Anatomy of the Male Genital Tube in Coleoptera. 529 



the head of A. setifer and A. wollastoni differ. The 

 presence of wings in Aglycydcrus but not in Proterhinus is 

 the only distinct difference we can point to at present. 



Family MYCETOPHAGIDAE. 



Form examined : Mycetophagus qtiadripustidatus L., 

 England. 



Fig. 110 PI. LX. 



M. 4>-pustulatus (PI. 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 undiff"erentiated. 



Apparently a trilobe form with mobile median lobe. Cf. 

 Dermestidae, and Thymalus in Trogositidae. 



Family DERMESTIDAE. 



Forms examined : Dermcstcs micrinus L., England. 

 Anthrenus davigcr Er., England, 

 Fig. 121 PI. LXII. 



R murinus (PI. LXII fig. 121). 



A modified trilobe form, with long, slender median and lateral 

 lobes, the median orifice near tip on ventral face, and the mediau 

 foramen at base, where the edge is extended on each side into a 

 short median strut {m&) ; 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. miirimis. 



This is a trilobe form, and may carry with it Ectrephes 

 and Ptinus qq. v. 



