexual characters are pronounced and 

 manifest in several directions as stated, but in the cinerea section, 

 which differs greatly in the flatter mesosternal process and finer 

 lateral thoracic beading, as well as in the general style of coloration, 

 sexual characters become almost obsolete and reside, so far as I 

 can see, simply in the anterior tibiae, the upper tooth being smaller 

 and feebler in the male and sometimes altogether obsolete in that 

 sex; the under surface and legs are polished black throughout in 

 both sexes; the minute callus at the middle of the apical thoracic 

 margin, generally evident in the cinerea section but noticeable 

 nowhere else, is also distinct in Cotinis and in Argyripa becomes 

 larger, anteriorly prominent and conspicuous; perhaps it is the 

 vestige of a longer thoracic process in some extinct precursors. 

 Mr. Bates gives several southern Mexican and Central American 

 localities for sallei, but in my opinion he has confounded a number 

 of related species. The above description of argenteola Bates is 

 derived directly from the original, as it is said by Mr. Schaeffer to 

 have been taken in Cochise Co., Arizona. The under surface in 

 Icetula could hardly be termed cobaltic, which in the usual sense 

 means a rather pure blue; in Icetula this color is pale bluish-green 

 and the metallic lustre is not silvery so much as coppery; the 

 dorsal punctures are far less developed and the size materially 

 smaller. In the figure of argenteola on plate 22 of the Biologia, the 

 tarsi have a pallid tint, perhaps a mere inaccuracy on the part of 

 the artist, but if true the tarsi are very different from those of 

 Icetula, where they are black. Margaritis Bates, of which I have 

 two fine examples from Guerrero, taken by Baron, is allied rather 

 closely to argenteola, showing that there are probably numerous 

 other allies of that species besides margaritis and Icetula. 



Group II. 

 Subgenus Gymnetina nov. 



The polished upper surface and the cephalic ridge, as well as 

 certain peculiarities of the vestiture, would seem to indicate a 

 rather distinct subgeneric group of Gymnetis, for which the above 



