72 MEMOIRS ON THE COLEOPTERA. 



less prominent than in cava, and thence to the base about straight from 

 a dorsal viewpoint, the basal lobe broader and more indefinite, not 

 separated from the angles by deep and symmetrical sinuses, as it is in 

 that form, the indistinct punctulation and the pubescence both closer 

 and more evident than usual; elytra and abdomen nearly as in lobata. 

 Length 5.3 mm.; width 2.25 mm. Pennsylvania (Westmoreland Co.), 

 Schmitt. 



Evidently different from either cava or lobata by reason of the 

 subparallel head and the broader and less abruptly formed basal 

 lobe of the prothorax, but whether these forms are species, or have 

 less value, can only be determined by more ample material and 

 more detailed study of the genus than is possible at present. 



Montana Csy., differs from specimens before me of both sexes 

 from Manitoba, identified as hirsuta Wassm., in the decidedly 

 less slender antennae, with a shorter and stouter basal joint and 

 in the larger eyes, which are somewhat less than their own length 

 from the base. Two examples from Colorado, male and female, 

 are closely allied to the Manitoba species, but differ in having the 

 antennal joints more strongly narrowed basally, or more abruptly 

 inflated apically, and in the somewhat less strongly reflexed sides 

 of the pronotum basally; the prothorax in this Colorado form is 

 much wider in the male than in the female. 



Xenodusa caseyi Wassm., from Colorado, and angusta Fall 

 (Lomechusa), from southern California, differ from any of those 

 mentioned above in their much narrower form of body, and the 

 former, at least, by having a relatively much longer and more 

 slender basal antennal joint and anteriorly uninflated prothorax, 

 similar in fact to that of the European Atemeles emarginatus. 



Myrmedonia Erichs. 



In this and allied genera the new world is more deficient than 

 the old, not only in number but in the size of the species, some of 

 the Hindustan species being very large, equaling in this respect 

 our Maseochara, of the preceding tribe. The following species is 

 allied to loricata Csy. : 



Myrmedonia carolinae n. sp. Rather stout, riot parallel, convex, 

 shining, dark piceo-testaceous, the elytra somewhat blackish externally, 

 the abdomen black, the first two segments paler, especially at their 

 apices; pubescence short, rather sparse and inconspicuous; head nearly as 

 long as wide, fully four-fifths as wide as the prothorax, the eyes moderate, 



