Anatomy of the Male Genital Tube in Coleoptera. 527 
base. Tegmen forming a ring-piece, the dorsal cap being broad, 
short and bilobed at apex, the ventral portion of the ring being 
produced into a strut. Internal sac undifferentiated. 
This type approaches the more generalised Coccinellidae 
and Endomychidae. 
Family LATHRIDIIDAE. 
Forms examined: Lathridius lardarius Deg., England. 
Corticaria pubescens Gyll., England. 
Figs. 116 and 117 Pl. LXI. 
Lathridius lardarius (Pl. LXI figs. 116, 116q). 
Median lobe small with median orifice at tip and median foramen at 
base. Tegmen forming a large cap-piece, the distal part formed of 
the consolidated lateral lobes, curved and pointed. The basal-piece 
large, curved, and the basal corners produced into two short struts 
(s). Internal sac undifferentiated. 
Corticaria pubescens (Pl. LXI figs. 117, 1172). 
Median lobe short, with large median orifice which nearly divides 
it into a dorsal and a ventral plate, a median strut (ms) proceeds 
from the dorso-basal edge. Tegmen forming a small ring with a 
large strut (tg) on the ventral side. Internal sac large, covered with 
stout chitinous hairs. 
We cannot place this type near to any other in the 
present defective state of our information. Corticaria and 
Lathridius are so distinct that they can hardly be retained 
in one family. 
Family ADIMERIDAE. 
Form examined: Adimerus crispatus Sh., St. Vincent. 
Fig. 118 Pl. LXII. 
A, crispatus ? (fig. 118). 
This is a trilobe form with well developed median lobe with 
median orifice at apex; lateral lobes embracing the sides of the 
median lobe; a large basal-piece, chitinous on ventral side. In- 
ternal sac undifferentiated. It approaches the Mycetophagidae 
and the Enarsus portion of the Colydiidae. The organ is very 
minute, 
NN 2 
