Anatomy of the Male Genital Tuhe in Coleoptera. 511 
the consolidated and reduced lateral lobes. Internal sac large, 
swollen towards the apex where it is produced into two small 
diverticula, between which the ejaculatory duct opens, the apical 
dorsal part bearing spines, and a large spine on each side a third 
from the base. 
Palimbolus sp. (Pl. LII fig. 60). 
Median lobe bulbous with right edge of median orifice prolonged 
into point; except fora batch of membrane on dorsal side (m) the 
median lobe is chitinous; median foramen small, on ventral face. 
Lateral lobes small, subcircular bodies applied closely to median 
lobe slightly posterior of the median foramen, Internal sac well 
developed with two chitin rods (a) supporting the ventral surface 
and forming two rounded projections beneath the opening of the 
ejaculatory duct. 
The few forms of Pselaphidae that we have examined 
show very interesting differences which future investiga- 
tion will probably show to be characteristic of distinct 
groups, unless connecting forms should be found. The 
type is closely allied to the Staphylinid. The possibility 
of Bryaxis having a true basal-piece included in the 
aedeagus requires investigation, as the possession of such 
a structure would prevent their being regarded as direct 
offshoots of the Staphylinidae. 
Family SPHAERITIDAE. 
Form examined: Sphaerites glabratus Fabr., Scotland. 
Fig. 78 Pl. LV. 
Sphaerites glabratus (Pl. LV figs. 78, 78a). 
Median lobe thin, only the tip visible; median orifice at tip. 
Lateral lobes large, consolidated together for the greater part of 
their length on the ventral, and for half their length on the dorsal 
face, thus forming a tube in which the median lobe lies. Basal- 
piece small and asymmetrical, the chitinisation forming a broad 
circular band. Internal sac undifferentiated. This is very like 
Syntelia. 
Family SYNTELIIDAE. | 
Form examined: Syntelia histeroides, Japan. 
Syntelia histeroides (Pl. LV figs. 77, 77a). 
Median lobe well developed, long, curved, tubular, with a pair of 
median struts, Lateral lobes very long and curved towards their 
MM 2 
