76 ON SOME RARE ARACHNIDS 



produced in front, but this production is very short, being 

 soon obliquely truncated. The truncation is parallel with the 

 lower border of the patella when that joint is flexed fairly 

 strongly on the femur. The posterior part of the lower border 

 is gibbous, and provided with setae. The base of the 

 trochanter is constricted, stalk-like, and very narrow. The 

 femur is "33 mm. long by '175 mm. broad. The lower margin 

 is convex, the apex of the hump formed being about the 

 centre. "Wx^ patella is "33 mm. long by "12 mm. broad. The 

 tibia is "33 mm. long, the tarsus "15 mm. long; and the 

 terminal claw is curved, and about "075 mm. in length. 



The FIRST LEGS are long, slender, and palpiform. The 

 lengths of the joints are as follows : — Trochanter '25 mm., 

 femur '8 mm., patella "95 mm., tibia "] mm., metatarsus 

 •25 mm., tarsus "35 mm. The terminal joint of the tarsus 

 is longer than the next two taken together, but not as long as 

 the next three. The total length of each first leg is 3*3 mm. 



The FOURTH LEGS. — The total length is 2-75 mm. The 

 lengths of the joints are as follows : — The trochanter '25 mm. 

 'Y\v& femur '^^ mm. by '38 mm. broad; the femora are thus 

 enormously thickened, and are hardly twice as long as broad. 

 The patella and tibia together measure -9 mm. The tarsus 

 and metatarsus together measure '85 mm. In colour the legs 

 are brown, the femora, especially the fourth, being dark 

 like the tergites, whilst the terminal joints are pale like the 

 sternites. 



Trithyrezis Bagnallii differs from all known Tartarides (save 

 one) in its possession of distinct, convex, vitreous ocelli. Of 

 the other species some are quite blind, whilst others possess 

 flat, badly defined eye-spots. Trithyreus Cairibridgii (Thor.), 

 however, possesses true eyes, but these are more convex than 

 in the present species, and quite round. Professor Hansen 

 informed me of this in a letter ; he does not mention it in his 

 monograph.* 



* Op. cit. 



