" Corona anah's " in Palpatores 23 



Fig. a. Phalangiuvi comv/um L., body of the female, excepting its posterior portion, from Vjelow ; 

 X 6. 



Fig. B. Phalanciium cornutum L., venti-al surface of cephalothorax, from below, xl2; only the 

 proximal parts of coxje are shown, mandibles omitted, maxillary lobe of the second pair of 

 coxse on the left side and operculum genitale removed. 



Fig. C GayrelJa minax Thor., body of the female, from the side, x 6 ; the upper half of cephalo- 

 thorax and of the major part of abdomen omitted. 



Fig. D. Gagrella mhmx Thor., body of the female, from below, x 6. 



Fig. E. Sclerosoma monoceros C. Koch, body of the male, from below; x 14. 



Fig. F. Anelasmocephalus lycosinus W. S., body of the male, from below, x 24. 



Fig. G. Anelttsniocephalus lycosinus W. S., posterior part of abdomen of the male, from below and 

 somewhat from behind, x 39 ; operculum anale is lifted up a little. 



Fig. H. Kemastoma lugubre O. F. Miiller, posterior part of abdomen of the female, from below 

 and somewhat from behind, x 20 ; operculum anale is lifted up a little. 



Fig. I. Troguhis rostraius Latr., middle portion of the ventral surface of cephalothorax, from 

 below, X 13; of the coxse only the proximal part is shown, mandibles are omitted and second 

 abdominal sternite with operculum genitale removed. 



Fig. el Bupares caper Thor., bodj' of the male, excepting the two anterior pairs of coxaj and 

 mandibles, from below ; x 1 2. 



is often divided into a large anterior and a small posterior part by a transverse more or less 

 distinct groove, these two parts are the eighth and the ninth sternites coalesced with each 

 other as in Cyphophthalmi. In this way the two families in question possess nine complete 

 segments, to which operculum anale must be added as the tenth segment. In Sclerosoma and 

 congeners the same elements can be traced as rudiments, with exception of the ninth ster- 

 nite ; in some species of Gagrella we found a transition stage to Phalangium and allied genera, 

 in which the ninth tergite and the eighth and ninth sternite have completely disappeared. 



Finally we may say some words on the structure of the posterior part of abdomen in the 

 family Ischyropsalidoidse. In Ischyropsalis C. L. Koch, the lateral pieces of " corona analis " are 

 always distinct, as indeed Thorell has already pointed out (a, p. 458). In most of the species 

 with which we are acquainted the median ventral piece is not developed, but is found in 

 /. dispar E. S. in the shape of a rather narrow and short, chitinized strip extending between 

 the two lateral pieces. In /. MiXlleri there is a piece behind the seventh sternite which 

 reaches laterally as far as the latter ; the middle portion of it, in front of operculum anale, 

 is quite short, but on either side of operculum anale it shows a considerable expansion back- 

 wards ; the extreme lateral portion is again quite short. We are of the opinion that this 

 piece behind the seventh sternite corresponds to the three pieces of "corona analis," in other 

 words, that this piece is formed by the fusion of the ninth tergite with the eighth sternite, 

 from the latter of which a ninth sternite is not marked off We may remind the reader that 

 a rather similar fusion of the same parts is found in Ogovia n. gen. and Siro Latr. of the 



