Life Histories in the Hcinalid G-roup of Lepidoptera. 431 



direction. It is more than a coincidence that Hepialidx 

 with this form of antennae, the males especially, have the 

 third pair of legs reduced — Hepialus humuli, vellcda, 

 argenteo-macidatus, or aborted — Charagia viresccns, ligni- 

 vorus, eximia, ramsegi, daplinandnv, and the tibia pro- 

 vided with a conspicuous tuft of hair which is probably a 

 sexual, possibly a scent organ ; the bladderlike hind tibiae 

 of He^nalus hectus seem to be the latter. Hcpialus Iwpu- 

 linu SIS, an interesting species with normal legs, otherwise, 

 so far as my material goes, specialisation of the tibiae of 

 hind-legs is co-existent with simple antenna?. Hcjnalidc'B 

 with specialised antennae have normal legs. 



The clavolar segments of Gorgopis hacotii are most 

 interesting, the transverse projection on one side of the 

 shaft, appropriately securiform, is covered with fine hair, 

 but I cannot detect sense hairs (Fig. 5) ; G. hacotii is 

 very different from G. libania, which has the shaft 

 attenuated and a prolonged appendage at either side ; on 

 the dorsal surface are stout sense hairs which apparently 

 touch the appendage of next segment ; there is no ventral 

 appendage. 



Hcpialus {Cihijra) sylvinus has a robust clavolar shaft 

 with dorsal "sense hairs" and lateral appendage at either 

 side, short, comparatively thick, without " sense hairs." 

 Hcctomancs have very similar antenna", they have no 

 ventral appendage (Figs. 8, 8a). 



Porina ccrvinata, iimhraciclata and signata, have elevated 

 anterior edge, semipectinate laterally, and a posterior 

 ventral hump ; these appendages are hairy, the shaft has 

 sense hairs (Fig. 6). I examined a living specimen of 

 F. ccrvinata under a compound microscope, and in what- 

 ever direction it moved its antennae, the " sense hairs " 

 remained stationary on the segments. P. fuscomaculata 

 has attenuated shaft to the clavolar segments, bi-lateral 

 appendages hairy, " sense hairs " on the shaft and append- 

 ages, and also a hairy ventral hump (Fig. 7). 



Trictciia Icdigrinthica has a very specialised form of 

 clavolar segment, the lateral appendages are prolonged, 

 hairy and with "sense hairs," between them a long hairy 

 ventral appendage ; the clavolar segments have therefore 

 three appendages strongly developed (Figs. 9, da). 



[See explanalioii of PLATEa V and Xlfacimj the Plates.] 



