CERAMBYCID/E 223 



broadly rounded, with the apex in about a third the total width, 

 becoming gradually transverse and fimbriate; in debile the fifth 

 segment is only twice as wide as long, evenly trapezoidal in form, 

 the rectilinearly truncate apex rather more than half the basal 

 width and fimbriate with shorter hairs. 



*Mallodon baroni n. sp. Female more elongate and parallel than the 

 same sex of dasystoma, black, the elytra and entire hind body pale 

 brownish-rufous, shining; head nearly as in debile; antennae a little longer, 

 extending to basal two-fifths of the elytra, the third joint much more 

 than twice as long as wide; prothorax similar in general form, with the 

 sides anteriorly converging and feebly arcuate throughout but less 

 transverse, the lateral spines a little longer and that nearest the base 

 more prominent; surface with a large minutely, sparsely punctate swelling 

 at each side anteriorly from a little behind the middle, the intervening 

 concavity strongly and loosely punctate and with a few coarser punctures 

 on the posterior slopes of the swellings; laterally the surface is declivous, 

 coarsely, densely punctato-rugose and duller, with an inner fine shining 

 ridge and another, more lateral and oblique, from slightly before to 

 slightly behind the middle; elytra a little more than twice as long as 

 wide, a fourth wider than the prothorax, the sides parallel, very feebly 

 arcuate and just visibly converging from well behind the middle to the 

 obtuse apices, dehiscent in nearly apical half, the sutural spines well 

 developed, very aciculate; surface obsoletely rugulose, with a broad 

 shallow impression near each side from well behind the humeri, evanescent 

 apically. Length 35.0 mm.; width n.8 mm. Mexico (Guerrero), 

 Baron. 



The type differs from the female of dasystoma in its narrower 

 form, structure of the pronotum, coloration and in the form of the 

 fifth ventral, which is here similarly transverse and broadly rounded, 

 but with the apex becoming medially sinuate in about half the 

 total width. Spinibarbe and molarium are much larger species, and 

 it would seem not to be identical with anguslatum Thorns., as the 

 gense are said by Bates to be obtusely tridentate in that species; 

 in baroni the gense are strongly and sharply angulate medially, 

 with the angles at the base of the large angle, and forming the 

 anterior limit of the nearly parallel sides of the genae, only very 

 slightly and obtusely prominent; so the language "obtusely 

 tridentate" could not very well be construed to apply. The tri- 

 angular median tooth at the apex of the genae is relatively much 

 larger than in either dasystoma or debile. 



