326 PROCEEDINGS OF THE ACADEMY OF 



smaller species with more convex prothorax more narrowed at the 

 base ; it seems to be B. pictum Lee. 



63. N. iNTERMEDius Kirb}'^ of the same size as versicolor, but 

 with the sides of the prothorax distinctly sinuate near the base; 

 seems to be B. rapidum Lee. 



64. N. NiGRiPES Kirby, ver}- similar to intermedius, but nearly 

 black, with small pale spots and dark legs. 



05. Tachyla picipes Kirby is T. inornatus (Say) = T. nanus 

 of Europe, as correctly determined by Schaum, Ins. Deutschl. i. 



60. Haliplus pantherinus Aube. The type in the British Mu- 

 seum is a small species resembling immaculicollis in size and 

 color. 



67. CoLPius INFLATUS Ijqc = Supliis Douhledayi B. M. Cat. 



68. SuPHis F0RSTER14. ^- ^^- C'at., size of gibbulus, but the 

 elytra are very strongly punctured. 



69. Hydrocanthus Harrisii^ B. M. Cat., size of gibbulus, 

 but narrower, with the elytra black, finely and obsoletely punc- 

 tured. 



TO. Colymbetes pii^eopterus Kirb}-. % with the last joint of 

 front tarsi not deformed ; 9 sides of prothorax finely margined, 

 very slightly rounded, scarcely forming an angle with the elytra, 

 \Q\:y finely reticulate, somewhat dull ; elytra very finely granulato- 

 reticulate, and sparsel}- punctulate. 



Tl. C. BicoLOR Kirby. More regularly elliptical and convex 

 than the preceding, also finely granulato-reticulate, but scarcely 

 punctulate, prothorax similar in form, but not more reticulate in 

 9 than % ; elytra pale towards the sides. Both species are allied 



to AgABUS DISCOLOR. 



T2. C. RETiGULATUS Kirb}' is allied to Aqabus arcticus of 

 Europe. 



73. Colymbetes sinuatus Lee. should be compared with the 

 European C. Graph, Avhich it closely resembles. 



74. Acilius Maccullochii Kirby is mediatus Say. 



75. Hydroporus exiguus Aubd. Xothing like this is in our 

 collections. 



70. Nkcrophorus melsiiei.meri Kirb}', evidentlj- the form 

 named infodiens Mann. The protliorax is as in marifimus of 

 which it is a variet}^; antenna with the base of the club black, 

 remaining joints red ; elytra witli two bands and epipleuroe red. 



77. N. Ilallii Kirby is orbicollis Say. 



