600 Mr. D. Sharp and Mr. F. Muir on the Comparative 
base on dorsal and ventral side. Basal-piece slightly shorter than 
lateral lobes. 
The specimen at our disposal is greatly destroyed by Anthrenus. 
The elongation of the lateral lobes is remarkable. Burmeister 
considered this form to be related to Huchirus, and there appears to 
be a great similarity in the aedeagus of the two, but we cannot say 
to what extent this is true of anything but the hard sclerites. The 
general shape of the aedeagus is one that is frequent in the Melolon- 
thine series of genera. 
Obs.—The aedeagus of Scarabaeidae is readily recog- 
nised (if Trogidae, Lucanidae and Passalidae are excluded) 
by the following definitions :— 
Tegmen greatly developed, the basal-piece enormous, 
consisting of an anterior part unchitinised beneath, and a 
more distal tubular part to which are attached apically 
the varied lateral lobes (frequently called forceps or para- 
meres); the median lobe drawn within the basal-piece, 
and thus concealed, membranous except at the extreme 
base where there are, more or less well developed, elastic 
chitinous supports; sac large, frequently provided with 
remarkable, varied chitinous structures. 
The perfection attained varies greatly. There are 
higher and lower forms in each of the great divisions. 
The number of forms examined is not sufficient to enable 
us to follow up this remark profitably. 
MORPHOLOGY. 
B. GENERAL. 
A BRIEF statement of the anatomical terms we have 
used will be found in the early portion of the Memoir 
(Orismology, p. 481). The term genital tube is used 
because it conveys the idea of the chief characteristic of 
the parts. Whatever else they may be, however different 
they may appear, their combination to form a perfect 
tube without orifices, is remarkable: the one “orifice” 
that exists is not a real one. It arises from the invagina- 
tion of the tube into itself. The genital tube is therefore 
a doubled tube, one end of which is a continuation of the 
body wall, while the other divides into a fork, of which one 
