TRAP-BOOR SPIDERS. 259 



in development in the two sexes, differences of 

 this nature occur. In the present genus, the male 

 has an almost flat caput, while the female has a 

 strongly elevated one ; and with respect to the varia- 

 tion in the tarsal claws, no special weight can be 

 attached to it in the present instance, since these 

 €laws ar« not uniformly denticulated in the different 

 feet of the same individual. Another difference is the 

 absence in the male of sundry small but distinct 

 tooth-like spines at the apex of the labium and the 

 inner corner of the base of the maxillse ; the female 

 is also wanting in regard to the very characteristic 

 transverse indentation which divides the caput of the 

 male into two parts. I can, however, trace in the 

 female the slightest possible corresponding depression, 

 scarcely amounting to an indentation, and placed 

 rather nearer to the junctional thoracic pit. 



With regard to the differences between this species 

 and Ct. Sauvapi, Jj^ir. [Ct focUens, Walck.), size alone 

 would suffice to distinguish them ; two females of the 

 latter now before me measuring 13 lines in length; 

 while the male {Aran. nouv. on pen connus dii Midi de 

 r Europe, par Eugene Simon, Mem., Liege, 1873) 

 measures 8 lines (17 mm.) and the female rather over 

 14 lines (30 mm.), the fore-central eyes in the female 

 of Ct. Sauvagii appeared to be smaller than those in 

 Ct. Moggridgii and placed rather farther forwards, but 

 the eyes in both are otherwise remarkably similar 

 both in size and position. The males, however, 

 cannot be confounded inasmuch as, according to M. 

 Simon, no trace of any transverse indentation on the 

 caput exists in Ct. Sauvagii. 



The denticulation of the tarsal claws in the females 



