16 



gel lïirther verilU-alion of this remarkable "lad". The cuiiiparalivc length of the 

 galea is sometimes of value in the identification of the species as well as of the 

 sex, it is therefore often of practical value (cf. Thorell 6. p. 32) to compare its 

 length with that of the terminal hair of the movable finger (cf. Chelifer Murraifi 

 Poc. (PI. Ill, figs. 8d-e), Ch. Birmanicus Thor. (PI. IV, figs. 4c-d) and Garypinus 

 nobilis n. sp. (PI. II, figs. 8c-d)). As the galea differs in structural features of more 

 essential as well as of minor interest, it becomes valuable in the definition of both 

 subfamilies, genera and species; the character found in its presence or absence is 

 of paramount importance in the subfamilies of the Hemictenodactyli. In contrast to 

 several other organs of the antennae viz. the serrula exterior, we find no gradual 

 development, going from Chthoniiis C. K. to Chelifer Geof., but it is nevertheless 

 interesting to notice, that the galea of the Hemictenodactyli is wanting or almost 

 simple, slightly more developed in Olpium L. K., and much more so in most forms 

 of Garypiis L. K. and Chelifer Geof.; those forms of Garypiis L. K. viz. G. irrugatiis 

 Sim. in which it is so exceedingly simple seem to be degraded from those with a 

 more developed on. 



Serrula exterior. The serrula exterior of the movable finger, the different 

 structure of which gave Balzan the idea of naming his two suborders, the Hemi- 

 ctenodactyli and the Panctenodactyli, shows great differences, if we compare that of 

 Chthoniiis C. K. with that of Chelifer Geof., but if we go to examine the intermediate 

 forms, we will discover many connecting links. The serrula of the Hemictenodactyli 

 is never completely fused with the finger, but has always a longer or shorter por- 

 tion free distally; it is most often "narrower posteriorly than outside the middle" 

 (49. p. 231, and tab. V, figs. 7 and 10), and never distinctly broader posteriorly than 

 anteriorly (PI. I, figs. 1 d and 4 b). In the Chthoniinae Dad. the two distal thirds of 

 the serrula are completely free, as the figure of this organ of Chthoniiis terribilis 

 n. sp. shows (PI. I, fig. 1 d): its .structure is like a blade, which has the inner margin 

 dissolved into a number of squarely truncate teeth, as long as two thirds of the 

 breadth of the serrula itself; only the tip is long, slender and distinctly pointed. 

 The Obisiinae Dad. have only the distal third or half part free; the free portions 

 of the teeth are much shorter than in Chthonius C. K., because they are fused 

 basally, and the different parts of the serrula are not placed on the same level, as 

 at least the basal fourth is more or less curled over downwards. The teeth are 

 sometimes squarely truncate or rounded, and even enlarged distally as in 

 Blothrus spelaeiis Sch. and Roncus alpiims L. K., and sometimes pointed as in Obi- 

 sinm miiscorum Leach. (49. tab. V, fig. 10). The serrula of the Pseudobisiinae Hans, 

 provide most often a great similarity to that of the last mentioned subfamily, but 

 it differs to the extent, in which it is fused with the finger, having as a rule only 

 one fourth or fifth free f. inst. in Ideobisium crassimaniim Balz. (49. tab. V, fig. 7) 

 or in Ideoroncus Siamensis n. sp. (PI. I, fig. 4 b); Ideoronciis Mexicanus Bks. forms in 

 this respect an exception, for it has the distal third free (21, pi. IX, fig. 2 c). The 

 teeth are almost completely fused; they are most often rounded distally (PI. I, 



