Anatomy of the Male Genital Tithe in Coleoptera. 553 



a chitinous rod {a) ; median orifice at apex. Tegmen forming a 

 sheath, chitinons above and membranous below. Internal sac 

 undifferentiated. 



It is impossible to place these with any satisfaction at 

 present. Tlie Melandryidae appear to be a family of 

 transition; or it may be an unnatural association. 



Family PYTHIDAE 



Forms examined : Pytho deprcssus L., Scotland. Bliin- 

 osimus rnficollis L., England. 

 Fig. 178 PI. LXX. 



P. depressus (PI. LXX fig. 178). 



Median lobe long, slender and tubular, with basal third slightly 

 enlarged. Tegmen forming large dorsal cap, as in Aerjialitklac, the 

 apical part being long, narrow and pointed at tip, the two lobes 

 long and slender; the basal-piece convex. Internal sac un- 

 difierentiated. 



lihinosimus ruficollis. 



Is of the same type ; the median lobe being membranous and 

 supported along each side by a chitin rod, the basal-piece is longer 

 than in P. depresses. This species in some points approaches nearer 

 to Aegialitidae. 



Family PYKOCHROIDAE. 



Pyrochroa pectinicornis L., Scotland. 

 Fig. 179 PI. LXX. 



Median lobe long, somewhat flattened, produced into two struts at 

 base (m.s), with median orifice on dorsal side near apex. Tegmen 

 consisting of consolidated lateral lobes (W) on ventral face, meeting 

 together on dorsal face at base, and a well-developed basal-piece. 

 Internal sac undifferentiated. 



The ventral aspect of the tegmen induces us to place 

 this and Trictcnotoma near together ; and we associate 

 them, as well as various other families of the " Heteromera," 

 with Cucujoidea. 



Family ANTHICIDAE. 



Form examined : Anthicus maritimais Lee , California 

 (named by Leconte with a query). 

 Ficr. 180 PL LXX. 



