Anatomy of the Male Genital. Tube in Coleoptera. 537 
basal part is turned up at a right angle (6), and articulated to the 
base of the lateral lobes (pa); the ventral face is membranous. 
Lateral lobes large, subtriangular, with a constriction dividing the 
apical third off from the rest ; their base meeting on dorsal aspect 
at point of articulation ; there is a short spine (c) on the inner side 
of each of the lateral lobes. Basal-piece forming an asymmetrical 
ring-like sclerite, the sides of which do not meet on the dorsal 
aspect. Internal sac undifferentiated. 
Lampyris noctiluca. 
This is the same type as Cratomorphus and very similar to it in 
details. 
Lucwola vespertina. 
In this the lateral lobes are consolidated to near their tips on 
the dorsal aspect ; the basal-piece is symmetrical, of the Lampyris 
type ; median lobe slightly bulbous at base. This comes somewhat 
near to Drilus, though more complex and specialised. 
Phaenolis ochraceus. 
This is the same type as Oratomorphus, but the flanges near the 
apex of the median lobe are not so large, and the bent basal part is 
shorter ; the lateral lobes are smaller, truncate, and have no con- 
stricted apical portion; the basal-piece is more slender and more 
asymmetrical. Internal sac undifferentiated. 
Drilus flavescens (Pl. LXIV fig. 188). 
Median lobe well developed; the dorsal face chitinous, apex 
bluntly pointed; a little before the apex there is a broad spine 
directed basally (b); base broader where it is articulated to the 
lateral lobes; the whole organ, basally of the spine b, evenly curved ; 
ventral face membranous, supported by a thin chitin strip along 
its whole length. Lateral lobes broad and truncate, consolidated 
together at their base on the dorsal aspect, widely apart on the 
ventral face. Basal-piece forming a wide chitinous piece extending 
from one lateral lobe to the other, the central part of the ventral face 
being membranous (m). Internal sac undifferentiated. 
This is comparatively a very simple form, departing but 
little from the general trilobe type. In our figure (138) 
the lines marking the incision between the lateral lobes 
should extend further forwards, so as to indicate the point 
of articulation shown in 138a. 
