—— 
Anatomy of the Male Genital Tube in Coleoptera. 497 
This is a highly developed form of the Aleocharid type. 
The structure is very large in comparison with the size of 
the insect. 
Homatota londinensis. 
Median lobe broad and flattened ; tip on ventral aspect curved 
downward, and drawn out into a fine point, tipped with a fine 
pin-head knob. Lateral lobes large and broad; on the lower 
margin, near base, arises a long curved flattened spine. Sac not 
examined. 
Homalota elongatula. 
Median lobe bulbous at base, membranous on dorsal side, 
chitinous on ventral, the distal chitinous edge prolonged into a 
laterally compressed curved tip. The lateral lobes large, flat, and 
rounded at apex. 
Homalota pavens. 
Median lobe swollen at base, chitinous on ventral side, mem- 
branous on dorsal, distal end not twisted. Lateral lobes large. Sac 
not examined. 
6 c. LZa 
Tachinus subterraneus (Pl. LII figs. GY, Gle). 
Median lobe short and bulbous, the ventral aspect formed by a 
chitinous sclerite jointed at apex, the dorsal by a circular sclerite, 
with a semi-membranous connection between (m), The median 
orifice has a dorso-distal position and the median foramen is small 
with a ventro-medial position. The lateral lobes joined together to 
near tips, attached to median Jobe near median foramen on 
posterior (ventral) side. Internal sac large and complex, with a 
flexible, chitinous sclerite (a) supporting each side; at the distal 
end there is a large egg-shaped chitinous body (6) with a short 
tube on one side on which the ejaculatory duct opens. The use 
of this hollow egg-shaped body we are unable to conjecture. 
Tachinoderus grossulus, 
Distal half of median lobe tubular, basal half bulbous; median 
orifice distal ; median foramen on ventral aspect in median position ; 
semi-membranous around middle portion of bulbous base. Lateral 
lobes small, amalgamated to near tip. Internal sac large, with 
bilobed diverticulum on ventral face, and small chitinous process 
at apex where the ejaculatory duct opens. 
