336 PROCEEDINGS OF THE ACADEMY OF 



A very few are closely allied to, and perhaps identical with described Mexican 

 species, but the number is very small. 



Some of the more conspicuous and peculiar species are described below : 

 enough has been stated to show that the affinities of the fauna are with that of 

 the region extending from the Colorado Desert across to the Rio Grande valley, 

 thereby confirming the results obtained* by Prof. Baird and Mr. Copef from 

 the study of the vertebrata collected by Mr. Xantus. 



The limited number of species of those two classes precludes the possibility 

 of the occurrence of many new forms in the region here treated of; but in the 

 number of peculiar species of the much more extensive class of insects seen in 

 Mr. Xantus' collections, we recognize that Lower California constitutes one or 

 more provinces of the Interior district, as defined by me in the introduction to 

 my synopsis of the Coleoptera of Kansas and New Mexico. J 



The preponderance of Tenebrionidre, both in genera and species seen iu the 

 fauna of Upper California and Arizona has here been partially destroyed. The 

 genera which survive are, however, such as are already known from the last 

 mentioned region. None of those peculiar to maritime California have as yet 

 occurred. 



Megasoma Kirby. 



M. T h e r si te s, piceo-niger ; ^ sordide pubescens, capite cornu elongato 

 apice bifurco, thorace dense punctulato, angulis auticis acutis divaricatis, cornu 

 brevi apice emarginato, elytris punctulatis et obsolete punctatis ; 9 punctata, 

 thorace glabro eljtris parce pubescentibus, basi glabris. Long. 1-18 1-40. 



Cape >an Lucas. Very much smaller than the other species, of which it ap- 

 proaches most nearly to M. Hector, but the anterior angles of the thorax are 

 divergent. 



Edryomia Burm. (emend. Lac.) 



Eu. f a s c i f e r a , nigra, clypeo apice truncato et late reflexo, thorace latitu- 

 dine haud breviore, lateribus obliquis parum rotundatis, nigro nitido, parce 

 punctato, margine basali lateribusque flavis, his puncto nigro ante medium no- 

 tatis, elytris opacis, a humeris paulo angustatis, margine humerali fasciis dua- 

 bus latis apiceque flavis, pectore abdominisque lateribus pallide pilosis. Long. 

 66. 



Cape San Lucas. 



Chalcolepidius Esch. 



C. rubripennis, niger, squamulis minutis aureo-smaragdinis dense tec- 

 tus, thorace latitudine fere sesquilongiore, lateribus rotundatis, angulis posticis 

 brevibus divergentibus, elytris rubris, striis nigris punctatis, interstitiis paulo 

 convexis. Long. 1-11 175. 



Cape San Lucas. A specimen also sent as found at Cajon Pass, California. 

 Belongs to the group of the genus, having the scutellum triangular, slightly 

 emarginate in front, and the third joint of the antennas equal to the fourth. The 

 antenna are serrate in both sides. 



Lycus Fabr. 



L. cruentus, laete coccineus, thorace latitudine breviore, apice carinato, dein 

 fivea rhomboidea impresso, elytris postice sensim dilatatis thorace duplo la- 

 tioribus, margine costisquequatuor parum elevatis, interstitiis rugose punctatis, 

 a dodrante ad apicem nigris, tibiis tarsis antennis capiteque nigris, hoc angusto 

 thorace haud breviore. Long -37 - 53. 



Cape San Lucas. The elytra of the females are less dilated behind so as to 

 be only one half wider than the thorax. 



* Proceedings Acad. Nat. Sci. 1859, 299. 

 tlbid, 1861, 305. 



I Smithsonian Contributions, vol. xi. p. iv. (These results are also alluded to on page 

 49 of these Proceedings for 1860.) 



[Nov. 



