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doing! Their, at first sight, unattractive appearance in part, perhaps, accounts for their neglect; yet not a few of the species ave extremely beautiful, The scarcity of reliable, but not too expensive, books of reference, is doubtless another reason; but this should not deter us from collecting these insects and observing their habits. When a sufficient demand exists for the books, they will probably be forthcoming from some quarter or other. The Hemiptera, again, is another despised group: but why? The insects are generally small, it is true, but science is not chiefly concerned about mere size, and as to colour this class includes some real beauties, I would therefore urge Entomologists to extend their operations to some of these too little known classes of insects. A little more mutual help is also much wanted among us. Thus, when a Lepidopterist is out collecting and meets with insects other than those he is specially interested in, he might often be of use to some fellow workers if he would devote a little trouble for their sake, and pick up "bugs," or bees, or other insects which he knows them to care for. In return he would invariably be helped in his pursuit. “Fellow feeling makes us wondrous kind.” Speaking for myself, I shall always be glad to pond Lepidoptera in exchange for Dipiera or Homeoptera, and shall only want to know concerning any specimens sent to me the locality from whence they are obtained. S. L. Mosley, Hon. Sec., Huddersfield Naturalists' Society, Primrose HIll, Huddersfield.

A Parasitic Worm Infecting the Air Sinuses of the Common Weasel.—April 13th, 1878. Mr. Montagu Browne, the Naturalist, forwarded to me, for the purpose of ascertaining the cause of death. an adult specimen of the common weasel, which had not been trapped or shot. I carefully examined all the abdominal and thoracic viscera, squeezing up their structures into thin layers for the purpose of finding any parasitic larvae or adult worms. I searched the alimentary canal from the mouth to the anus but found no parasites, Not suspecting that the air sinuses and nostrils might contain parasites, I was stupidly content to let therm pass with a cursory glance; but as I desired to observe the arrangement of the bones of the ear in this animal, I commenced to skim the head, and arriving at the point of union of the frontal bones, I observed a round hole in the median line, one-eighth inch in diameter, covered with a clear transparent membrane, which was continuous above and internally with the periosteum. I could not make out any mucous lining, though I suppose there should have been one, for the sinus communicated immediately with the left nostril. On removing this clear membrane, which looked as though it covered a hole filled with ink, I found what at first sight appeared to he small elongated clots of blood. There were no movements whatever, no apparent sign of life; however, I examined one of them, and made out that it was a worm, {a female,) full of eggs for about one half its length, and the remaining half occupied by many hundreds of minute, young, living, wriggling worms. There were in this sinus six Specimens, four females, and two males. The male is considerably smaller than the female, not reaching to even half her size in the largest and best developed specimen. The female, the largest, measured one inch and a quarter long, and the thirty-second of an inch in diameter, and the smallest specimen, which contained both eggs and young alive, measured half en inch long and about four lines in greatest diameter. After being satisfied us to their character I proceeded cautiously to search the remaining sinuses, the brain and its cavities. The brain was healthy as far as the microscope could determine, but the sinuses were full of the parasite. In the sinus of the left temporal region no less than fourteen of those creatures were discovered coiled around one another and dead, twelve of them females and two males; in the air passages of the