PARKER: NEW EXGLANl) SARCOl'lIACilDAE. 17 
the uhdomen proper (PI. (i, fig. 40). This corresponds to their original, 
not their specialized condition, that is, the actual dorsal and ventral 
parts are in their true relation. Thus the forceps are seen to he home 
at the junction of the posterior and anterior surfaces of the eighth 
segnient rather than on the apparent ventral surface as they appear 
when the segments are folded forward. References made in the 
descriptions to parts of the genital segments or genitalia follow this 
same plan. 
The highly specialized genital structure (protuberance genital, 
Villeneuve; Genitalsegmente, Bottcher, equalling seventh and eighth 
segments; hypopygium; anal segments) which is now fully exposed, 
consists of three segments: the sixth, seventh, and eighth abdominal 
(PI. 6, fig. 40). In descriptions the seventh will he referred to as 
the first genital segment, the eighth as the second. 
The fifth ventral plate (PI. 5, fig. 30; PI. 6, figs. 37, 40, vp.^; callerl 
fourth in the descriptions of this paper) consists of a short basal 
portion, usually concealed beneath the fourth and bears two latero- 
posterior extensions, the lamellae (Lamellen, Bottcher; PI. 5, fig. 30; 
PI. 6, fig. 37, /.). Their inner anterior edges are united by membrane. 
In this species they are normally approximated along the mid^■entral 
line of the body. The inner portion of each is slightly ridged longi- 
tudinally and each ridge bears short, stubby, close set bristles, that in 
their entirety resemble in general appearance a scrubbing brush and 
suggest the term ' brushes ' (Biirste, Bottcher) which will be used in 
descriptions (PI. 6, figs. 37, 40, bvp. IV). The lamellae can be spread 
apart and thus permit the passage of the penis between them. 
A tough membrane (PI. 6, fig. 40, cm.) connects the genital segments 
with the abdomen proper and permits protrusile and retractile move- 
ments. Ventrally between the fifth plate and seventh segment it is 
very full, forming a pocket (PI. 6, fig. 37, ^j/r.) beneath the former for 
the reception of the penis when at rest. Lying in this connecting 
membrane, but not visible from al)ove, is the vestige of the sixth 
segment (PI. 5, fig. 32, as.^). If the designations of Pandelle and 
Bottcher are correct the true fifth plate has disappeared, and in its 
place is found a part, at least, of the highly modified sixth segment. 
However, careful examination of a specimen of which the genital 
segments have been drawni out to their full extent exposing the entire 
connecting membrane, shows embedded in the latter a chitinous arch. 
As the specimen is held ventral side up, head forward, this arch is seen 
