On Aquatic Carnivorous Coleoptera or Di/tiscidce. 749 



APPENDIX 



DESCRIPTIONS NOT IDENTIFIED WITH SPECIES KNOWN TO THE AUTHOR. 



In this appendix I have collected together all such descriptions of species of 

 Dytiscidge as I have been unable to indentify certainly with any species known to 

 me. Some of these descriptions can never be surely recognised except by the aid 

 of authenticated specimens. A certain number are moreover probably identical 

 with species described by other authors under different names ; where such indentifi- 

 cation is probable but not certain I have not felt justified in assigning the names to 

 the list of synonyms, and the descriptions are consequently here reprinted. Most 

 of the descriptions are given in full, but in some cases only the diagnoses are 

 reproduced. Where I could make any guess of importance as to the position and 

 characters of a species I have ajipended a brief suggestion after the description. 

 For convenience of reference these descriptions are numbered consecutively, the 

 numbers being a continuation of those used in my own preceding species-descrip- 

 tions, in order to avoid repetition of numbers and consequent confusion : thus they 

 commence with No. 1172. 



1172. Acilius cinctatus, Aube, spec. p. 151. Mexico. 



" Ovalis vix ellipticus, convexiusculus, supra niger, infra nigi-o-piceus ; thorace nigro, ad latera luteo ; 

 elytris nigris, vitta longitudinali postice abbreviata ad marginem punctisque minimis ad apicem luteo- 

 notatis. Long. 9^, larg. 5^ mUl." 



[Followed hy a description.~\ 



" Je n'ai vu qu'un seal individu male de cette espece ; il appartient a ]\I. Gory, qui I'a re^u de M. Klug 

 comme venant du Mexique. " 



This is placed by Aube next to Acilius margineguttatus (No. 1070), to which it is apparently 

 similar. — D. S. 



1173. Acilius Isevisulcatus, Motcli., Bull. Mosc. 1845, I. p. 30. Crimea. 



" Acilius laevisulcatus m. de la Crimea a les sillons sur les elytres lisses comme I'Ac. semisulcatus, Dej. 

 de Sitka, mais il est plus grand. " 



I do not think this can be accepted as a description ; I anticipate moreover that it is probably only 

 Dytiscus sulcatus (No. 1052).— D. S. 



1174. Acilius laporti, Aube, spec. p. 139. Brazil. 



" Oblongo-ovalis, convexiusculus, supra nigro-cinereus, infra ferrugineo-testaceus ; thorace ad latera et 



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