290 [ April, 



April 2\ih. 



Vice President Bridges in the Chair. 



The Committees to which were referred papers read bj Dr. Le Conte 

 April 3d ; by Dr. T. C. Henry U. S. A. read same date; by Dr. Genth, 

 read April 10th; by Mr. 0. Girard, read April 17th; by Mr. Cassin, 

 read same date; by Mr. Blake, read April 24th; and by Prof. Baird, 

 read same date, reported in favor of publication in the Proceedings. 



Analytical table of the sp>ecies of Hy drop or us found in the United Stales, with descrip- 

 tions of new species. 



By John L. LeConte, M.D. 



[The reference Lee. 1 denotes that the species are described in the Annals of the 

 Lyceum of Natural History of New York, Vol. 5 ; they are all Californian. 

 Those not so marked were described by me in Agassiz' Lake Superior.] 



Hydroporus Clairville. 



A. Breviter ovati convexi, glabri; thorax haud impressus. 



a. -1, Epistoma rotundatum haud marginatum 1. farctus. 



b. Epistoma rotundatum subtiliter marginatum; 



.12, subopacus valde punctatus 2. hydropicus Lee. 1 



.12, nitidus piceus valde puoctatus 3. punctatus fiub'e. 



.11, parcius punctatus, thoracerufo (elytris saepe maculatis) 4. cuspidatus Germ. 



B. Breviter ovati, minus convexi, glabri : thorax linea basali nulla; epistoma 

 rotundatum subtiliter marginatum ; 



09, Thorax basi utrinque foveatus ; elytra costula la^erali 



brevissima; macula com muni alteraque utrinque nigris 5. latissimus Lee. 1 



08, Thorax basi haud foveatus ; elytra costula laterali Ion- 



giore ; macula communi alterisque utrinque tribus nigris 6. acaroides. 

 Convexior piceus immaculatus, elytris thoraceque simplicibus ; 



07, subtiliter punctatus 7. convexus Aube. 



05, subtiliter punctulatus 8. granum. 



C. Breviter ovatus minus convexus glaber ; thorax plica brevi basali utrinque 

 ornatus, cum elytrorum costa discoidali connexa : 



06, testaceu3, elytris fuscis testaceo-nebulosis (mihiignotus) 8 1 . exiguus Aube. 



D. Oblongi ; thorax striola utrinque basali ; epistoma haud marginatum. 

 1. Striola in elytris continuata. 



* Elongati, glabri. 



c. Elytra nebulosa, minus subtiliter punctata ; 



065, fuscus testaceo vix nebulosus, sequente paulo angustior 9. obscurellus Lee. 1 

 06, testaceus pectore thoracis medio, elytrorumque lineolis 



fuscis 10. affinis Say. 



06, testaceu3, thoracis medio, elytrorumque lineolis paucis 



fuscis 11. macularis Lee. 1 



06, testaceus thorace basi nigro, elytris vittatis 12. pullus. 



d. Elytra nebulosa, subtiliter punctulata ; 



055, elytris striola basali longiuscula 13. lacustris Say. 



e. Elytra maculis vei fasciis transversis ornata ; 



065, minus subtiliter punctatus, (femina opaca) 14. cinctellus Lee. 1 



05, subtiliter punctatus, stria snturali nulla 15. amandus Lee. 1 



05, subtiliter punctatus, stria suturali di^tincta 16. subtilis Lea 



** Elongati, subtiliter pubescentes ; elytra nebulosa : 

 06, testaceus, elytris postpectoreque fusco-piceis 17. inconspicuus. 



