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 (PI. XLIV figs. IB and 13a). 



The median lobe is large and round, with the median orifice 

 across the dorsal aspect. The tegmen (fj/) 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 lateral lobes ; in the other 

 {Aidacocydus) 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 Trox mnacanthus, 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 Scao'ahaeus) cicatricosus Luc, 

 Spain. Eucranmm lacordairei, S. America. Phanaeus 

 lugens Nevinsou, Venezuela. Helioccpris mouhotus Sharp, 

 Malay penins, Gatharsius niolossus L., Asia trop. Ontho- 

 phagusfractieornis Pr., Brockenhurst. Oniticellus (Eadama) 

 marsyas 01. Madagascar. 



2. Aphodiinae. Apliodius inmctato-sulcatus St., Brocken- 

 hurst, and A. senegalensis Kl., Old Calabar. Millingenia 

 fossor Sharp, Ismailia. This latter not correctly classified. 



3. AcANTHOCERiNAE. Cloeotus sinuatus Bates, Guate- 

 mala, and C. rugiceps Germ., Rio de Janeiro, 



4. Orphninae, Orphmis sp. 



5. Hybosorinae, Hybosorus orientalis Westw., E. 

 India. Liparochrus timidus, Arrow, N. Australia. 



