sexual character of value is found in the galea of the antennae. 
The same author contributed again already next year largely to 
our knowledge of these organs (1891, 18). Hansen gives in his most 
valuable paper (1894, 19, pp. 215—217, pp. 219—220 and pp. 227 
—229) excellent drawings as well as descriptions of the antennae 
in å good many genera, and bases his system principally on cha- 
racters taken from these organs. His severe criticism of Stecker's 
mysterious '"Geruchsorgane” is well worth reading (p. 215); a question 
he already touched in his earlier paper (10, p. 525). 
The next author, who deals with these organs is Daday (1897, 
20), who has given figures of several forms from New-Guinea. The 
shape of the serrulae exteriores is not correct, for his figures (tab. 
XI, 5 and 17), which show these structures of Chelifer megasoma 
Dad., represent the serrulae free distally; his drawing of lamina 
interior of Chelifer Geof. is fairly correct. His representations of 
the flagellum in Ideobisium bipectinatum Dad. and Chthonius Wlas- 
sicsi Dad. are remarkable on account of the circumstance, that their 
hairs have common stems. The flagellum of the former (tab. XI, 
fig. 7) is in this respect dissimilar to that found in all other species, 
in which this structure is known. The flagellum of his Chthonius 
C.K. (fig. 1) is very similar to that of Cht. terribilis un. sp. (cf. 29, 
pl. I, fig. 10); the similarity is most striking, when the antenna of 
the latter is seen from beneath without dissection; its hairs seem 
to rise from a common stalk. If the hairs of the two flagella should 
turn out to be correctly described by Daday, there is a slight 
foundation for Stecker's ''Geruchsorgane” and we have in either 
case traced the original foundation of this remarkable structure. 
Descriptions of the antennae in different species have in the 
last few years been published by Tullgren (1900, 21—22; 1901, 23, 
p. 101; 1906, 27; 1907, 33—34) and by the present author (1905, 
26) as weli as by Ellingsen (1901, 24, p. 88 and 1906, 28, tav. IV). 
In a paper (1906, 29, pp. 10—24), of which this historical survey 
originally formed part, the present author has collected all available 
old facts as well as new ones, and hopes in a near future to get 
