550 Mr. D. Sharp and Mr. F. Muir on the Comparative 
lateral lobes are short, consolidated together along their dorsal 
margins, and form a triangular plate in the characteristic Tenebrionid 
fashion, 
Family RHYSOPAUSIDAE. 
Form examined: ? Rhysopaussus sp. (not in Brit. Mus.) 
Australia. 
Figs. 169, 169@ Pl. LX VIII. 
Tegmen of the Tenebrionid type. Lateral lobes consolidated along 
their dorsal edges, fornting 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: Omophius lepturoides Fabr., Rome. 
Prostenus dejeani Sol., Brazil. Chromomaea sp.? Australia. 
Figs. 170, 171 and 171la Pl. LXIX. 
Omophlus lepturoides (Pl. 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 (P1. LXIX figs. 171, 171a). 
A regular Tenebrionid type; the median lobe is reduced to a. 
mere membranous tongue on which the ejaculatory duct 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 (wide 
Biologia Centrali-Americana, Champion, Vol. IV. pt. 1 
pls. 17-20. On Pl. LX XVIII figs. 234 and 234a we have 
represented the abdominal structure of Cistela atra. 
