UNITED STATES AND MEXICAN BOUNDARY. 



11 



9. Large collections made by myself, in 1850-51, between San Diego, California, 

 and Fort Yuma on the Colorado River. An excursion from the latter point to Tucson 

 furnished but small results, as the season was unfavorable, and subsequent loss of 

 transportation required my attention to be directed from science, to objects of more 

 vital importance. 



Notwithstanding the copious materials here brought together, the region reported 

 on must furnish still important results to future collectors. Every collection that has 

 yet been made, has furnished a very large proportion of new species, and with few 

 exceptions the same species have not occurred at different places or times. The 

 minute ones, except in the region visited by myself, have received but little attention : 

 an immense number yet remain. 



Exception has been made in the Catalogue of six or seven Curculionidas of which 

 the genera could not be determined, and of many Staphylinidse, which should not be 

 described, until a monograph of all the species found in the United States be prepared. 

 Several species of Heterocerus are also allowed for the present to remain unnamed. 

 Various species which have recently been procured, or which have remained undis- 

 cribed are added in order to bring the catalogue fully up to the present time. 



TABLE OF THE DISTRIBUTION OF GENERA ACROSS THE CONTINENT. 

 Columns T. II. and III. as in the table of species. 



a. Apristus, Stenomorphus, Haliplus, Cnemidotus, Hydrochares, Cyclonotum, 

 Catops, Faronus, Othius, Leptacinus, Elater, Cardiophorus, Enoplium, Anobium, 

 Ptilinus, Exops, Nosoderma, Helops, Platydema, Phaleria, Eurygenius, Hylesinus, 

 Chrysochus, Microrhopala, Chilocborus. 



b. Eunectes, Triorophus, Eurymetopon, Centrioptera, Coniontis, Eusattus, Noti- 

 bius, Conibius, Microsobatia, Pelecypborus, Eleodes, Tanarthrus, Crossidius. 



c. Including the following not found north of Texas : Dromocborus, Gynandro- 

 tarsus, Lutrochus, Eugastra, Lasiopus, Scaptolenus, Astrotus, Mannopborus, Sphe- 

 nothecus. 



d. Melanotus, Erotylus, Plusiotis, Orsonyx, Oncerus, Gyascutus, Thrincopyge, 

 Schizopus, Edrotes, Craniotus, Cerenopus, Auchmobius, Araoschizus, Batulius, 

 Anepsius, Cryptoglossa, Euscbides, Embapbion, Dacoderus, Cysteodemus, Eupom- 

 pha, Phodaga, Amannus, Euryscopa, Calyptobium. 



e. Philotecnus, Acephorus, Thinopinus, Ancbomnia, Rhagodera, Physemus, Aph- 

 ricus, Plastocerus, Euthysanius, Malaehius, Microlipus, Atelestus, Cryptadius, 

 Nyctoporis, Ampbidora, Apocrypha, Cononotus, Coelus, Eulabis, Epantius, Bius, 

 Ccelocnemis, Prionycbus, Enipbyastes, Perarthrus, Ipochus. 



I. 



II. 



III. 



163 



163 



163 



69 



69 





25 a 





25 a 





13 



13" 



57 c 



25 d 



26 e 



TABLE OF SPECIES EXTENDING ACROSS THE CONTINENT. 



Column I. contains species found in the Rio Grande valley ; II. marks those from 

 Rio Grande valley to the Californian sierra ; III. those found in maritime California. 

 Brackets are used to denote that the species has been found in a region north of that 

 embraced in the present Report, but belonging to the same range ; it is therefore to be 

 inferred that such species will eventually be found within the limits here treated of. 



