580 Mr. D. Sharp and Mr. F. Muir on the Comparative 
side and the basal-piece forms a small sclerite placed ventrally, 
being membranous on the dorsal aspect. Internal sac about twice 
as long as the aedeagus, covered with fine light spines. 
Aulacocyclus edentulus (Pl. XLIV figs. 13 and 13a). 
The median lobe is large and round, with the median orifice 
across the dorsal aspect. The tegmen (fq) forms a chitinous tube, 
narrower at the base than at the apex. The internal sac is a little 
longer than the aedeagus, the apex studded with light brown short 
hairs. 
The forms that we have examined divide into two 
distinct groups, in one the tegmen consists of two distinct 
pieces, the basal-piece and the Jateral lobes ; in the other 
(Aulacocyclus) the basal-piece and the lateral lobes form 
one piece, either by consolidation or the suppression of 
the basal-piece. It is possible that this family is an off- 
shoot of such a form of aedeagus as 7rox omacanthus, but 
still more probable that it came from some form annectant 
with Trogidae and Dynastidae. 
Family SCARABAEIDAE. 
Forms examined: We have examined somewhat less 
than 100 forms of this enormous family of Coleoptera. 
Mr. G. J. Arrow has been so good as to suggest an arrange- 
ment of those that call for notice that will be convenient, 
and in accordance with his views (which, as he states, are 
to some extent conventional); and we place them under 
fourteen divisions, as follows :— 
1. CoPRINAE. Ateuchus (or Scarabaeus) cicatricosus Lue., 
Spain. Hucranium lacordairei, S. America. Phanaeus 
lugens Nevinson, Venezuela. Heliocopris mowhotus Sharp, 
Malay penins. Catharsius molossus L., Asia trop. Ontho- 
phagus fracticornis Pr., Brockenhurst. Oniticellus (Radama) 
marsyas Ol. Madagascar. 
2. APHODIINAE. Aphodius punctato-sulcatus St., Brocken- 
hurst, and A. senegalensis K1., Old Calabar. Muillingenia 
jossor Sharp, Ismailia. This latter not correctly classified. 
3. ACANTHOCERINAE. Clocotus sinuatus Bates, Guate- 
mala, and C. rugiceps Germ., Rio de Janeiro. 
4. ORPHNINAE. Orphnus sp. 
5. HYBoSORINAE. Hybosorus orientalis Westw., E. 
India. Liparochrus timidus, Arrow, N. Australia. 
