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



Pselaphacus rnbricatus. 



Erotijlus ruhricatus, Ubst. Kdf. 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 sublosvibus, striato-punctatis, annulo liumerali 

 sanguineo intus caudato et i:)er marginem ad fasciam sanguineam 

 subarcuatam pone medium continuato. L. G lin. 



Amazons (Bates). 



Pselaphacus Nicaraguse.* 



Psekqjhacus Nicaraguce, Crotch, Cist. Ent. 142. 

 Nicaragua (Janson). 



Megischyrus. 



Crotch, Cist. Ent. 143 {typ. undatus, 01.). 



Megischyrus undatus. 



Erotijlus umlatus, Oliv. Enc. Meth. vi. 434 (1791). 



oblongus, Dup. Erot. 40. 



Ischyrus , Lac. Erot. 92. 



Cayenne. 



Megischyrus brasiliensis. 



Ischyrus brasiliensis, Lac. Erot. 91. 



Brazil. 



Closely allied to M. undatus, from which it differs by the 

 moi'o evidently punctate strire of the elytra; I am, however, in- 

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

 similar manner. 



Megischyrus Jurinei. 



Ischyrus Jwrinei, Lac. Erot. 94. 



fasciato-deutatus, Gucr. MSS. 



Bolivia. 



Allied to 21. brasiliensis in structure. I have not seen a 

 specimen with the margins of the elytra red as desci'ibed by Lacor- 

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

 by Bates; his series of specimens are nearly intermediate between 

 M. undatus and M. Jurinei. 



