^-'- 



- Y 



172 



Say^s Descriptions of new 



-ft" 



with small; equal, equidistant, numerous punctures ; polish- . 

 ed : pal])i and hase of the aiiiennce pale yellow ; three last 

 joints of the latter fuscous : thorax piceous on the lateral 

 and posterior margins : scutel small, with but few punc- 

 tures : elytra destitute of strise and without any appear- 

 ance of one on the sutural margin ; punctures on the ba- 

 sal margin obsolete : heneath piceous : tarsi yellow, 



brighter beneath. 



Length less than three twentieths of an inch. 



**.*^ jpecies was sent to me by Mr. Barabino. It is 

 smaller than the orbicularis ^F., which it resembles much 

 in the puncturing and form ; but that species has the sub- 

 sutural striae extending from before the middle to the tip 



of the elytra. 



3. H.fuscus, Nob. Corresponding, almost unvariedly, 



with specimens found in Pennsylvania. 1 obtained it in 

 company with Hydrocanthus atripennis^ Nob. 



Sphjeridium, Fab. 



4 - 



S. mellijpes. Black ; beneath honey-yellow. 



Inhabits Mexico. 



Body very minutely, and densely punctured, black': 

 antenncd and palpi honey-yellow : thorax with the ante- 

 rior and lateral margin obsoletely piceous ; an impressed 

 puncture on the lateral margin before the posterior angle : 

 elytra with punctured stri^, and minute, dense punctures 

 on the flat interstitial spaces ; immaculate : beneath honey- 

 yellow. 



Length less than one fifth of an inch. 



The largest North American species which I have seen ; 



r 



rather larger than S. bi-pustuldtum, Fabr. but somewhat 

 less robust. 



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