Mar. .8,9 1 FaLL : ON AMERICAN SPECIES OF ACM/F.ODEKA. 33 



Habitat: California. The type from Mariposa, other examples 

 from Los Angeles county. 



An odd little species and apparently rare. 



A. guttifera Lee, Proc. Acad. Sc. Phil., 1859, p. 72. 



In the strongly sinuate sides of the elytra and shape of the pro- 

 thorax this species closely resembles vcrsuia ; it is however distinctly 

 larger and at once separable from this and every other species by the 

 extraordinary ventral character mentioned in the table. 



In the Leconte collection are three examples : the type from Fort 

 Tejon, California, the other two from Arizona. The type has the pro- 

 sternum noticeably retracted and with distinct prominences, the elytral 

 strife not impressed on the disk, the intervals uniseriately punctate, 

 the vestiture of the upper surface consisting of moderately long fine 

 erect hairs. In the Arizona examples both upper and under surface 

 are clothed with broad plumose recumbent scales, the form is stouter, 

 the stride impressed throughout, intervals more or less convex, the sutural 

 quite irregularly densely punctate, the second somewhat so and others 

 having a tendency toward irregularity though apparently offering only a 

 single series of punctures ; the posternum less markedly sinuate in 

 front, in one example nearly reaching the front angles, and in the 

 other falling a little short ; prothorax more densely punctate. These 

 differences would seem amply sufficient for specific distinction, but the 

 matter is complicated by the presence of a specimen collected at Big 

 Springs, Texas, by ^Ir. Wickham, in which the vestiture is as nearly as 

 possible intermediate between the two forms mentioned above, con- 

 sisting of semirecumbent squamiform seta^ which become hair-like on 

 the prothorax and broader, more recumbent and plumose at the sides 

 of the elytra ; the form narrower than in the Arizona specimens, the 

 prosternum more strongly sinuate than either and the elytral intervals 

 with single series of punctures which are however somewhat irregular. 

 It is not likely that the above forms represent three distinct species, at 

 all events it would not be wise to attempt their definition without a 

 much larger material than exists at present in collections. Length, 

 6.8-7 rnm., .27-. 28 inch. 



Habitat: California (Fort Tejon — Leconte, Los Angeles County 

 — Van Dyke), Arizona, Texas (Big Springs — Wickham). 



A. cribricollis Horn, Proc. Cal. Acad. Sci., IV, p. 375, PI. VII, 

 Fig. 4. 

 The cribrate punctate thorax distinguishes this species from all ex- 



