554 Mr. D. Sharp and Mr. F. Muir on the Comparative 



A. maritimus (PI. LXX fig. 180). 



Median lobe short, tubular, continued from the dorsal basal part 

 as a single broad strut (ms) ; median orifice at apex, the chitin- 

 isation on the dorsal face (6) continuing on to the sac, ventral edge 

 of orifice projecting beyond dorsal. Tegmen forming a large cap- 

 piece pointed at apex with the basal lateral edges turned in to 

 form a groove in which the median lobe plays ; from the base 

 proceed a pair of divergent struts (c), consolidated at their bases. 

 Internal sac undifferentiated. 



The cap-piece without lobes and the undifferentiated 

 internal sac induce us to place this also in Cucujoidea. 

 The tegmen is however of peculiar form. 



Family OEDEMERIDAE. 



Forms examined : Onconicra fcuwrata Fabr., England. 

 Cojjidita (Scssinia) i^unrtuiii Macl., Australia. Dohrnia 

 miranda Newm., Australia. 



Figs. 181, 182 and 183, PI. LXX. 



Onconicra fcmorata (PI. LXX fig. 181), 



Median lobe long, pointed and flattened laterally, bent up at the 

 base, where the dorsal and ventral edges of the median foramen 

 project, the ventral one being flattened out and .serving for the 

 attachment of muscles ; median orifice on ventral face near tip ; on 

 each side near tip there is a stout, sharp spine. Tegmen consisting 

 of a plate coming to two points at the distal end, and T-shape at 

 base, the arms of the T curving up and embracing the median lobe ; 

 the first connecting membrane attaching the median lobe to the T- 

 sliape piece of tegmen. Internal sac undiff'erentiated. 



CopicHta pundum (PI. LXX fig. 182). 



This is on the same plan as Oncume)-a, but the tegmen is round at 

 the apex with a slight indentation at its tip and two small recurved 

 spines a little before the tip, on the dorsal aspect. 



Dohrnia miranda (PI, LXX fig. 183). 



Median lobe flattened laterally and pointed at apex, the median 

 orifice being situate on the ventral aspect far from the apex 

 Tegmen forming a large sheath, membranous or ventral (?) aspect 

 and chitinous on dorsal (?). Internal sac undiff'erentiated. The 

 position of the tegmen on the dorsal side of the median lobe does 

 not agree with other Oedemeridae we have examined ; but this 

 requires more detailed investigation. 



