Anatomy of the Maie Genital Tube in Coleoptera. 558 
a chitinous rod (a); median orifice at apex. Tegmen forming a 
sheath, chitinous above and membranous below. Internal sac 
undifferentiated. 
It is impossible to place these with any satisfaction at 
present. The Melandryidae appear to be a family of 
transition; or it may be an unnatural association. 
Family PYTHIDAE 
Forms examined: Pytho depressus L., Scotland. Rhin- 
osimus riuficollis L., England. 
Fig. 178 Pl. LXX. 
P. depressus (Pl. LXX fig. 178). 
Median lobe long, slender and tubular, with basal third slightly 
enlarged. Tegmen forming large dorsal cap, as in Aegialitidae, the 
apical part being long, narrow and pointed at tip, the two lobes 
long and slender; the basal-piece convex. Internal sac un- 
differentiated. 
Lhinosimus ruficollas, 
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. depressus. This species in some points approaches nearer 
to Aegialitidae. 
Family PYROCHROIDAE. 
Pyrochroa pectinicornis L., Scotland. 
Fig. 179 Pl. LXX. 
Median lobe long, somewhat flattened, produced into two struts at 
base (ms), with median orifice on dorsal side near apex. Tegmen 
eonsisting of consolidated lateral lobes (ll) 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 TZ'rictenotoma near together; and we associate 
them, as well as various other families of the “ Heteromera,” 
with Cucujoidea. 
Family ANTHICIDAE. 
Form examined: Anthicus maritimus Lec, California 
(named by Leconte with a query). 
Fig. 180 Pl, LXX. 
