123 



articulated in deep hat-shaped cavities. On each side of this apparatus a ram's- 

 horn-shaped body is found lying in a fairly deep cavity, and connected with this 

 as well as with the posterior plate by a system of chilinous membranes; when 

 this organ is protruded, it will pass the margin of the anterior plate, the lateral 

 concavity of which is well fitted to receive them; the anterior plate will probably 

 by this pressure be forced forwards, as it is very movable on account of the thinly 

 skinned anterior surface, which will act as an articulate membrane. 



The genital organs show Ln all species of '^Lophochernes Sim." an almost 

 identical structure; only Ch. sciilpturatus Lew., of those examined by me, is diffe- 

 rent from that already described by the shape of the posterior plate and by the 

 transverse line along the hindmost margin, marking this olf from the rest (21. 

 pi. VIII, fig. 2 b, g). 



3. Ch. ciinicoides F. — Croneberg has (45. pp. 450 — 456) given a valuable 

 description of the inner male-apparatus of this species, but his description of the 

 genital ])late is very imperfect (taf. XI a, fig. 1); Stschelkanovtzetf has later on dealt 

 with the same theme, but only very briefly, and found that the sexual opening is 

 a transverse split, not a longitudinal one as stated by Croneberg (67. p. 327, fig. 2). 

 The anterior plate is long and broad, much longer than the posterior one, and 

 broader than long; it is provided with a great number of long, pointed, simple, 

 slightly curved hairs, which converge towards the median line; the hindmost 

 marginal portion of this plate is marked oft' from the foremost bigger one by a 

 transverse line; this marginal part is wanting in the middle, but is substituted for 

 by a marginal membrane, longitudinally striped and without hairs, and continued 

 as a mere marginal seam laterally; the whole plate appears concave in the middle 

 behind at the first glance. The posterior shorter plate is provided with a well 

 developed marginal membrane, which is much longer in the middle than laterally 

 and here moderately convex; this plate bears a number of hairs apparently placed 

 without proper order, and its anterior portion gradually merges into the base of 

 the lamina, which has densely placed longitudinal lines. Inside under this mar- 

 ginal membrane and at the base of it, seven hairs are articulated in deep cavities 

 on each side of the chitinous apparatus, through which the accessory glands dis- 

 charge; this structure bears similarity to that of Ch. graniilatus C. K., but the glands 

 are quite difterently developed (cf. 45. taf. XI a, lig. 38, s). The transverse genital 

 opening is situated between these two plates. 



The structure of this organ is in Ch. nodosiis Schranck only slightly different 

 from that found in the preceding species. The anterior plate is distinctly shorter, 

 provided with comparatively few hairs. Behind the distinct transverse line, which 

 is at least in this species placed inside, we find only a clear marginal membrane, 

 which is broadest in the middle and laterally bears a few hairs. The posterior 

 plate is short and has the hindmost portion slightly raised and provided with a 

 transverse row of hairs; the anterior portion slopes towards the front, where a 

 broad marginal membrane is found, which is overlapped by that of the anterior 



16- 



