14 



lias Ihe grealesl siniilarit)' lu that loiind in Obisiuiu CK., and in Idcobisiuiu crassima- 

 niim Balz. (49. tab. V, fig. 6 f) for inst., in which it consists of seven pinnate hairs. 

 In Ideoroncus pallidas Balz, for inst. we lind four hairs with the front margin more 

 or less branched (46. tav. XVII, fig. 23a, and pi. I, figs. 4a & 5a). In most other 

 species we have three hairs with or without ramifications for inst. in Ideoroncus 

 Mexicanus Bks. (21. pi. IX, fig. 2 b). The flagellum consists in many species of the 

 Garypidae Hans, of three more or less toothed hairs, as it may be observed in 

 most species of Olpiiim L. K. (46. tav. XVI, figs. 17—20; as well as 49. lab. V, fig. 3; 

 cf. pi. II, fig. 6 b); as well as in Garypus Floridensis Bks. (PI. II, fig. 4 b). In a few 

 species we find three simple hairs, which in Garypus saxicola Wath. are long, 

 slender and of equal length, while they are rather short and of unequal length in 

 Garypinus sp. from Funafuti (PI. II, fig. 5 a). In a few again we have four hairs 

 f. inst. in Garypinus sp. from Hawaii, in which the two anterior ones are toothed 

 and the two posterior ones almost simple (fig. 2, p. 17), as well as in Olpiuni Bir- 

 manicum n. sp. (PI. II, fig. 7 b) and Garypinus nobilis n. sp. (PI. II, fig. 8 b), in which 

 the longer front one is toothed, while the remaining three are simple and decrease 

 in length from front to back, thus providing great similarity to the structure in 

 Chelifer Geof. The most remarkable reduction in the shape of the flagellum within 

 this family and even the whole order is Ihal found in a group of species of 

 Garypus L. K., for in the.se it consists of a single, rather short, pointed hair (PI. II, 

 figs, lb & 3a); the species providing this interesting characteristic are for inst. 

 Garypus irrugatus Sim. The flagellum of Chelifer Geof. seems always to consist of 

 four or three hairs (cf. below) as may be observed in numerous figures in Balzan's 

 paper (46. tav. XIII— XV) as well as in this paper (PI. Ill, figs. 7 c & 8 c. pi. IV, 

 figs.*4a, 7 a, 10a). The foremost hair is almost always the longest and broadest, 

 and is more or less distinctly dentated or branched along the front margin (cf. pi. Ill, 

 fig. 7 c). The two or three hairs behind decrease in length as well as in breadth 

 from front lo back, and are almost always simple (cf. 46. tav. XIV, fig. 9 a). The 

 characters found in the structure of the flagellum within this genus are valuable, 

 but must be used critically on account of the variations, which several species 

 show in this respect. The flagellum of Pseudocbiridium Thorellii n. sp. consists of 

 two hairs, of which the anterior one bears three teeth, while the posterior only a 

 single one (PI. IV, fig. 12 b). The flagellum of Chiridium corticum Balz, consists 

 according to Balzan of four simple hairs (46. tav. XIII, fig. Ic), while that of 

 Chiridium muscorum Leach, consists of a very broad, almost triangular foremost 

 hair and two smaller ones behind. Before drawing definitive conclusions with 

 regard to the systematic value of the flagellum more facts seem to be necessary, 

 but itjis nevertheless evident, that families, genera or even species or more cor- 

 rectly^groups of species within certain limits are characterized by the development 

 of Iheir flagellum. It may also be noticed, that there is a certain simplification in 

 the number as well as in the ramifications of its hairs, if we go from the Hemi- 

 ctenodactyli to the Panctenodactyli, not gradual and not without exceptions, and 



