200 Prof. J. C. Schiddte on the Classification 
tion between small intestine, large intestine, and rectum. But 
in Cebrio it is slightly winding, with powerful transverse muscles, 
the posterior half distended so as to form first a colon of con- 
siderable dimensions, in its posterior part furnished with many 
small ceeca, and finally a short rectum, markedly separated 
from the former, and with powerful longitudinal muscles. 
There are four rather short (in Throscus very short and thick) 
Malpighian vessels, of which the ends are closed and quite free, 
although each pair is closely held together by minute trachez. 
They consequently do not form two loops such as are represented 
by Léon Dufour (Ann. d. Se. Nat. 1824, i. pl. 2. figs. 3, 4). 
Each of the testes consists of a bundle or tassel of shorter or 
longer folliculi, which are closely united by intertwined trachez 
and imbedded in fat, but not enclosed in a common bag. The 
testes are situated in the anterior portion of the abdominal 
cavity, close to the back, over the digestive tube, which runs 
elose under them through the ring which is formed by the vasa 
deferentia. The number of follicles in each testis is very variable: 
in Adrastus limbatus there is only one, in Cryptohypnus quadri- 
pustulatus nine, im Lacon murinus more than twenty ; but within 
the natural groups their number seems to depend principally on 
the size of the animals, so that it is upon the whole greater in 
the larger species and less in the smaller ones. Thus, whilst 
Diacanthus eneus has fifty, D. tessellatus forty, and Agriotes lineatus 
and obscurus fifty, Agriotes sputator has only twenty-four, Am- 
pedus balteatus twenty, Limonius minutus nine to eleven ; again, 
Athous niger has seventy, A. ruficaudis forty, and A. subfuscus 
twenty. All these numbers are approximate, as in each species 
the number vacillates between certain limits. In Ceb;7o the testes 
are distinguished by their extraordinary length and slenderness ; 
they consist of more than 100 follicles placed on short stems in 
longitudinal rows, round the thin vas deferens, which occupies 
the middle. 
The vasa deferentia are long, closely wound, and first extend 
a considerable way backward, passing the vesiculz seminales, 
whereupon they bend forward again to the point where they 
join the ductus ejaculatorius. Near the testes they are slender, 
but increase by degrees in thickness, without, however, usually 
assuming very remarkable dimensions, except in species where 
they are very short (as in Cryptohypnus quadripustulatus, Limo- 
nius minutus, Campylus linearis) ; in species where they are very 
long they do not become very stout (as in Ampedus sanguineus, 
where they reach about 11°4 millims., in Diacanthus eneus, 
where they attain 19:2 millims., in Athous ruficaudis, where the 
length is about 11 millims.). In some species (for instance, 
Agriotes aterrimus, Diacanthus tessellatus, Athous niger, but not 
