Beetle collectors are lucky. Weather permitting, they can hunt almost the year through, for many species of Coleoptera hibernate as adults. When snows are deep our treasure houses are old stumps, and dead trees with the bark still on but loose. Better yet are November days when early frosts have sent the lakeshore forms to shelter, and every driftwood log is home to a dozen species.

In 1946, a water-dispersible powder (formulation P. 530) containing 6% gamma benzene hexachloride and 50% goulac (lignin pitch) was tested in the field for control of black cherry aphid (Myzus cerasi (F.)), apple aphid (Aphis pomi Deg.), mealy plum aphid (Hyalopterus arundinis (F.)), wooly apple aphid (Eriosoma lanigerum (Hausm.)) and pear psylla (Psylla pyricola Foerst.). The material was compared at 0.25 lb. gamma isomer per 100 gal. in (1) water alone, and (2) plus 0.5 gal. of either distillate oil (42. S.S.U. Vis. 100° F., 77% U.R.) or summer oil (60-64 S.S.U. Vis. 100° F., 78% U.R.). Three gallons of each mixture were applied by bucket pump and two trials were made, the first beginning July 10 and the second July 16. Results are given in Table 1.

This is the second of this series (1) of notes discussing certain phases of Coleopterology. The present paper again deals with the family Silphidae and is a continuation of the first. In this note two species are discussed as well as the synonymy of some species of Nicrophorus and notes on the family in general.

Some geometrid larvae exhibit dimorphism in colour. Several interesting observations of this phenomenon were made during the study of larvae of the species, Semiothisa sexmaculata Pack., Dysmigia loricaria Evers., and Nepytia canosaria Wlk.

In these observations, certain points stand out. Although larvae of S. sexmaculata are always green until they reach the last instar, both brown and green phases occur in that stage. After the last larval moult, a transition period of approximately two days is required for larvae to acquire the colouring of the brown phase. On the other hand, specimens of D. loricaria may pass their entire larval period in either a brown or a green phase (as do the larvae of N. canosaria, descriptions of which may be found in Can. Ent. 75: 186-189) or they may change (as do some larvae of S. sexmaculata) from the green phase to the brown phase in the last larval instar. For Dysmigia larvae to undergo this transformation, approximately three days are required.

The following list of specimens is supplementary to two previously published articles (1944, Canad. Ent. 76:163 and 1945, Canad. Ent. 77:214) on Essex County material. Appended to the list are miscellaneous records of 17 species captured in Ontario locations other than Essex County. These have been added to this paper since they are thought to be of noteworthy interest. The species in each part follow as closely as possible C.W. Leng's Catalogue of the Coleoptera of America north of Mexico.

The occurrence of the small moth, Acentropus niveus Olivier, in North America has been recorded by Forbes (1) and Sheppard (2). The former author collected a male specimen at Minetto, N. Y., and the latter captured three specimens at Montreal, Canada.

Forbes (1938) recorded a single specimen of Acentropus niveus from Oswego, New York, and Sheppard (1945) recorded three specimens taken by him at Montreal, Quebec. These are the only published records from North America of this species, which is well known in Europe.