553 IVAR TRÂGÂRDH 



Distribution : Ttaly, Netherlands. 



My spécimens agrée well with the description given by 

 OuDEMANS (1901, p. 43-44) ; there are only the folio wing 

 additions to be made. 



Female. 



Longth : 900 u. Width : 540 y. 



Colour, chestnut-brown. 



Dorsal side. AU the hairs, except 4 pairs, are beautifully 

 feathered ; of the 4 setifotm pairs, 3 are placed in the anterior 

 half, near the middle ; one pair near the posterior margin. In 

 figure 61 a et 6 one of the vertex-hairs and one from the pos- 

 terior margin of the dorsal shield are delineated. 



Ep'istoma (fig. 62); the lobes of the «fish-tail » are narrower, 

 with longer tips than in Oudemans' spécimen. With regard 

 to it Oudemans says (p. 44). « I am doubting of the fact 

 whether the médian bifurcate appendage is planted on the base 

 of the fish-tail shaped lip, or it the itself is bifid, like that 

 of 31. marginatus, pisentii, terreMS etc. » Even with the use 

 of oil-immersion I hâve failed to see that the trunk of the 

 médian appendage continues underneath the fish-tail. It is 

 a prolongation of the edge of the fish-tail itself. 



Mandibles (fig. 63). Thèse are not described by Oudemans. 

 Of the three teeth, t3rpical for the lower jaw of most Holostaspis 

 species, the médian one is very small, and the posterior one is 

 placed in the distal third ; upper jaw with large subterminal 

 tooth, as long as the terminal one ; behind this, a low, rounded 

 })lade ; and behind this, a perpendicular tooth, almost as large 

 as the subterminal one ; behind this an excavation opposite 

 the posterior lower tooth ; and the.n a low tooth. 



Pilus dentarius, pilus basalis and flagellum of the 

 shape typical and characteristic of the genus. 



Ventral side (fig. 64). The shields hâve the same net-like, 

 areolated texture as the dorsal side. Sternal shield with the 

 usual 3 pairs of hairs, inserted one pair at the anterior edge, 



