4o6 Memoirs on the Coleoptera 



thorax, the antennae inserted at four-sevenths, the first funicular joint 

 as long as the next three, the club oval, with its first joint less than half 

 the mass; prothorax barely a fifth wider than long, the sides subparallel, 

 broadly, feebly rounding from near the middle, the apex not constricted 

 or evidently prolonged and half as wide as the base, the basal lobe well 

 developed; punctures rather coarse, dense, somewhat confluent longi- 

 tudinally in part, the median line very narrow; elytra three-sevenths 

 longer than wide, at the feebly tumid humeri only slightly wider than the 

 prothorax, a little less than twice as long, the sides rather feebly con- 

 verging and arcuate to the somewhat obtusely rounded apex; striae very 

 deep, moderately coarse; intervals alternating in width from three to 

 four times as wide as the striae, very densely and confusedly sculptured 

 and squamose; male with the abdomen very feebly impressed medially 

 toward base and without modification of the dense vestiture. Length 

 (of) 4.1 mm.; width 1.75 mm. Kansas (Medora), — Knaus. One 

 example. 



This remarkably isolated species has some suggestive resemblance 

 to falsa, having an almost similar though still shorter beak, but the 

 prothorax is much more elongate and more coarsely, though less 

 densely, punctate, and has the median lobe of the base — absent in 

 falsa — very well developed ; it also differs in the broader lineiform 

 scales, and, in falsa, the strial intervals do not alternate in width in 

 the same way. With the Mexican tonsilis type it has less affinity, 

 the beak being more evenly cylindric and the body more parallel 

 in outline. 



There is before me an interesting series of allied forms from vari- 

 ous parts of Mexico and Central America; they have an elongate 

 rhomboid-oval convex body, rather smooth and sparsely clothed 

 above with more or less slender hair-like scales. In the subjoined 

 table they are all described as new and can be regarded as species 

 or subspecies according to the predilection of the cataloguer; they 

 can be held as subspecies of the first name given, or as subspecies of 

 tonsilis Boh., although, if the latter course is taken, I cannot 

 harmonize any of them with certain statements made by Boheman 

 in his description. For instance the pronotum is said to sparsely, 

 at the sides more densely, albido-squamulose, and the elytra at base 

 not at all wider than the thoracic base; these two statements are 

 not even approximately borne out in any of the six forms here 

 described, in all of which the loose lineato-squamulose thoracic 

 vestiture is distributed with perfect uniformity and is not in the 

 least different or denser toward the sides, and in all of them the 



