8o MEMOIRS ON THE COLEOPTERA 



as the tibiae. Length 20.0 mm.; width 8.2 mm. Florida (a single 

 example from an unrecorded locality) opacipennis n. sp. 



8 Humeral carina long; elytra at base gradually more broadly sloping 

 outwardly at each side to the long carina, the punctures, when 

 present, in geminate series 9 



Humeral carina short; elytra at base sloping convexly and evenly or 

 subevenly throughout the width to the basal margin; punctures, 

 when evident, arranged in single widely separated series or in gemi- 

 nate series 19 



9 Elytra with alternating strong and feeble ridges throughout the 

 width; sides of the prothorax broadly rounded to just before the 

 basal angles, where there is a very short sinuation 10 



Elytra having the surface even and without lateral ridges; sides of the 

 prothorax varying in basal sinuosity; upper surface often rather 

 strongly depressed (cf ), a little more convex ( 9 ) n 



Elytra smooth to moderately costulate but always having two conspicu- 

 ous lateral ridges; sides of the prothorax abruptly sinuate before 

 the sharp basal angles though only for a very short distance. . . . 18 



10 Body elongate-oval, rather depressed in both sexes, a little stouter 

 and with more shining and more convex head and pronotum in 

 the female, these being subopaque in the male, the elytra opaque in 

 both sexes, with the ridges shining; head large, with deep and linei- 

 form impressions, the mandibles partially strigose, rather more so 

 in the female; labrum short, subtruncate, sparsely and longitudinally 

 strigose, the strigae often effaced medially, where the median lobe 

 is very much broader than in the preceding groups and truncate or 

 feebly bilobed; prothorax rather more than one-half wider than long, 

 the base but little (cf ), or not at all (9 ), narrower than the apex, 

 the sides broadly rounded; basal angles right, rounded ( 9 ) or sharp 

 (cf); lateral bead narrow, only slightly thickened posteriorly and 

 continuing to the base; lateral groove feebly violaceous, rather wide, 

 still broader posteriorly but abruptly terminating some distance 

 before the base, the four subbasal impressions distinct; stria strong, 

 the basal groove irregular; surface depressed and opaque (cf), 

 convex and polished (9 ),. elytra two-fifths longer than wide, nearly 

 similar in the sexes, the intermediate ridges fine and faint, sometimes 

 wholly obsolete, always abbreviated, the two lateral ridges sharper; 

 lateral margin rather broadly concave, black or faintly violaceous; 

 posterior tarsi (cf) long, much longer than the tibiae, or ( 9 ) much 

 shorter and only four-fifths as long as the tibiae. Length (cf 9 ) 

 27.0-30.0 mm.; width 10.0-11.0 mm. Florida. Five examples. 



marginatus Fabr. 



Body shorter and much stouter, with still greater sexual disparity, 

 moderately convex (cf), much stouter and strongly convex (9), 

 opaque throughout in both sexes, the elytral ridges much feebler, 

 the alternate ones less unequal and all, except the two marginal, 

 alutaceous and not shining as they are in the preceding; head 

 relatively not quite so large, less than three-fourths as wide as the 

 prothorax, the impressions not so deep, the labrum and mandibles 

 nearly similar, except that the middle lobe of the former is more 



