572 Mr. D. Sharp and Mr. F. Muir on the Comimmtirc 



of the lateral cliitin strips proceed two median struts {ms). Tegmen 

 formed of a semi ring-piece with a very strong central strut on the 

 ventral face. A long first connecting membrane {cm 1) connects the 

 tegmen to the median lobe, and a very long second connecting 

 membrane {cm 2) connects the tegmen to the body wall ; the basal 

 part of this second connecting membrane {cm 2) is chitinised and 

 forms a tube around the aedeagus ; on the right of it is attached the 

 " spicule " {sp). Internal sac large, without armature. 



Obs. — We have examined various other Curculionidae 

 without finding distinctions of great importance. But the 

 various speciaHsations will probably prove to be of much 

 assistance in the classification of this enormous complex. 

 Comparison of the cap-piece of the tegmen in Attelabini, 

 Rhynchitini and Brachycerini with long-rostrum-forms 

 {i.e. probably higher) like Mecocwynus is suggestive of 

 this. 



Family SCOLYTIDAE = (Ipidae of some). 



Form examined : Tomicus {Ips of some) laricis Fabr., 

 England. 



Fig. 226 PL LXXVII. 



The male organs of many of this family were carefully figured 

 and described by Lindemann * and again by VerhoefF.f It is a 

 Rhynchophorous type. We figure Tomicus laricis (PI. LXXVII 

 fig. 226). Median lobe short and tubular, with a pair of slender 

 median struts. Tegmen ring-shaped with a central strut on ventral 

 side (rt). Internal sac fairly long, with a thin membranous flagellum 

 arising from the apex, supported by a couple of thin chitin rods (h). 



We must refer workers in this group to Lindemann's above- 

 mentioned paper for details of the various species. 



The evolution of the tegmen in this family appears to 

 be from a ring-piece with well developed lateral lobes, to 

 reduction of the lateral lobes, the ring-piece being correla- 

 tively reduced into a small Y-piece on the ventral side of 

 the median lobe. Cf remarks on Chrysomelidae. 



Family PLATYPIDAE. 



Form examined : Platypus (sp.), Honolulu, Crossotarsus 

 harhatus Chap., New Guinea. 



* Bull. Soc. Imp. Mosc, Vol. XLIX (1875) No. 1. 

 t Archiv f. Naturgesch. 1896. 



