422 (46) Mr. G. R. Crotch's Revision of 



Pselaphacus rubricatus. 



Erotylus ruhrkatus, Hhst. Kaf. viii. T. cxxxvii. f. 2. 



Pselaphacus , Lac. Erot. 85. 



Cayenne, Amazons, Ecuador. 



Pselaphacus approximatus, sp. n. 



Niger, nitidus, capite punctulato; tliorace obsolete punctulato, 

 brevi; elytris sublsevibus, striato-punctatis, aumilo humerali 

 sanguineo intus caudato et per marginem ad fasciam sangumeam 

 subarcuatam pone medium coiitinuato. L. G lin. 



Amazons (Bates). 



Pselaphacus Nicaraguss.* 



Pselaphacus Nicaraguce, Crotch, Cist. Ent. 142. 

 Nicaragua (Janson). 



Megischyrus. 



Crotch, Cist. Ent. U3 {typ. imdatus, 01.). 



Megischyrus undatus. 



' Erotylus undatus, Oliv. Enc. Meth. vi. 434 (1791). 



ohlongus, Dup. Erot. 40. 



Ischyrus , Lac. Erot. 92. 



Cayenne. 



Megischyrus brasiliensis. 



Ischyrus brasiliensis, Lac. Erot. 91. 



Brazil. 



Closely allied to M. umlatus, from wliicli it differs by the 

 more evidently punctate strise of the elytra; I am, however, in- 

 clined to consider it a variety, especially as M. Jurinei varies in a 

 similar manner. 



Megischyrus Jurinei. 



Ischyrus Jurinei, Lac. Erot. 94. 



fasciato-dentatus, Guer. MSS. 



Bolivia. 



Allied to M. hrasilieiisis in structure. I have not seen a 

 specimen with the margins of the elytra red as described by Lacor- 

 daire, but I have one of M. undatus without the red margin taken 

 by Bates; his series of specimens are nesu'ly intermediate between 

 M. undatus and M. Jurinei. 



