564 SEEEICOENIA. 



In M. Bene Oberthiir's collection there are three males of a Scaptolenus which seem 

 to be referable to this species, the type of which I have not seen. These specimens differ 

 from S. revestitus in having the antennal joints 4-10 more distinctly serrate, and the 

 thorax relatively narrower, less dilated at the sides anteriorly, and clothed with long, 

 erect, fulvous hairs. 



10. Scaptolenus acrognathus. (Tab. XXV. figg. 8, 8 a, s .) 



S . Elongate, moderately broad, a little narrowed behind, rather shining ; head and scutellum black, the 

 mandibles eastaneous, black externally and at the tip, the antennae brown, with the basal joints black, 

 the prothorax piceous, paler at the sides, the elytra pitchy-brown, paler near the scutellum, the body 

 beneath and the femora flavous, the tibia) and tarsi piceous ; the head, prothorax, scutellar region, breast, 

 and femora somewhat thickly clothed with very long fulvous hairs, the ventral segments with long 

 scattered hairs, the rest of the elytra sparsely pubescent, the margins fimbriate. Head coarsely, sparsely, 

 unequally punctate, the eyes moderately large and prominent ; maxillary palpi with the apical joint 

 slightly longer than the preceding ; mandibles very long and curved, stout at the base, becoming slender 

 outwards, each with a very short but distinct tooth on the inner edge a little beyond the middle ; antennae 

 rather short, joint 3 about twice as long as 2, 4 nearly twice as long as 3, the joints from the fourth 

 gradually becoming more produced at their inner apical angle, 11 obliquely truncate at the tip. Prothorax 

 very short, twice as broad as long, rounded and somewhat dilated at the sides anteriorly, appearing 

 slightly constricted behind, with excessively long, slender, divergent hind angles ; the surface thickly, 

 coarsely punctate. Scutellum thickly punctured. Elytra about three and one-half times the length of 

 the head and prothorax, and one-half wider than the latter, moderately gibbous at the base, and flattened 

 on the disc, narrowing from the shoulders downwards, the sides almost straight ; sulcate from a little 

 below the base to the apex, with the interspaces moderately raised, and somewhat thickly, finely 

 punctate. 



Length 15|, breadth 5f millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 



One specimen. Allied to S. amplipennis, but differing from it in having the antennae 

 shorter, with the outer joints less produced at the apex ; the mandibles much longer, 

 more curved, and toothed within ; the thorax shorter ; the elytra less elongate and 

 more narrowed behind (when closed), with the interstices more convex and more 

 rugulose ; and the maxillary palpi shorter and stouter, the apical joint being slightly 

 longer than the preceding. The form of the antennae distinguishes it at once from 

 S. brevicollis. In S. acrognathus the mandibles are longer, more acute, and less 

 abruptly curved inwards than in any of the allied forms. 



11. Scaptolenus laticollis. (Tab. xxv. figg. 9, 9 a, 6 .) 



S . Elongate, broad, strongly narrowed behind, shining ; eastaneous, the basal half of the head black, the 

 elytra, except along the margins and suture, gradually becoming darker from about the middle onwards, 

 the mandibles eastaneous, black at the tip, the antennae and palpi ferrugineo-testaceous, the body beneath 

 luteous, the femora flavous, the tibiae rufescent, the tarsi darker ; the head, prothorax, and scutellar 

 region somewhat thickly clothed with moderately long fulvous hairs, the femora and breast with longer 

 similarly coloured hairs, the rest of the elytra sparsely pubescent, the margins fimbriate. Head coarsely, 

 thickly punctate, the eyes very large and prominent ; maxillary palpi with the apical two joints equal in 

 length; mandibles moderately long, abruptly bent inwards at the middle, stout at the base, acute at the 



