47 



towards ils base, which is the portion connected with the coxa at its interior- 

 posterior corner, is divided into two parts ol" verj' unequal size (PI. II, fig. 9 a, fe-rf); 

 the basal portion (b), that near to the interior margin of the coxa, is only one 

 third or one fourth as spacious as the distal part (d). These two parts are 

 anteriorly separated from each other by a deep cleft (n), which is continued into 

 two rather shallow depressions on the dorsal and ventral surface, gradually dis- 

 appearing towards the posterior margins. This cleft is towards the base well limited 

 by a thick chitinous ridge continued dorsally and ventrally near to the posterior 

 margins as the limitation of the afore mentioned shallow depressions there (PI. II, 

 figs. 9b-c); the distal limitation of these depressions is also fairly well chitinized, 

 but not so the distal or exterior margin of the anterior cleft; this appears thinly 

 chitinized and is directed inwards and backwards beneath the margin of the basal 

 sac and is here fused with its wall. 



The two cavities of the sac blend into each other posteriorly without any 

 limitations, but not so anteriorly; the two portions are here separated from each 

 other in a rather curious manner. Where the walls of the two cavities blend into 

 each other anteriorly, a kind of short funnel-shaped gutter (f) takes its origin; this 

 gutter (fig. 9 c, h-) is broad distally where it is partly fastened, narrower basally, 

 where it passes into tlie basal (interior) cavity, and open towards the posterior 

 surface of the sac; the posterior free margins of this gutter are thickened and bent 

 towards each other (fig. 9 c). This funnel-shaped organ is divided by longitudinal 

 lines just, as if it had been built of fused tubercles or cones; it is at least termin- 

 ally mounted with hairs (h^), fairly long, slender and pointed, which converge 

 towards each other and are directed through the round entrance opening (o), by 

 which the coxal sac communicates with the external world; these hairs, which 

 are often bifurcate terminally, form together a gutter open posteriori}' and blending 

 into the one, already described, the appearance of which to a funnel, open 

 posteriori}', becomes consequently more complete. The units, by which the wider 

 portion of this funnel are built up, are not all fastened behind, at least a few are 

 free and extend into the distal cavit}'; the more minute structures of these parts 

 I was not able to investigate. It is thus evident that the two portions of the coxal 

 sac communicate with each other only posteriorly, but are well separated from 

 each other anteriorly. 



The anterior and partly the exterior surface of the distal part is beset with 

 subconical, longer and shorter tubercles (about 20), which are directed towards the 

 interior and the base of the .sac; these tubercles, which are placed nearly to each 

 other or more apart, are sometimes supported by chitinous ridges (r) and alwaj's 

 mounted with a single or seldom two long slender hairs, projecting into the lumen 

 of the cavity in the same direction as the tubercle itself. The tubercles are pro- 

 bably hollow, but no trace of nerves was seen (figs. 9 a-b, /i). 



2. Ch. depressus C. K. (PI. II, fig. 10 a). — The sac of this species is in the 

 principal points of its structure similar to that of the preceding one, hut is never- 



