Anatomy of the Male Genital Tube in Coleoptera. 529 
the head of A. setifer and <A. wollastoni differ. The 
presence of wings in Aglycyderus but not in Proterhinus is 
the only distinct difference we can point to at present. 
Family MYCETOPHAGIDAE. 
Form examined: Mycetophagus quadripustulatus L., 
England. 
Hig T10. Pl UX: 
M. 4-pustulatus (Pl. LX fig. 110). 
Median lobe large, flattened and pointed at tip, the basal angles 
being prolonged into a pair of median struts, median orifice at tip 
on ventral face. Lateral lobes large, flattened, enveloping the basal 
part of median lobe. Basal-piece large, chitinous on ventral face, 
membranous on dorsal. Internal sac undifferentiated. 
Apparently a trilobe form with mobile median lobe. Cf. 
Dermestidae, and Thymalus in Trogositidae. 
Family DERMESTIDAE. 
Forms examined: Dermestes murinus L., England. 
Anthrenus claviger Er., England. 
Fig. 121 Pl. LXII. 
D. murinus (Pl. LXIT fig. 121). 
A modified trilobe form, with long, slender median and lateral 
lobes, the median orifice near tip on ventral face, and the median 
foramen at base, where the edge is extended on each side into a 
short median strut (ms); the point of articulation is on the dorsal 
aspect. Basal-piece small, and fitting over the base of lateral and 
median lobes. Internal sac undifferentiated. 
Anthrenus claviger. 
Has a thin curved median lobe with two median struts, with 
broad lateral lobes, rounded at tips, much longer than the median 
lobe. Basal-piece somewhat as in D. murinus. 
This is a trilobe form, and may carry with it Eetrephes 
and Ptinus qq. v. 
