106 GEO. H. HORN, M. I). 



Male. — Front densely punctured, surface without callosities, except a slight 

 arcuate elevation on the vertex; anterior tibia (182) slightly arcuate, slightly di- 

 lated at apex and very finely serrulate within ; middle tibia arcuate, inner mar- 

 gin sen-ulate ; posterior tibia straight; last ventral segment (180) broadly con- 

 cave at middle, the apex deeply quadrangnlarly emarginate. 



Female. — Front very irregular and very coarsely punctate, a short median 

 carina on each side vaguely concave, vertex with feeble arcuate carina ; anterior 

 tibia very slightly arcuate, the middle and posterior straight ; last ventral seg- 

 ment (181) longer than in the male, sides slightly sinuate near the tip, the apex 

 sinuously truncate, the angles acute, the median line rather strongly carinate. 



This species is one of the hxrgest iii our faunii and is consjiicuous 

 by the purplish color of its surface, the well marked golden spots 

 and the very regular and even surface scul])ture. 



Occurs in Arizona, probably near the southern boundary. 



37. C Merliolii n. sp. — Form rather robust, piceous ; surface faintly bronzed, 

 feebly shining, beneath seneous or slightly cupreous; antennte seneous, more 

 slender to tip, the third joint rather longer than the next three; front rather 

 flat, very densely punctured, finely pubescent and cupreous in the male, slightly 

 convex, coarsely punctured, a well developed, ti-ansverse, biarcuate carina above 

 the antennae, and another above the middle of the front in the female ; clypeus 

 (184) broadly emarginate at middle, arcuate each side; thorax twice as wide as 

 long, widest one-third from apex, sides abruptly broader in front then oblique to 

 the base ; disc moderately convex, with a post-apical depression, another near 

 the front angles, another at base, surface finely punctured at middle, more densely 

 and subconfluently near the sides ; elytra wider than the thorax, parallel, arcu- 

 ately narrowed at apical third, the margins serrate, the apices acuminate ; disc 

 moderately convex, with the costse all distinctly elevated, the first extending in 

 front of middle and becoming a smooth line prolonged into the basal fovea, the 

 second at apex joining the fourth, extending forward without interruption to 

 the outer side of the basal fovea, third sometimes arising from the second one- 

 third from apex, extending forward interrujited by a fovea and gradually passing 

 under the humeri, fourth less elevated than the others and close to the margin ; 

 basal fovea moderately deep, humeral depression distinct ; a cordate fovea, 

 densely punctured near the tip of the third costa, another in front of middle, 

 indistinctly defined, divided by the second costa ; surface between the costae mod- 

 erately densely punctate, coarser and sparser in the scutellar region ; body be- 

 neath rather coarsely punctate, more closely at the sides of the abdomen ; poste- 

 rior angles of ventral segments conspicuously prominent, the sides with feeble 

 callosity; margin of last ventral segment not serrate, slightly sinuate at the 

 apical third, a distinctly elevated serrate ridge rather distant from the margin ; 

 anterior femur with a relatively feeble notch, not serrate ; prosternum truncate 

 in front. Length .60 - .66 inch ; 15 - 16.5 mm. (Fig. 183.) 



Hale. — Prosternum slightly convex at middle, with a few coarse punctures, the 

 anterior angles more densely punctured and slightly pubescent ; anterior tibise 

 (187) slightly arcuate, not dilated at tip, the inner edge multidenticnlate, the 

 middle tibia similar; posterior tibia straight; last ventral segment (185) broadly 

 sulcate at middle, deeply emarginate at apex, the angles prolonged and obliquely 

 truncate ; last dorsal coarsely, sparsely punctate, entire. 



