ii4 MEMOIRS ON THE COLEOPTERA 



with excessively minute sparse punctulation, barely discoverable; scutel- 

 lum transversely oval; elytra two-thirds longer than wide, as wide as the 

 prothorax and two and not quite one-half times as long, the subsutural 

 groove continuing about the apex and along the sides, the sulcus near 

 outer third extending to apical seventh, the finer stria on the upper part 

 of the flanks ending at the middle and not quite attaining the humeri. 

 Length 14.0 mm.; width 4.4 mm. Mexico (Guerrero), Baron. 



The coloration seems to be different from that of fasciata Gray, 

 and the elytra are much more abbreviated. The sex of the single 

 individual at hand is not discoverable at present. A specimen from 

 Brazil, sent to me by Mr. Grouvelle under the name fasciata, is 

 much more elongate than mexicana, the superciliary groove is 

 much less broad and deep and is polished at the bottom and the 

 elytra are uniformly castaneous. Guerrero is on the western slope 

 of the Mexican plateau, a region zoologically rather different from 

 the Atlantic coast regions quoted as the locality of fasciata. 



Catogenus Westw. 



As at present organized, this genus contains rather numerous 

 species from Africa and North America, but, as the American species 

 hold together very closely in facies, it would be interesting to know 

 whether or not the African species are really congeneric, since generic 

 differences in this part of the series are likely to be correspondingly 

 slight to superficial view. I find on closer examination, that there 

 is no such remarkable variation in size of our Catogenus rufus as 

 hitherto believed, but that there are several distinct species involved, 

 as I have suspected for many years. There is also an interesting 

 new species at hand from southern Florida. At first it seemed 

 almost impossible to discriminate the sexes, but, although the dif- 

 ferences are slight, it will be found easy to do this, for the male, 

 as seen in series, is larger and stouter than the female and has the 

 antennae notably longer and slightly thicker. The forms in my 

 collection, which may be regarded as species provisionally, are as 

 follows : 



Canaliculation along the median line of the head evident throughout the 

 length 2 



Canaliculation obsolete anteriorly; body very small in size and with 

 shorter elytra, the eyes relatively smaller; second joint of the antennae 

 globular, as long as wide 4 



2 Antennae short, very thick, moniliform, the joints subglobular and 



