512 Mr. D. Sharp and Mr. F. Muir on the Comparative 
pointed apices, consolidated together for the greater part of their 
length. Basal-piece small, symmetrical, with the opening on the 
ventral (?) face. 
This comes near to Sphaerites. 
Family NIPONIIDAE. 
Form examined: Niponius canalicollis, Japan. 
Fig. 82 Pl. LY. 
Niponius canalicollis (Pl. LV figs. 82, 82a). 
Median lobe tubular, slender and long ; lateral lobes longer than 
median lobe and enveloping them. Basal-piece forming a long tube, 
constricted near its base and bent. Internal sac undifferentiated. 
This form of aedeagus is nearest to Syntelia but differs 
in having the tubular basal-piece long, a character in itself 
not of family importance. 
Family HISTERIDAE. 
Forms examined: ister cadaverinus Hoffm., England. 
Pachylister chinensis Quens., China. Mucrolister maximus 
OL, Africa. Oxysternus maximus L., Guiana. Hololepta 
elongata Er., Andaman Islands. H. arcifera Mars., 
Cameroons. Saprinus nitidulus Fabr., England. Teretri- 
osoma stebbingt Lewis, India. 
Figs. 79, 80 and 81, Pl. LV, relate to Histeridae. 
Hister cadaverinus (P\. LY figs. 79, 79a). 
Median lobe well developed, chitinous, slightly curved, with a 
large flange running round the lateral and distal edges of the 
apical half (a), forming a cavity in which the apical armature lies 
when the median lobe is at rest. This median armature is a pair 
of two-pronged structures, amalgamated at their bases and articu- 
lated to the base of the median lobe; when the median lobe is 
withdrawn between the lateral lobes at rest, the armature lies in 
the cavity, but when it is thrust out the armature turns back. 
There is a pair of short median struts. Tegmen consisting of a 
small basal-piece with very large lateral lobes amalgamated on 
their ventral side to the tip, and on the dorsal side along the basal 
half. Internal sac undifferentiated. 
Macrolister maxims. 
A figure is given of this with the median lobe erected (Pl. LV 
fig. 80). 
