by John Hewitt. 

 Order SCORPIONES. 



11 



Hadogenes trichiurus pallidus, Poc. 



We have adult male and female examples of this form from Weenen 

 (J. M. K. Chadwick and H. L. Bulcock). Though originally described 

 by Mr. Pocock as a distinct species (Ann. Mag. Nat. Hist., vii, 2, p. 

 198), it is clearly only a variety of trichiurus. It resembles H. 

 trichiurus coffer, Mihi, in most respects, but differs therefrom chiefly 

 in that the caudal segments of the male are not so slender as in coffer, 

 or as in whitei, being deeper in proportion to the length, and the 

 vesicle is bigger and stouter than in either of those species ; in the 

 male of coffer and of ivhitei, the upper margin of the fifth caudal 

 segment is almost straight and sub-parallel with the inferior margin, 

 whereas in pallidus it is more distinctly arched. The male vesicle in 

 its lower half has granular surfaces ; in coffer, the surface is either 

 quite smooth or may be more or less granulated. 



In the female the upper margin of fifth caudal segment is continu- 

 ously, though weakly, denticulated as in whitei ; in coffer, only a few 

 very weak denticulations occur. 



In the female of pallidus the terminal tooth of superior crest of 

 caudal segment IY is scarcely enlarged and certainly not subspiniform ; 

 in the female of coffer it is considerably enlarged and practically sub- 

 spiniform. 



Pectines. Male 18'20 mm.; female 14*16 mm. 



Measurements : 



Length first caudal segment 



Breadth ,, 



Height behind 



Length second 



Length third 



Length fourth 



Length fifth 



Height of second caudal segment 



behind to tip of spine 

 Length of carapace . . . 

 Length of movable finger 

 Length of vesicle 

 Breadth of vesicle 

 Depth of vesicle 



The specimens from Weenen are light brown in colour, being paler 

 than either coffer or whitei. 



$ 



9 



mm. 



mm. 



13-8 



7-35 



3-9 



3 



4-15 



31 



17-2 



8-8 



18-8 



9 



20-3 



10 



18-6 



4. 



10 2 



5-9 



3-9 



144 



13-5 



14 



135 



9-5 



8-1 



3 



2-6 



4 



31 



