1877.] 277 



went out to the wood and captured anotlier specimen of the HylophUa 

 in the act of ' squeaking.' The sound was quite distinct at a distance 

 of ten feet or more. Next morning I treated him (it was a male) in 

 the same manner as I had the first specimen, and with a similar result. 

 I found that a good imitation of the sound may be made by rubbing 

 the point of a knitting-needle on the closed blade of a clasp-knife" 



Dr. Buchanan AVhite has here directed attention to the membrane 

 lining the strongly-marked ventral abdominal thoracic cavity in 

 JIalias 2)rcisina)m as a probable medium of sound ; for my pai't, I 

 abandoned the position, since the membrane in the living insect did 

 not seem sufficiently tense, but rather flaccid, besides being apparently 

 destitute of any lima, and also because I since find that the elbows on 

 the inner margin of the fore-wing in S. quercana and frasinana 

 produce a stridulous sound by catching on either lateral piece of the 

 scutellum of the metathorax, to which they lock, as in the Noctuina, 

 by a callosity. And I ascribe this sound to a lima-form striation at 

 the inner side of the anterior edge of the piece, which is distinct 

 in quercana. 



Lastly, among the Lepidoptera, as in the Cohopfera, there are 

 certain tiny species that afford indications of stridulation, although 

 they produce little or no sound that can reach the tympanum of the 

 human ear. Thus I once noticed an exasperated little Tortrix among 

 a group of Dicrorliamplia sequana, toying round a buttercup in a rank 

 grass plot at Cowes, suddenly place a fore-wing on edge and rapidly 

 rub it over the costa of the hind-wing ; and I have since found trans- 

 verse furrows in this portion of the hind-wang membrane that might 

 by courtesy be termed a lima. 



Guildford : February 12th, 1877. 



DESCRIPTION OF A NEW HARMA FROM WEST AFRICA. 



BY W. C. HEWITSOJf, F.L.S. 



Haema Hecatjea. 

 Upper-side : female, dark brown, paler on the basal half of both 

 wings. Both wings crossed beyond the middle by two bands of white, 

 and a sub-marginal band of pale brown lunular spots bordered below 

 by a line of black. Auterior-wing with the first band divided into 

 spots near the costal margin : the second band composed of sis 

 separate spots, commencing near the apex in a small spot ; the spots 

 becoming large and pyramidal towards the anal angle. Posterior-wing 

 with the first band broad, divided by black nervurcs, and marked by 

 four black spots : two near the costal margin, one between the first and 

 second median nervules, and the other near the anal angle ; the second 

 band of six pyramidal spots, and a lunular spot at the anal angle. 



