214 GEORGE H. HORN, M. D. 



puDctures variable, usually closely placed, much less distinct at apex, intervals 

 very finely sparsely punctate. Body beneath somewhat darker than above; 

 propleurje smooth, metasternum at sides sparsely punctate, abdomen sparsely, 

 finely and indistinctly punctate. Legs always pale. Length .16— .22 inch.; 

 4 — 5.5 mm. 



As in the preceding species this has the two short strife exterior to 

 the seventh much confused. It resembles some of the immaculate 

 forms of interrupta, but differs in the character of the short striee, 

 and by the hind angles of the thorax being broadly rounded. 



Occurs in California and Arizona in the vicinity of Fort Yuma. 



M. tistuni Lee. — Oblong, pale castaneous, usually the thorax is darker, 

 shining. Antennfe entirely pale. Head almost absolutely smooth, a distinct 

 frontal impression, clypeus indistinctly punctate. Thorax one-fourth wider than 

 long, narrowed in front, sides strongly arcuate, angles distinctly prominent, disc 

 convex, almost smooth, the punctures being fine, sparse and indistinct. Elytra 

 striato-punctate, the punctures coarse, but not close near base, becoming rapidly 

 finer and indistinct near apex, the short strife regular. Propleurje and sides of 

 metasternum smooth, abdomen sparsely i)unctate. Legs rufo-testaceous. Length 

 .18— .22 inch. ; 4.5—5.5 mm. 



This species is the largest at present known among those with the 

 small tooth on the hind femur. The two short striae exterior to the 

 seventh, although composed of small punctures, are regular and not 

 at all confused. 



Occurs in southwestern Texas. 



BI. alerriiniini n.sp. — Oblong, piceous black, shining, under side of femora 

 and the tarsi rufescent. Antennse piceo-rufous, paler at base. Head black, 

 labrum and a spot near the eyes rufescent, front rather coarsely sparsely punc- 

 tate, denser on the clypeus, frontal impression indistinct. Thorax one-third 

 wider than long, slightly narrower in front, sides broadly arcuate and narrowly 

 margined, angles prominent, disc convex, coarsely punctate, not coarsely nor 

 closely, smoother along the apex. Elytra striato-punctate, the punctures coarser 

 and closer near the base, much finer toward apex, the two short striae regular. 

 Body beneath smooth and shining, abdomen sparsely punctate. Length .24 inch. ; 

 fi mm. 



The four specimens before me, received at various times, agree in 

 all particulars. The very distinctly punctate head and thorax will 

 readily distinguish it from any of the species in near association 

 otherwise, except sidurale, which is of shorter form, differently and 

 with less distinctly punctate thorax. 



Occurs in New Mexico, Luna (Wickham), Santa Fe (Gisler). 



in. suturale Lee, Proc. Acad. 1858, p. 85.— Form moderately robust, pice- 

 ous black, shining ; elytra pale castaneous or rufo-testaceous, with a broad sutural 

 black stripe. Antennse rufo-testaceous, darker externally. Head piceous, a large 



