AMERICAN COLEOPTERA. 113 



Antennae serrate in the males. 



Elytra simple at tip in the two sexes. 



Second joint of antennas similar in length and form to third sciiciis. 



Second joint of antennae much shorter than the third biguttulus. 



Elytra appendiculate in the male auritus. 



Antennae pectinate in the males. 



Elytra appendiculate in the male mirandus. 



Elytra not appendiculate in the male. 



Elytra shining blue, tipped with yellow mi \1 sis. 



Elytra black Ulkei. 



]M. sene.US, Linn. Fauna Suecc. 1761, 202; Erichs. Mon. 66.— The head and 

 thorax are metallic green, the labrum and apical angles of thorax pale yellow- 

 ish. The elytra are in great part red, with a common triangular metallic green 

 space, including the entire base of the elytra, the sides converging to a point 

 near the appex. The under surface is black with a metallic tinge and the 

 legs similar in color to the thorax. Length .24 — .32 inch; 6 — S mm. 



Occurs in the New Pingland States. Au introduced species in our 

 fauna. 



M. auritus, Lee. Proc. Acad. 1852, p. 165. — Head and antennae black. Tho- 

 rax rufous with large discal black spot, occasionally with lateral margins only 

 rufous. Elytra bluish, sub-opaque, rarely with a greenish tinge, surface with 

 usually two indistinct costae; tip in male, of similar color to the remainder of 

 surface, appendiculate; female tipped with rufous. Under surface and legs 

 black with faint metallic tinge. Length .20 — .30 inch ; 5 — 7.5 mm. 

 Occurs in California and Oregon. 



M. biguttulus, Horn, Trans. Ent. Soc. 1870' p. 87. — Head and antennae 

 black. Thorax black, shining, with a tinge of green. Elytra metallic blue, 

 shining, with a small yellow smooth spot on each near the apex. Legs and 

 under surface black with a slight tinge of blue. Length .14 inch ; 35 mm. 



Resembles mirandus in form, but has a totally black thorax, more 

 shining and not appendiculate elytra. In all our native species of 

 Malachius the second joint of the antennae in both sexes is smaller 

 than the third and usually of an oval form. 



One specimen from Fort Tejon, California. 



M. lllixtus, n. sp. — Head black, very shining, smooth and with a slight 

 longitudinal impression within the antennae. Antennae black, strongly pecti- 

 nate in the males and strongly serrate in the females. Thorax somewhat broader 

 than long, very smooth and shining, black, lateral margin red. Elytra slightly 

 broader at base than the thorax and feebly expanding to apex; color brilliant 

 blue, shining, apices in both sexes tipped with reddish yellow; surface slightly 

 scabrous. Under surface and legs black, with tinge of blue. Length .14 — .18 

 inch ; 3.5 — 4.5 mm. 



Two specimens from California. The female resembles that of 

 auritus, but is much more shining and has its antennas very nearly as 

 strongly serrate as those of the male of that species. From mirandus 



TRANS. AMER. ENT. SOC. IV. (15) OCTOBER, 1872. 



