Anatomy of the Male Genital Tule in Coleoptera. 537 



basal part is turned up at a right angle (b), 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. 



Luciola vcspertina. 



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 Cratomorphus, 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 (PI. LXIV fig. 138). 



Median lobe well developed ; the dorsal face chitinous, apex 

 bluntly pointed ; a little before the apex there is a broad spine 

 directed basally (6) ; base broader where it is articulated to the 

 lateral lobes; the whole organ, basally of the spine h, 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 1 38a. 



