558. SERKICOKNIA. 



V . Body narrower; penultimate joint of the maxillary palpi stouter than the 

 apical joint; prothorax more sparsely clothed with long fulvous hairs; 

 elytra less gibbous, more elongate, and feebly sulcate ; anterior tibiae 

 with the median tooth obtuse palpalis. 



b. Antennae with the fourth and following joints more or less acutely dilated at 



the apex; prothorax villose, the hairs pallid or fulvous; elytra at the base 



much broader than the prothorax. 

 c\ Elytra gibbous, rather short, attenuate. 



a". Elytra feebly sulcate ; antennae moderately elongate vagans. 



V. Elytra deeply sulcate ; antennae very elongate acutangulus. 



d'. Elytra flatter, elongate, subparallel ; antennae with the outer joints more 



strongly dilated at the apex amplipennis. 



c. Antennae moderately or feebly serrate from the fourth joint *. 

 e'. Prothorax villose. 



c". Elytra gibbous and strongly attenuate, at the base much broader than 

 the prothorax, the latter not twice as broad as long. 

 a!". Head, prothorax, and breast thickly clothed with very long blackish 

 or fuscous hairs ; eyes prominent. 

 a 4 . Elytra rather short, attenuate, deeply sulcate and striate .... guttiventris. 

 b i . Elytra elongate and abruptly attenuate, feebly sulcate .... hirticollis. 

 b"'. Head and prothorax clothed with very long fuscous hairs, the breast 

 with fulvous hairs ; elytra short and striate ; eyes small and not 



prominent calif ornicus. 



c ! ". Head, prothorax, and breast clothed with long pallid hairs ; elytra 



very deeply sulcate . , sulcipennis. 



d". Elytra more parallel, very little narrowed behind ; prothorax much 

 narrower than the elytra, twice as broad as long ; head, prothorax, and 

 breast with long fulvous hairs ; mandibles elongate, becoming slender 



outwards, with a short tooth near the middle acrognathus. 



/'. Prothorax clothed with shorter hairs, which are fulvous in colour, the 

 breast with long fulvous hairs ; prothorax nearly as broad as the elytra, 

 dilated anteriorly, and with short hind angles ; elytra oval, moderately 

 long ; antennae short and slender, distinctly serrate laticollis. 



d. Antennae with the joints from the fourth subparallel or very little dilated at 



the apex. 

 g'. Prothorax villose, the hairs long and semi-erect, 

 e". Prothorax not twice as broad as long. 

 d'". Elytra gibbous, attenuate. 



c\ Head, prothorax, and breast clothed with very long fulvous or 

 pallid hairs. 

 a 5 . Elytra short, not distinctly costate. 



The North-American S. estriatus, Lee., and S. ocreatus, Horn, no doubt belong to this section. 



