Anatomy of the Male Genital Tube in Coleoptera. 555 
The ventral aspect of the tegmen causes us to place 
this family on one side along with Pyrochroidae, ete. 
But we must recall our remark as to the difficulty of 
determining this point. 
If it could be established that the tegmen is composed 
of a modified chrootic sternite, then this type might be 
the most primitive of the coleopterous aedeagi. 
Family MORDELLIDAE. 
Forms examined: Anaspis frontalis L., England. Pele- 
cotomoides conicollis Cast., Australia. Tomoxia biguttata 
Gyll, New Forest. 
Figs. 189, 190 and 191 Pl. LXXI. 
Anaspis frontalis (Pl. LX XT fig. 189). 
Median lobe slender, tubular and semi-chitinous, and with median 
orifice at (tip. Tegmen consisting of a pair of pointed lateral lobes 
consolidated at their base, and a narrow, long basal-piece. The 
tegmen lies on the dorsal aspect of the median lobe, with a 
membranous connection on the ventral aspect. Internal sac un- 
differentiated. 
This aedeagus does not approach either in structure or 
orientation the other forms we have examined among the 
Mordellidae. It is possible that it would find a better 
place near Anthicidae. 
Pelecotomoides conicollis (Pl. LX XT fig. 190). 
Median lobe long, slender and curved, median orifice near tip on 
ventral face. Tegmen consisting of a large, basal sclerite (bp) on 
the ventral aspect of the median lobe, with a pair of highly 
modified lateral lobes, in the form of crescents. Internal sac 
undifferentiated. 
Tomoxia biguttata (Pl. LX XI, fig. 191). 
Median lobe long, thin and membranous, supported by a chitinous 
rod along each side, which join together about the middle and 
continue as a single median sclerite. Tegmen consisting of a 
sheath-like sclerite and a flat sclerite bearing three irregular pro- 
cesses, the two sclerites being connected by a membrane. Internal 
sac undifferentiated. 
We are not satisfied with our knowledge of this family 
and hope it will be shortly increased. ‘I'he orientation of 
