124 



plate; inside only two hairs are found on each side. The complicated system of 

 inner sexual organs bears great similarity to that of the preceding species, as they 

 were described by Croneberg. 



4. Ch. Birmaniciis Tlior. (PI. Ill, fig. 10 a). The anterior genital plate is broad 

 as well as long, but very indistinctly marked off laterally and in front; a distinct 

 marginal membrane is found, distinctly convex behind, but not distinguished 

 distinctly from the anterior portion (fig. 10 a), which is gradually raised in the 

 middle and provided with three hairs on each side. The inner copulatory organs 

 are partly visible through the skin and contribute to the characteristics of the 

 anterior plate, even seen from below; on each side near the middle a large, plate- 

 shaped, chitinized body is seen, to which muscles are fastened, and between these 

 two black spots, which really are the tips of a styli-formed organ (fig. 10 a, c, 

 the above mentioned spots not drawn). The hindmost genital plate (p) has in the 

 middle two transverse and concave rather short sclerites; the former of these {b') 

 is a mere line in the middle, where it has a fairly long marginal membrane, which 

 as well as the lateral longer parts of this sclerite is overlapped by the anterior 

 plate. The latter of these two sclerites (b-) has a similar shape, being like the 

 former shorter in the middle and enlarged towards ends, but is more narrow and 

 is only one third as broad as the whole sternite; this sclerite is connected by and 

 marked oil' from the first sclerite by an articulate-membrane of its own length. 

 This sclerite is in similarity to the first curved distinctly backwards in the middle, 

 overlaps the anterior portion of the fourth sternite (s*), when in natural position, 

 and it merges gradually into the other portion of the integuments laterally. The 

 first tergite bears apparently hairs neither outside nor inside, while the second 

 bear four pointed hairs on each side near to the middle. The inner sexual organs 

 of this species seem to difier to a considerable degree from those of the already 

 mentioned forms; accessory club-shaped glands, similar to those of Ch. graniilatus 

 C. K. are found in considerable number. The genital area of a great number of 

 species, which are nearly related to Ch. Birmanicus Thor., is similar to that described 

 here as far as can be judged from the outer appearance only, without dissection. 



III. Claws. 



As far as the peculiarities in the armature of the claws in Ch. quadrimaculatns 

 Tom. and Ch. peculiaris L. K. are concerned, I refer to p. 43. The claws of Ecto- 

 ceras Steck., but especially those of "Lophochernes Sim.", are in a number of species 

 provided with anterior teeth, which show marked specific as well as sexual varia- 

 tions, and which ditTer in a high degree from each other in the claws of the first 

 and the fourth pair of legs (cf. pp. 43 — 44). The tarsi of the fourth pair of legs bear 

 in Ch. depressus C. K. claws, which are always provided with an anterior tooth 

 arising near to the distal third and about half as long as the tip proper or even 

 longer; the claws of the first pair of legs bear in the female anterior teeth com- 

 paratively bigger than those of the fourth pair, but in the male the two claws are 



