594 MR. A, M. ALTSON ON THE 
tenth segment, and the three sets oE muscles associated with these paired rods 
are also intersegmental muscles. Tlie lateral sets following the course of the 
rods represent the muscles of the tenth sternite and tergite, whilst the median 
set represent those of the tenth and ninth sternite. 
The homology between the genitalia of the sexes seems apparent (text- 
figs. 3 & 4 and PI. 31. figs. 1 & 3).. The sensory-pitted imjointed lateral 
lobes homologize with the sensory-jiitted jointed vaginal palps ; the basal 
pieces correspond ; and the evaginated median lobe and extrusible internal 
sac homologize with the internal forked rods — " seitenstuck" — and invaginated 
uterus. The analogy of their functions is obvious. 
In the larva of L. hrunneus there are nine pairs of spiracles : one prothoracic 
and eight abdominal pairs. In the adult there are nine pairs of spiracles : 
one prothoracic, one metathoracic — on the soft integument below the wing- 
bases — and seven abdominal pairs. 
Summary. 
Both sexes in L. hrunneus are sexually mature when they have emerged 
through the wood from their pupal chambers. An external sex-character is 
described. 
In the male the reproductive organs consist of two testes of twelve 
pyriform testicular follicles of unequal size, six arising from each convoluted 
vas deferens, which terminate in a pair of jointed subcylindrical seminal 
vesicles. A short tube arises from each seminal vesicle, and forms the 
ejaculatory duct which empties into the oedeagus. Partly' superimposed .over 
the seminal vesicles and emf)tying into the short tubes are the paired 
accessory glands. They are subcylindrical, slightly tapering, and are curved 
around to underneath the ejaculatory duct. There is a pair of pygidial 
glands. 
In the female the reproductive organs consist of two ovaries, each com- 
posed of fourteen ovarian tubes with the nutritive cells situated at their 
apices. The ripe eggs accumulate in a calj^x which continues to form the 
oviduct. The oviducts terminate in a chitinized setse-lined paired valve 
which forms the source of the common oviduct. At this point the voluminous 
spermatheca arises ; it terminates in a tubular spermathecal or accessory 
gland. The common oviduct disappears into the invaginated double tubular 
"ovipositor" at a point in the metathorax, where the rectum also enters. 
In the testicular follicles the spermatozoa are in bundles, in the sperma- 
theca the}' are in packets or spermatophores. 
The " ovipositor '' has been found to consist of a double tubular prolongation 
of the ninth abdominal segment, with a reduced tenth segment towards the 
apex. When extruded the "ovipositor'" is approximately the length of 
the beetle. Situated at the apex of the " ovipositor " are the genitalia with 
the anus a short distance behind- 
