_ Anatomy of the Male Genital Tube in Coleoptera. 535 
Basal-piece curved, and, together with the basal parts of the lateral 
lobes, forming a bulb enveloping the base of the median lobe. 
Internal sac very little differentiated, without armature. 
Ptilinus pectinicornis is on the same type as Hrnobius, but the 
median lobe is slender and symmetrical and has a slender rod-like 
piece arising from the base and along the dorsal face (as if there were 
two median lobes), Lateral lobes also slender and more symmetrical. 
Basal-piece forming, with the bases of the lateral lobes, a bulb which 
covers the base of the median lobe. Along the ventral side of the 
aedeagus lies a narrow sclerite, bilobed at tip; this appears to pertain 
to the body segments, and arises from the membrane connecting the 
aedeagus to the chitinous body wall (second connecting membrane). 
These two are greatly modified trilobe forms, and their 
connection with such a form as Ptinus fur is easily 
conceivable, 
Family ECTREPHIDAE. 
Form examined: Polyplocotes longicollis Westw., Aus- 
tralia, 
Fig, 135 Pl. LXIV. 
This is a trilobe form. Median lobe long, slender and tubular ; 
median orifice near apex ; median foramen at base, where the edge 
turns up dorsally and articulates to base of lateral lobes. Lateral 
lobes long and thin, the rounded tips bearing hairs; the bases of 
the lobes touch both dorsally and ventrally ; the inner side exca- 
vated and enveloping the base of the median lobe. Basal-piece 
small, forming a ring round the bases of the lateral and median 
lobes, the ring being widest on the ventral face. Internal sac 
undifferentiated. 
This type approaches the Dermestidac; but note the 
intimate connection of the sclerites basally at one point. 
Family MALACODERMIDAE. (s. 1.). 
Forms examined : Dictyopterws (or Eros) aurora Herbst., 
Scotland. Lycostomus gestrot Bourg., Sarawak.? Metrior- 
rhynchus thoracicus ¥., New Guinea. Cratomorphus dia- 
phanus F., Brazil. Lampyris noctiluca L., England. 
Luciola vespertina F., Pusa. Phaenolis ochraceus Gorh., 
Centr. America. Drilus flavescens Geoffr., England. Gen. 
n.? aff. Chauliognathus, New Guinea. Silis ruficollis Fabr., 
England. Telephorus nigricans Miill., 7. (Hhagonycha) 
limbatus Th., and testaceus L., England. Malachius bipus- 
