of Buprestide and Elateride. 201 
A. ruficaudis) a short lateral branch starts from the point where 
they bend forwards again. In Cedrio the vasa deferentia, though 
very long, are towards their lower extremity suddenly extended 
into a long winding folliculus, of which the circumference is 
five or six times that of the thin part. 
The ductus ejaculatorius is short, thick, and clumsy ; it re- 
ceives at the top, besides the vasa deferentia, three pairs of 
glandular vesicles. 
The first pair of these, which are more properly described as 
vesiculz seminales (spermatophorous glands), vary considerably 
in size and shape, though they form generally the most conspi- 
cuous parts of the interior sexual organs of the male. In 
Diacanthus pectinicornis they are fusiform, unusually small, 
1-2 millim. long, whilst the ductus ejaculatorius in this species 
is particularly thick, club-shaped, and about 3-6 millims. long. 
In Athous niger, ruficaudis, and subfuscus they are, on the contrary, 
very large bags, of oval, on the inside somewhat concave form ; 
in Adrastus limbatus and Diacanthus tessellatus the shape of the 
bag is still more arched and the imner anterior angles some- 
what produced; in Limonius minutus and Diacanthus bipustu- 
latus the curvature increases, and in the last-mentioned species 
the anterior angles are likewise produced ; this protraction of 
the angles is further increased in another series of species, 
and the angles are variously wound, as in Cryptohypnus quadri- 
pustulatus, Agriotes aterrimus and mar ginatus, and Ampedus 
balteatus ; in Lacon murinus the anterior angles are even divided 
each into two unequal branches, which are wound in spirals each 
in its own direction; in Agriotes obscurus, finally, the vesicule 
seminales have the shape of a stout, arched and winding tube, to- 
wards the end spiral, with a short, thick lateral branch, whilst 
in Agriotes lineatus they differ by being wound in double spirals 
at their end. In Cebrio these organs are slender, not stouter 
than the extended part of the vas deferens, with arched and 
spirally wound ends. But with regard to all these varieties 
of form, it must be observed that they embrace only the outer 
forms of the vesicule seminales, whilst the inner membrane is 
quite independent and does not by any means follow the external 
outline of the organ. This inner membrane forms a compli- 
cated system of cavities and expansions communicating with one 
another. In Cryptohypnus quadripustulatus its anterior part 
terminates in two long, extremely fine tubes, which accompany 
the anterior winding part of the vesicula. In Agriotes obscurus 
it forms a long tube with various dilatations, and is accompanied 
by a darker band, of alternating width, and of which the lighter 
parts show themselves to be composed of perpendicular cellular 
glands. The tube enters into the above-mentioned thick lateral 
