ij) R. SHELFORD 48 1 



Gen. Isoniscus Borg. 



27. Isoniscus scaber sp. n. 



9. Convex, with a dense sericeous grey pile above and num- 

 erous erect tufts of minute scales, so that the upper surface 

 appears pustulose. Head with'sericeous pile, eyes less wide apart 

 than the antennal sockets, ocelli absent. Antennae rufescent in 

 basal third, remainder fuscescent except for 4 testaceous joints 

 immediately before the apex. Pronotum with anterior margin 

 faintly emarginate in the middle, the posterior angles of all the 

 tergites produced, but much less so than in /. sjostedtl Borg. 

 Supra-anal lamina trapezoidal, narrower at base than at apex, 

 posterior margin rounded. The margins of the tergites overlap 

 the sternites. Abdomen beneath nitid, disc rufescent. Legs ruf- 

 escent, outer margins of tibiae darker, tibial spines in 3 rows 

 stronger and longer than in /. sjostedtl., tarsal arolia absent. 



Length 17 mm.; pronotum 5-9 mm. X 9 mm. 



1$. 



This species shows that the natural position o( this genus is in 

 the Pcrisphacriinae and not in the Paiichlorinac as suggested by 

 Borg; Isoniscus sjostedtl is an aberrant species in which the Perl- 

 sphaerllne characters are masked. 



Madrid, i.° de Junio de 1909. 



Mem. Soc. esp. Hist, uat , i, 1909. 



