Anatomy of the Male Genital Tiihe in Colcoptera. 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 Ernobius, 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 PI. LXIV. 



This is a trilobe form. Median lobe long, slender and tubular j 

 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 Dermcstidac ; but note the 

 intimate connection of the sclerites basally at one point. 



Family MALACODERMIDAE. (s. 1.). 



Forms examined : Dictyopteo'us (or Uo^os) aurora Herbst., 

 Scotland. Lycostomus gestroi Bourg., Sarawak. ? Metrior- 

 rhynchvs thoracieus F., New Guinea. Cratomorphus dia- 

 phanus F., Brazil. Lampyris noctiluca L., England. 

 Luciola vespertina F., Pusa. Phaenolis ochracevs Gorh., 

 Centr. America. Drilus favescens Geoffr., England. Gen. 

 n. ? afif. Chauliognathus, New Guinea. Silis ruficollis Fabr., 

 England. Telephorus nigricans Miill., T. {Rhagonycha) 

 limhatus Th., and testaceus L., England. 3falachius lipus- 



