the antenna? of Hcpicdidic — Lepido2)tera Jngcdai. 501 



is usually smaller tlian succeeding segments, being as it 

 were a transition between the pedicel and clavola, each with 

 its definite functions; this joint has usually only rudi- 

 mentary appendages on antennae with pectinations ; rarely 

 is true pectination developed, and never does it attain 

 proportional length. The proximal joint of the clavola, 

 at least, lags behind the others in the onward march of 

 specialization. 



The sexes on the whole agree as to number of clavola 

 segments per species, for instance Hepialus liumuli, $, ^ , 

 and var. Hetldandiea, have an equal number; sometimes a 

 variation in number occurs, but such has been noticed 

 mostly in the female sex. It is an interesting fact that 

 sometimes segments are partially or wholly coalesced, the 

 sutures being obliterated, but hairs, bristles, etc., are 

 normal. I have noted this in Charagia virescens, C. clcqjh- 

 nanclrcV, Hepialus argentco-maculcda, Cihyra sylvinus. The 

 division of the clavola into more or less segments does not 

 seem of first importance, their functions being collective. 

 As far as possible several specimens of each of the following 

 species have been examined, to arrive at the probable 

 typical number of clavola segments. 



Hepialus = unpertinate antennae. 



humidi. 20 clavola segments, a few scales on five 



basal segments. 



velleda. 23 clavola segments, a few scales on first 



ba?al segment. 



h(pu]inus. 24 clavola segments, one or two scales 



on first basal segment, also single 

 scales per segment on apical thirteen. 



hectns (^ . 12 clavola segments, one or two scales 



on first and second basal segments. 

 Siibg. Sthenopis ^ nnpectinate antennae. 



argenteo-maadata. 21 clavola segments, a few scales on six 

 basal segments. 

 Subg. Charagia = nnpectinate antennse. 



daphnandrx. 28 clavola segments, numerous scales on 



four basal segments and dorsal scales 

 on next five segments $ ; dorsal scales 

 on nine basal segments $ . 



virescens. 39 clavola segments, numerous dorsal 



scales on six basal segments $ ; few 

 dorsal scales on six basal 9 • 



