Anatomy of the Male Genital Tube in Coleoptera. 541 



the tegmen is attached, the ventral edge of median orifice produced 

 into a point. Teguien long and narrow, the cap-piece being long 

 and narrow, bilobed at tip. Internal sac long. 



Phloeopliilus cdwardd (PI. XLV fig. 144). 



Median lobe long, thin, slightly flattened, with two short median 

 struts. Tegmen forming a ring with a large, flattish plate, extend- 

 ing basally on the dorsal side (o). This is an abnormal type and 

 at present we cannot fit it in to any of the Malacoderm group. 



The Malacodermidae consist certainly of more than one 

 family, but as our review of them does not enable us to 

 speak of the number or composition of the families, we 

 have used the old, vague term. Some additional re- 

 marks on the subject will be found under the heading 

 " Taxonomy." 



Family CLERIDAE. 



Forms examined : Natalia iJorcata Fabr., Australia. 

 Trorjodcndron fascicidaiwni Schr., Australia. Cylidrus 

 sp., New Guinea. 



Figs. 147, 148 and 148a Pis. LXV and LXXVI. 



Natalis imxata (PI. LXV fig. 147). 



Median lobe long, slender and membranous, supported by a 

 chitinous strip down each side. These are prolonged into a pair 

 of median struts. Tegmen sheath-shape, the division between 

 lateral lobes and basal-piece obliterated. Internal sac undiff'eren- 



tiated. 



Cylidrus sp.. New Guinea. 



Median lobe short, prolonged into a pair of long median strutp. 

 Tegmen sheath-shape without division between lateral lobes and 

 basal-piece. Internal sac undifi"erentiated. 



Trorjodendron fascicidatum (PI. LXVI figs. 148 and 148a). 



Median lobe well developed, the median orifice at tip on ventral 

 face ; a pair of median struts expanded at their ends. Tegmen 

 large and forming a sheath, deeply cleft on dorsal, and slightly on 

 ventral face, but no line of demarcation between lateral lobes and 

 basal-piece. Internal sac undifferentiated. 



This type approaches Trogositidae. 



TRANS. ENT. SOC. LOND. 1912. — PART III. (DEC.) O 



