36G [June, 



12. B. e x i 1 i s, oblongo-ovatus convexus, supra lurido-testaceus, nitidus, 

 capite thoraceque cupreo-teneis, confertim punctatis, hoc margine lato apicali 

 lateribusque pallidis, elytris paroe fusco guttatis, striis profundis, fortiter punc- 

 tatis, interstitiis convexis uniseriatim puuctulatis, ad apicem rotundatis ; subtus 

 niger, pedibus testaceis. Long. *08. 



Le Conte, Ann. Lye. Nat. Hist. New York, 5, 211. 



Gila River, near the Pima Villages. Broader than the next species, and by 

 its small size very distinct from all the preceding. 



13. B. p a 1 1 e s c e n s, elongato-ovalis convexus, totus testaceus, capite tho- 

 raceque sat dense punctatis, occipite thoracisque medio obscurioribus, elytris 

 striis profundis punctatis, interstitiis planis irregulariter uniseriatim puuctulatis, 

 ad apicem rotundatis. Long. -06 -08. 



One specimen from either New York or Pennsylvania. 



B. Elytrorum humeri angulati. 



14. B. al t u s, nigro-aeoeus, nitidus elongato-ovalis,. convexissimus, compresso- 

 elevatus, capite sat dense punctato, thoriice lunato subtilius punctato, elytris 

 strii3 punctatis, internis antice obsoletis, postice profunde exaratis, interstitiis 

 disperse punctulatis. Long. -08. 



New Orleans; this interesting discovery we owe to Mr. Wapler. The strie of 

 the elytra are obliterated at the base, and the inner ones are more so than the 

 outer ones ; by this means the short basal stria seen between the first and second 

 in the species above described here becomes wanting. The thorax is broadly 

 rounded at base, and emarginate at tip ; these curves converge rapidly towards 

 the sides, which are thereby very much shortened, and the form becomes lunate 

 with rounded angles ; the punctures are small, but more distinct at the sides 

 than on the disr*. This species belongs to Volvulus (Brulle,) but the reasons 

 given by Erichson (Kafer Mark Brand. 204) fur uniting Volvulus with Berosus 

 are so just, that I have adopted his conclusions. 



B. maculo sus Mannerh. Bull. Mosc. 1853, from Russian America, is un- 

 known to me. It must be allied to B. punctatissimus, but differs in being only 

 finely and not densely punctured. 



Hydrophilus Geoffroy. 



In this genus I reunite all those specie3 in which the prosternum is small and 

 sulcate ; the metasternum produced into a long sharp posterior spine, and the 

 posterior tarsi compressed and ciliate. 



Our species are tolerably numerous, and may be naturally divided as follows : 



Palpi maxillares articulo ultimo breviore : (antennarum clava difformi.) 



a. Prosternum totum fissum Sp. 1. 



b. Prosternum margine antico integro Sp. 2. 



Palpi naaxillares articulo ultimo longiore vel praecedenti aequali ; (antennarum 



clava regulari) (Tbopisternus Sol.) 



c. Prosternum margine antico integro Sp. 3 9. 



d. Prosternum totum fissum Sp. 10. 



a. 



1. H. o v al is, olivaceo-niger nitidus, ovalis convexus utrinque attenuatus, 

 elytris punctorum seriebus solitis striisque pluribus externis versus apicem no- 

 tatis, ad apicem coniunctim rotundatis, abdomine pubescente, segmentis tribus 

 ultimis medio nitidis subelevatis, antennis palpisque rufo-piceis. Long. -30. 



Ziegler, Ej:oc. Acad. Nat. Sc. 2, 45. 



New York and Pennsylvania, rare. The claws of the anterior tarsi in the male 

 are long and not toothed, and the tarsi themselves are more flattened than in 

 the female; the latter has the claws armed with a large sharp tooth beneath. 

 The inner spur of the anterior tibiae of the male is short, flattened and truncate, 

 while that of the female is longer and acute. 



