Anatomy of the Male Genital Tube in Coleoptera. 557 
Family TRICTENOTOMIDAE. 
Form examined: Zrictenotoma thomsoni Deyr., hab. ? 
Figs. 194 and 194@ Pl. LX XII. 
Trictenotoma thomsom (Pl. LX XII figs. 194, 194). 
Median lobe long, thin and curved upward at the base ; the apex 
chitinous, continued as a chitin strip along the ventral face, at the base 
this chitinous strip is a curved bar (6) which connects with the tegmen. 
Tegmen consisting of a well-defined basal-piece (bp) with a large 
sclerite (a) on the ventral aspect of the median lobe ; near the base 
of the sclerite (a) arise two long thin lobes, spatulate at tips and 
hairy. The bars (b) from the median lobe are connected with the 
lateral basal edges of the large sclerite and form a spring which 
brings the median lobe back into position when the muscles are 
relaxed. Internal sac undifferentiated. The large sclerite may repre- 
sent the lateral lobes of other forms, as it is closely connected with 
the basal-piece ; in that case the remarkably long lobes (Il), are 
secondary differentiations, or appendages of the conjoined lateral 
lobes. 
This is a beautifully constructed organ. It is a little 
like Pytho, but the orientation of the tegmen is reversed 
and in that respect approaches Pyrochroidae. 
Family BRUCHIDAE (HLartidae of some). 
Forms examined: Bruchus rufimanus Boh., England. 
Caryoborus nucleorum Fabr., Brazil. C.sp.? (not named in 
Brit. Mus.), 8. America. 
Figs. 195, 196 and 197 Pl. LXXII. 
Bruchus rufimanus (Pl. LX XII figs. 195, 195a). 
Median lobe tubular, with the dorso-basal margin produced into 
a parallel-sided strut (s), the median orifice being at the apex. 
Tegmen forming aring-piece with a pair of lateral lobes on the dorsal 
aspect and a wide strut on the ventral aspect. Internal sac large 
with armature at the base closing the orifice, consisting of a curved 
spine (a) on the ventral face and a chitinous plate (b) on the dorsal. 
Caryoborus sp.? (Pl. LX XII fig. 196). 
Median lobe a flattened tube, with the ventral and dorsal edges of 
the median orifice pointed, the ventral one produced beyond the 
dorsal one, thus giving the orifice a slit-like shape on the dorsal 
face; the dorso-basal edge is produced into a single dorsal strut, 
TRANS. ENT. SOC. LOND. 1912.—PaRT III. (DEC.) PP 
