GENITAL SYSTEM OF LYCTUS BRtlNNEUS. 593 
Text-fig. 4 depicts the ventral and dorsal aspects of the apex o£ the abdomen 
of three pupse. From these it is apparent that the external appendages of 
the genitalia in both sexes arise from a similar position, i. e. on the ninth 
sternite (IX) -and towards the tenth; the gonopore (yo) lies median ly between 
these appendages, and is situated on the ninth sternite. 
In the female L. hrunneus the last visible sternite — the fifth of sjstematists — ■ 
is the true seventh sternite (VII) and corresponds with the seventh tergite (7) 
directly above it (PI. 33. figs. 1 & 3). The pygidium represents part of the 
eighth segment with the cloacal stalk [Ir) an invagination of the eighth 
sternite (VIII), and the paired rods (i-?-) are lateral invaginations of the 
eighth tergite (8). This conclusion is supported by the presence of the mi 
and m^ series of muscles (PI. 32. fig. 1), which would seem to be modified 
intersegmental muscles. For the position of attachment of the m^ set is from 
the apex of the cloacal stalk to lateral positions near the beginning of the 
ninth segment — the basal portion of the " ovipositor " ; whilst the m" set, 
which envelop the clo.'ical stalk, arise from the point of its invagination. 
Moreover, a part of the muscles enveloping the paired rods {sr, PI. 32. fig. 1) 
are attached laterally to the base of the ninth segment, whilst the remainder 
of these muscles are attached to the point of invagination of each rod. 
The "ovipositor" is, therefore, a double tubular prolongation of the ninth 
segment, tergites and sternites being indistinguishable. Whether the trans- 
parent and setse-less basal portion of the "ovipositor" represents a pro- 
longation of the "soft membrane" between segments 8 and 9, is not 
manifest. Intersegmental membrane is not 'manifest anywhere else. And, 
conversely, with regard to the setae-covered distal portion of the " ovipositor," 
setae are not manifest on any tergite but the seventh. 
The apex of the ovipositor bears the anus dorsally between the fused and 
reduced tenth tergite and sternite, and it carries the genitalia on the ninth 
sternite beyond the anus. 
In the male (PI. 31. figs. 2 & 3) the last visible sternite is the seventh, as 
in the female : and likewise the pygidium represents the eighth segment 
The ninth tergite and sternite are not solidly chitinized, and are invaginated 
and fused at their beginning to form the lumen enclosing the oedeagus and 
the anus, the latter being enveloped in a tube (ev, fig. 3) formed by the 
fused tenth tergite and sternite, as in the female. The invaginated nintli 
segment, the sternal portion of which is invaginated more than the tergal 
portion, shortly evaginates. Then the tergal portion joins the tergal portion 
of the tube [ev (10), fig. 3] ; whilst the sternal portion, in which the gonopore 
is situated medianly, eventually joins the sternal portion of the tube (X, 
fio-. 2). The ninth sternite is })roIonged around the gonopore to form the 
extrusible membranous tube carrying the oedeagus, to which it is attached, as 
previously stated, around the basal piece. The paired rods (vr, figs. 1 & 3) 
that project into tlie abdomen from the tube (ev) are invaginations of the 
