18:7! 220 



with long, fine reddish-brown hairs projecting in all directions and concealing the 

 head and end of the body. There are six large, short, dense, subconical tufts, the 

 two anterior and two posterior ones blact, the middle ones yellowish. Head and 

 body black. The full-fed larva is a little longer, the head broad and large and black, 

 as is the I'est of the body, including all the feet. In this stage the dorsal tufts are 

 all black, with the hindermost one acute, and more prominent than the others ; two 

 segments intervene between the fifth and sixth pair. It is 1.60 inch long and 

 0.60 inch wide. 



The cocoon is loose and thin, made of the long hairs of the caterpillar, held 

 together by a thin, fine, silken web. There is an inner layer of hairs held in place 

 by a very slight web. It is grey in colour, and is an inch and a-half long by one 

 inch in diameter. 



The two specimens of the moth are male and female, well preserved, aiid agree 

 with Curtis's description, except that the hind wings are unicolorous, with no 

 " broad, blackish margins." 



In the same bottle with the caterpillars of L. Rossii occurred a Tachina 

 puparium of the usual form and 0.36 inch in length. 



Besides this species occurred Anarta Richardsoni (Curtis) and Olaucopteryx 

 Sahiniaria (Curtis) with its larva, already described by the writer in the Monograph 

 on Phala^nidse of the United States. 



The following Mallophaga have been identified by Mr. S. E. Cassino : — 

 Physostomum mystax, Burm., from Larus ehurneus ; Docophorus Zarj, Fabr., from 

 Lanis glaucus ; Goniodes colchica, Denny, from Strepsilus interpres. 



A small, blackish Poduran, Isotoma Besselsii, occurred in abundance at Polaris 

 Bay, July 5th, 1872. The Arachnida were represented by four species, two of which 

 have been identified by Mr. J. H. Emerton. Erigone psychrophila, Thoroll, occurred 

 at Polaris Bay, June 3rd, 1872, and there were two unnamed species from Polaris 

 Bay. At Foulke Fiord Lycosa glacialis, Thorell, was collected. All the spiders 

 have been sent to Dr. Thorell to report upon. Upon the body of a Bombus 

 Kirhyellus occurred several specimens of a Gamastis. 



Of fresh-water Crustacea, besides a Copepod, Baphnia recti.tpina, Kroycr, occurred 

 abundantly at Polaris Bay August 1st, 1872, as well as Branchinecta groenlandiea, 

 Verrill. — A. S. Packaed, Jr. 



[The foregoing extract from the " American Naturalist " is, to some extent, 

 complementary to my notes at p. 181, anle. Dr. Bessels does not appear to have 

 found any of the Butterflies that figure so conspicuously in Captain Feilden's 

 collections. The Bombus found by the latter is probably the known Arctic species. 

 Olaucopteryx Sabiniaria is, I believe, one of the Cheimatobioid forms mentioned, but 

 I have had no opportunity of making any critical examination. — R. McLachlan]. 



On sounds produced by Lepidoptera. — The emission of a sound by the Death's 

 Head Sphinx (Acherontia AtroposJ is well known, and the method by which it is 

 produced was established by the thorough investigation of Landois (Die Ton- und 

 Stimm-Apparate der lusekten, pp. 55-59). It is the same as that which Reaumur 

 had long since accepted, namely, that the sound was caused by the friction of the 

 palpi against the haustellum, the latter mostly remaining motionless. The inner 

 surface of the palpi is naked at the base. Microscopic observation of this space, 



