24 Journal New York: EntoxMological Society [Voi. vii. 



more than twice as wide as long, widest Ijefore the base, where it is rather strongly 

 rounded, thence narrowing in nearly straight line to apical angles ; dorsal mpressions 

 moderate, surface rather closely punctate on the disk, more coarsely and densely at 

 sides. Elytra narrowing gradually from base, disk flattened, strise not impressed at 

 the middle of the disk, but evidently so at the sides and tip ; inters^als with the usual 

 series of fine punctures. Prosternum emarginate in front, the margin faintly sinuate ; 

 abdomen finely not closely punctate, last segment without trace of apical plate. 

 Length, 6.5-11 mm., .26-. 44 inch. 



Habitat : California (Los Angeles and San Bernardino Counties). 

 Ten examples. 



Some specimens, perhaps males, are less depressed and narrower, 

 but otherwise there is very little variation observable. The style of 

 maculation is very much like that in coquilletti, and the narrower forms 

 look greatly like that species ; the resemblance however is entirely su- 

 perficial. The lateral margin of the thorax is more or less distinctly 

 visible almost throughout from above. 

 A. dohrni Horn, Trans. Am. Ent. Soc, VII, p. 15, PI. I, Fig. 21. 



This species could scarcely be mistaken for any other though some 

 specimens of prorsa in which the anterior marginal spot of the elytra 

 is wanting, and the thorax less distinctly wider than the elytra than 

 usual, are not very different in appearance. The spots in dohrni are 

 however always reddish, and in prorsa never so. Dohrni is really 

 much more clo.sely allied to viariposa and it is doubtful if they are 

 really distinct. Aside from color — bronzed in dohrni and blue in 

 mariposa — the former is distinguished by the more transverse thorax 

 with sides more strongly rounded and as wide or a little wider slightly 

 in front of the base than at base, and the slightly stronger punctures 

 of the elytral striae. In typical mariposa of which I have seen but 

 three examples the thorax is widest at base and the sides are but little 

 rounded. These differences in thoracic outline are not more marked 

 than in several other species and there is before me a specimen which 

 both in color and in shape of thorax is an exact intermediate between 

 typical dohrni and mariposa. Both forms are as yet too rare in collec- 

 tions to warrant a definite conclusion as to their relationship. Length, 

 8-9.3 mm., .32-. 37 inch. 



Habitat: Sierras of California from Los Angeles to Mariposa 

 County. 



A. mariposa Horn, Trans. Am. Ent. Soc, VII, p. 22, PL I, Fig. 35. 



For reference to the transfer of this species from the Truncatae to 



the Emarginatae, see remarks prefatory to the present group. The 



