NATURAL SCIENCES OF PHILADELPHIA. 397 



C. duodecim-guttata occurs everywhere in the Pacific regions, ex- 

 tending into the valleys east of the Sierra Nevada. 



C. h y p e r b o r e a Lee. has been sent me by Mr. Wra. M. Gabb, 

 from the coast range near Santa Cruz. The markings of this spe- 

 cies vary in their width. The two specimens in my cabinet have 

 the markings distinct, while two in the cabinet of Dr. Le Conte 

 have the humeral lunule and the middle fascia so expanded as to 

 become confluent. I give a figure of the two varieties, with a view 

 of completing the series of illustrations of our species. 



C. pusilla Say was abundant in Owens Valley, in the beds of streams. 



C. haemorrhagica Lee. occurred with the last. It is remarkable that 

 a species hitherto found only on the sea coast at San Diego, should occur so 

 far inland. 



C. imperfecta Lee. has been sent me from Fort Vancouver, Oregon. 



C. guttifera Lee. occurred in tolerable abundance at Fort Grant, on the 

 San Pedro river, Arizona. 



Tetracha Carolina Hope occurred rather abundantly at Fort Yuma, 

 under chips, etc., on the borders of the Colorado. This insect has now been 

 found at almost every point from the central Atlantic coast of the United 

 States to Cape St. Lucas, at the southern extremity of Lower California. It is 

 probably found along the greater extent of western Mexico. For this and 

 many other species from this interesting region, 1 am indebted to Capt. John 

 E. Hill, of California. 



i 



Descriptions of some new genera and species of Central American COLEOP- 



TERA. 



BY GEO. H. HORN, M. D. 



MACROPNUS. 



Gen. Ch. Mentum quadrate, sides moderately rounded, slightly emarginate 

 anteriorly. Labial palpi small, last joint ovoid, acuminate. Maxillae armed 

 internally with six sharp teeth in two rows, palpi moderate, last joint larger, 

 ovoid, slightly curved, and grooved above. Mandibles tridentate at the ex- 

 tremity, with a somewhat flattened, vertical, slightly recurved tooth on the 

 upper surface. Epistome parabolic, slightly margined, broader than the front, 

 from which it is separated by a slightly sinuate suture. Thorax convex, sides 

 strongly rounded, base moderately lobed, angles distinct, the anterior more 

 prominent. Scutellum moderate, twice broader than long. Mesosternum 

 produced, plane. Elytra very convex, suboval. Legs robust, anterior tibia? 

 tridentate. Tarsi shorter than the tibia?, last joint with an angular process 

 beneath. Claws unequal, the outer more robust and forked. Pygidium large, 

 convex, vertical. 



Males. Posterior coxae very large and very prominent internally. Trochan- 

 ter prolonged into a spine, curved inwardly. Femora broad, oval, bidentate on 

 their lower edges, flat internally, convex externally. Posterior tibiae stout, 

 arcuate, densely pubescent internally, obliquely rugose and deeply punctured 

 externally, obliquely truncate, inner angle much produced. 



eras sip es, yellow, shining, head finely but sparsely punctured. Thorax 

 densely and finely punctured, with larger punctures at irregular intervals. 

 Elytra finely and densely punctured, obsoletely striate punctate, towards apex 

 more coarsely punctured. Beneath brown, scarcely shining, moderately 

 punctured and sparsely flavo-pilose. Length 1-07 inch. 



1866.] 



