AMERICAN COLEOPTERA. 281 



The anterior tarsi have a total of fifteen palettes and the claws are un- 

 equal, the posterior being one-third shorter, feebly arcuate, but distinctly 

 sinuate beneath. The claws of the middle tarsi $ are feebly arcuate 

 and of unequal length. 



O. OCCiden talis n. sp. — Form more elongate than in cinereus, colors pre- 

 cisely similar. Male sexual characters as above. Length .54 inch ; 13.5 millim. 



This species seems closely allied to austriacus, but Dr. Sharp says its 

 anterior claws are a " little unequal." Here they are very unequal on 

 the anterior and middle feet. 



Occurs in California and Washington Territory. Female unknown. 



The following species are those unknown to Dr. Sharp and placed in 

 an appendix to his paper. As some of them have escaped notice in our 

 lists, it has been thought advisable to make such notes concerning them 

 as may aid in their determination. The numbers given are those of Dr. 

 Sharp's Appendix. 



1180. Agabus atrotus Mann., probably tristis Aube. 



1193. Agabus irregularis Mann. Has been identified by Crotch 

 with hypomelas Mann., and, probably, correctly. 



1201. Agabus scapular is Mann., probably anthracinus Mann. 



1202. Agabus subopaeus Mann., can not be identified. 

 1227. Colymbetes fossiger Motsch., is Agabus morosus Lee. 

 1249. Colymbetes sobrinus Motsch., is Agabus nigroaeneus Er. 

 1251. Colymbetes strigosus Lee, is a clerical error (=strigatus). 

 1285. Dytiseus anxius Mann., is probably circumcinctus Ahr. 

 1292. Dytiseus fuseostriatus Motsch., probably circumcinctus Ahr. 

 1413. Hydroporus pcrsimilis Cr. The type of this species in my 



cabinet does not seem different from collaris Lee. 



1423. Hydroporus puleher || Motsch., is a pale striatellus Lee. 



In addition to the above there is nearly an equal number of species 

 due to Say, Melsheimer, Mannerheim and Motschulsky, which have 

 escaped recognition and seem to be beyond the limits of an approxima- 

 tive guess. 



The following species described by Kirby in the Fauna Boreali Ameri- 

 cana have, for the most part, been omitted by Dr. Sharp. The types are 

 all in the British Museum and their synonomy could have been authori- 

 tatively decided by him. I have seen nearly all of them and the follow- 

 ing notes will, probably, be found correct : 



Hydroporus nigrolineatus Step., is probably not that species, but one 

 of the smoother forms of Coelambus impresso-punctatus ScTiatt, other- 

 wise known to us as Hydroporus quadrilineatus Mann. 



TRANS. AMER. ENT. SOC. X. (71) JULY, 1883. 



