216 GEORGE H. HORN, M. D. 



The epipleurae are quite smooth, the propleurse sparsely punctate, 

 and it is probably by a slip of the pen that Crotch stated that the 

 epipleurre are punctate. 



Collected at Cape San Lucas, Penins. Cal, by John Xantus. 



M. iiiterriiptuni Say, Jouru. Acad. iii. p. 448: ed. Lee; ii. p. 215.— Oblong, 

 yellowish or pale brownish testaceous, each elytron with two oblong piceous 

 spots (which are often absent) body beneath testaceous, brownish or piceous 

 black. Head sparsely punctate, a distinct frontal impression, frontal suture not 

 excavated. Antennae testaceous, slightly darker externally. Thorax nearly a 

 half wider than long, slightly narrower in front, sides strongly arcuate, angles 

 prominent, disc finely, rather sparsely punctate, smoother along the middle. 

 Elytra striato-punctate, strife regular, except near the scutellum and the short 

 strife exterior to the seventh, punctures finer toward the apex, intervals smooth. 

 Propleurfe usually with a few punctures posteriorly, met-episterna with few fine 

 punctures. Abdomen finely sparsely punctate. Legs pale testaceous. Length 

 .•20— .24 inch.: 5—6 mm. 



This species shows no signs of a tooth on the posterior femur, but 

 two specimens in the six before me have a small tooth on the front 

 femur. It is possible that specimens may occur with a tooth on the 

 posterior femur, in which case the}' might seem allied to calif ornlcmn, 

 which it resembles in color and form. As in that species the punc- 

 tuation of the thorax is variable from fine to comparatively coarse. 

 The elytral piceous spots when present are on the fifth and sixth 

 intervals, the one in front of middle, the other equally distant pos- 

 teriorly. 



Occurs in Dacota, Kansas and Arizona. 



M. angn$>itulum Crotch, Proc. Acad. 1873, p. 41. — Oblong, moderately 

 convex, beneath piceous black, upper side, legs and base of antennfe yellowish 

 testaceous. Antennfe pale at base, the outer six joints black. Head sparsely 

 punctate, more coarsely and closely on the clypeus, median frontal impression 

 variably distinct. Thorax one-third wider than long, slightly narrowed in front, 

 angles feebly prominent, sides not strongly arcuate, disc convex, sparsely not 

 coarsely punctate: scutellum sparsely punctate, sometimes opaque. Elytra 

 striato-punctate, the first five strife regular, the others more or less confused : 

 intervals smooth, punctures a little less distinct toward the apex. Propleurae 

 smooth, sides of metasternum and abdomen sparsely finely punctate. Length 

 .23— .25 inch. ; 6— 6.5 mm. 



This species has a form not unlike interruptum and californicinn. 

 No well marked sexual peculiarities have been observed, although 

 two specimens presumed to be males have a more slender form, and 

 the ventral segments are flatter. 



In the material before me I observe no variation, although Crotch 

 mentions .several varieties, but I am convinced that he has mixed 



