NORTH AMKRIUAN COLEOPTERA. 



141 



prolonged over the humeri, margins slightly explauate and coarsely roughly 

 sculptured, base narrower than the middle, disc convex, quite smooth, a moder- 

 ately strong impression at middle of base, surface sparsely indistinctly punctate 

 anteriorly. Elytra gradually wider two-thirds to apex, then rapidly narrowed, 

 humeri acute, surface with coarse not closely placed punctures arranged from 

 the suture in eight quite regular series, but at the sides quite confused, at apex 

 smooth : prosternura coarsely deeply and closely punctate, the apex acutely 

 oval : propleurai smooth. Abdomen coarsely, deeply, sparsely punctate near the 

 base; met-episterna longer than wide, smooth; epipleura well marked in their 

 entire length. Length .62— .80 inch. ; 15.5—20 mm. 



The figure given by Solier of M. punctata is a better representa- 

 tion of this new species than of that for which it was intended. 



It gives me great pleasure to give to this insect the name of one 

 who has so ably exposed the heteromerous fauna of Mexico and 

 Central America, Mr. G. C. Champion, of London. 



Three specimens were collected by the late W. M. Gabb during a 

 journey in the Peninsula of California. The precise locality was 

 not recorded. 



M. polita n. sp.— Of the same general form as inxquaUs, but more slender 

 and elongate, piceous black, shining with but few punctures or irregularities 

 above. Head sparsely coarsely punctate, subopaque. Thorax about a third 

 wider than long, sides strongly arcuate, base narrower than at middle, disc con- 

 vex, a basal depression opposite the scutellum, surface very shining and sparsely 

 punctate, at sides a little more punctate and opaque. Elytra smooth, very 

 sparsely punctate, disc with very vague traces of sulci ; epipleurse well defined ; 

 prosternum rather wide, obtuse at tip, coarsely granulate, propleuraj opaque, 

 sparsely punctate; met-episterna fully a half longer than wide. Abdomen 

 shining, sparsely punctate. Legs muricate. Length .60 inch. ; 15 mm. 



Readily known by its slender form and polished surface. 



One specimen kindly loaned by Mr. Chas. Dury, of Cincinnati, 

 collected in Arizona. 



M. ina^qualis Lee, Ann. Lye. v, p. 129; Lac, Gen. pi. 51, fig. 5 ; puncti- 

 coUis Lee, loc. <<it.— The sides of the thorax are here more arcuate, the hind an- 

 gles well marked, not prominent, disc convex, closely covered with acute gran- 

 ules, the middle of base depressed ; the elytral sculpture consists of intricate 

 elevations with punctate intervals, sometimes there is a vague tendency to form 

 costje. The entire underside of the prothorax is covered with coarse shining 

 granules, the prosternum moderately wide, the tip oval, sometimes subacute; 

 the met-episterna are nearly as wide as long and granulate; epipleurre well de- 

 fined in their entire extent. Length .54— .65 inch. ; 13.5—16.5 mm. 



Occurs in the southern parts of California, San Diego and eastward. 



M. morata Horn, Trans. Am. Ent. Soc. vii, 1878, p. 56.— Oval, narrower in 

 front, opaque. Head vaguely and not closely punctate, each puncture with an 

 elongate pale scale. Thorax one-half wider at base than long, narrower at apex, 

 sides feebly arcuate, hind angles prolonged slightly over the humeri, disc convex, 

 without median basal depression, surface moderately closely punctate, each punc- 

 ture with a scale. Elytra widest behind the middle, convex, the disc with three 



TKANS. AM. ENT. SOC. XX. JUNE, 1893. 



