OF WASHINGTON, VOLUME XIX, 1917 129 On July 20 last I found a female of this species attacking a pupa of Melanoma i.utcrriiptnin Hald. on alder at North East, Pa. These pupae were very abundant, attached by the caudal end to the upper surface of the leaves. I captured the parasite and placed it with pupae of the beetle in a vial. It very shortly showed interest in the pupae and began its attack upon them. In ovi-positing it inserted the tip of the abdomen between the pupal legs and wings. The exposed pupa^ were not again examine* 1 until five days later when all nine were found to be parasitized. Some of the parasites were in the larval and some in the pupal stage, some of the latter being already black. It is evident that some at least, and probably all, of the host pupae had al-ready been parasitized when placed in the vial. But two, one bearing larvae and one pupae, had been parasitized for the second time and the minute larvae were feeding on the older parasites. These younger larvae were probably the offspring of the adult-captured. Both larvae and pupae of the parasites were on the venter of the host and protected by the wing pads and legs. There were from 3 to 7 parasites per host. Usually one larva was at-tached to each of the wing pads and the rest to the venter of the host. (See Plate XIV.) When the larvae had finished feeding, the host pupa was sucked dry, but retained nearly its natural form. The pupae of the parasite 1 were attached by their caudal end to the under side of the host remains. At attempt was made to get the female parasite originally cap-tured to attack pupae of Melasoma tremulae, but she paid no attention whatever to them. There seems to be no reason why the species should not attack tremulae since according to Ratze-liurg, mentioned above, it was first reared from the closely allied M. /><>/>iili. Its failure in this case to attack tremulae may have heen due to age as the parasite died two days after the intro-duction of the tri'it/iila;' pupae. On the 30th day of July the parasitism was so great that among fifty or more pupae of the host species examined, I found only three unparasit ized. EXPLANATION" OF PLATE XIV. Schizonotus xithnlili Katz. Larvae and pupae in situ beneath pupae of the liosl, MrltiKon/ii inlirru/t/ini/ Hald. TWO NEW HYDROPHILID BEETLES. BY K. A. SmuAK/ AND H. S. BARBER. A species of the Hydrophilid genus K]>/,n/</<//>Hx Lac. 1854 (Cerutodcrii* Muls. IS'/l non Westw. 1841; Scfi/'diiln't/ I.ec. 1874) found in Arizona has been mentioned by the senior writer in his
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