Superfamily Argiopoidea 



slits; the posterior edge of this plate is densely 



chitinized. Epigynum with a single round object 



behind on the middle line. G. pedorosa 



CC. Posterior edge of the epigastrium not so prominently 



prolonged behind. Epigynum with two oval objects 



behind. G. saltabunda 



Gayenna celer (G. ce'ler).— - The epigynum (Fig. 634) is 

 longer than wide. The central part of it consists of three sclerites; 

 a transverse one in front; an intermediate one, which is narrower 

 and longer, and tapered toward its hind end; and a smaller one 

 behind. The first two of these sclerites are dark in colour; the 

 third is light. On each side of this series of sclerites, there is a 

 curved one, which is enlarged behind and tapered in front. 



The palpus of the male of this species resembles that of G. 

 pedorosa in that the tibia is not greatly elongate; but it differs 

 in that the terminal apophyses are comparatively long (Fig. 635). 



Gayenna pedorosa (G. pec-to-ro'sa). — The epigynum (Fig. 

 636) is wider than long. There is a single, round object behind, 

 on each side of which there is a curved sclerite. The most striking 

 feature of this region is the fact that the posterior edge of the 

 epigastrium is prolonged behind over the epigastric furrow into 

 a plate, which is lobed on each side, and which extends to the 

 lung-slits; the posterior edge of this plate is densely chitinized. 



In this and in the following species the tibia of the palpus 

 of the male is not greatly elongate. In this species the terminal 

 apophyses of the tibia are comparatively short (Fig. 637). There 

 are two apophyses on the lower side of the coxa of the third leg, 

 and one on the lower side of the coxa of the fourth leg. 



Gayenna saltabunda (G. sal-ta-bun'da). — The epigynum 

 (Fig. 638) is wider than long. It is sharply distinguished from 

 that of G. pedorosa by the presence of two oval objects, behind, 

 on the middle line. The posterior edge of the epigastrium bears 

 some resemblance to that of G. pedorosa; but it is not so distinctly 

 prolonged behind into a plate with a chitinized edge. 



The male differs from the males of the other two common 

 species in the greater length of the tibia of the palpus (Fig. 630 1, 

 which is about three times as long as the patella. The terminal 

 apophysis of the tibia appears to arise before the middle of the 

 length of the tibia; this is due to the fact that it is situated at 



563 



