234 ENTOMOLOGISK TIDSKRIFT 1897. 
we have been able to count the number — eight long slightly 
curved hairs; in the hindmost terminal ring sixteen much shor- 
ter, thinner and less curved ones. 
, 
We have not observed any external character indicating dif 
ference of sex. The specimens we have examined more closely 
were all temales. 
That ze have not been able to discover tracheæ in Koe- 
nenia is a fact to which we do not attribute much importance, 
as. we have only examined specimens preserved in spirit. But as 
the animals studied by Grassi were fresh ones in which such an 
excellent investigator could scarcely have overlooked these or- 
gans, it may be considered as an ascertained fact that Koenenza 
lacks special organs of respiration. 
Of the internal organs we have not undertaken any exami- 
nation properly speaking, as, without a much larger material, we 
should not have been able to advance much further than they 
results obtained by Grassi, though these are not considerable 
either. Still we wish to make a few short remarks which we 
think there is good reason for setting forth. In the second ab- 
dominal segment there is an organ (rs) whose outlines are drawn 
in fig. 2; it shows the same peculiar lustre and refraction of 
light which one of us knows so well from the receptaculum se- 
minis of small Crustacea. 
Grassi mentions (p. 161, fig. 13) that he has found a pair- 
ed long tubular gland, »tapezzata d’un semplice strato di cellule 
epiteliali» which extends through a large part of the »cephalo- 
thorax», and which »perhaps» has its orifice in front of the third 
pair of limbs. In his explanation to his table (p. 171) GRASSI 
expresses the opinion that this gland corresponds to the one 
which generally, though incorrectly, is called the Krohnian gland", 
17 That this organ is a pouch-like gland, was already ascertained by 
Kroun (Arch. f. Naturgeshichte, 1867, I, pp. 79--83) with regard to Ofr- 
liones Palpatores. That in Ofiliones Laniatores it is a stink-gland, one of us 
(WILLIAM SORENSEN) was fortunate enough to make out in 1879. But much 
earlier still P. GERVAIS was aware of this fact (in Gay, C.: Historia fisica y 
12 
