550 Mr, D. Sharp and Mr. F. Muir on the Comjmrative 



lateral lobes are short, consolidated together along their dorsal 

 margins, and form a triangular j^late in the characteristic Tenebrionid 

 fashion. 



Family RHYSOPAUSIDAE. 



Form examined : ? Bhysopaussus sp. (not in Brit. Mus.) 

 Australia. 



Figs. 169, IGda PI. LXVIII. 



Tegmen of the Tenebrionid type. Lateral lobes consolidated along 

 their dorsal edges, forming a triangular plate on the dorsal face with 

 the lateral edges turned under. Basal-piece large, forming a large 

 curved sclerite on the dorsal face, membranous on the ventral face. 

 The median lobe is reduced to a mere small membrane on which 

 the ejaculatory duct opens. 



Family CISTELIDAE (Alleculidae of some). 



Forms examined : Omophlus lepturoides Fabr., Rome. 

 Prostenus dejcani Sol, Brazil. Chromomaca sp. ? Australia. 

 Figs. 170, 171 and 171« PI. LXIX. 



O^nophlus leptnroides (PI. LXIX fig. 170). 



This aedeagus is of the Tenebrionid type. Lateral lobes very 

 small, consolidated into a small dorsal plate, pointed at tip and 

 curved. Basal-piece very long and narrow, enlarged at base, 

 chitinous on dorsal and membranous on ventral faces. Median 

 lobe reduced to a small membrane on which the ejaculatory duct 

 opens, at ventral edge there is a small two-toothed chitinous lobe 

 with two long struts (a). Internal sac larger than the ejaculatory 

 duct, but not highly differentiated. 



Prostenus dejeani (PI. LXIX figs. 171, 1710). 



A regular Tenebrionid tyjje ; the median lobe is reduced to a 

 mere membranous tongue on which the ejaculatory di\ct opens. 



Chromomaea sp. 



Is of the Tenebrionid type. Lateral lobes" small consolidated into 

 a small dorsal plate, expanded at tip, and beset with small spines 

 pointing basally. Basal-piece long and curved. Median lobe very 

 small. 



In many members of this family the terminal body 

 segments are highly modified to form claspers (vide 

 Biologia Centrali-Americana, Champion, Vol. IV. pt. 1 

 pis. 17-20. On PI. LXXVIII figs. 234 and 234a we have 

 represented the abdominal structure of Cistela atra. 



