While engaged in the re-arrangement of some boxes of Cerambycidæ recently, the peculiar modifications of the ordinarily very simple pattern of coloration in the genus Crossidus brought about the desire to see to what extent and under what circumstances certain of these modifications were carried on or existent. The results of the studies ensuing thereupon are presented in the present paper.

Eigth examples bred from larvæ in the Yosemite Valley differ from Mr. Cresson's description in having both wings unifrom smoky blackish, about as dark as the hind wings of Hylotoma scapularis, Klug. In the ♀, the pale parts of the legs are not white, but of an obscure sordid whitish, tinged with brown, and not contrasting with the black body parts; the abdomen is obscurely banded with brwon between the segments.

No. 3123 is Ophiderma flava, Godg.

No. 4416 is the type of Thelia cratægi. Fh.

No. 1875 is the type of Ceresa brevicornis, Fh. The brief description given by Fitch is correct, but not sufficiently complete. Good characters are present for separating it from its congeners.

The following table contains all the species of Thereva known to me as occurring in this country north of Mexico. Thereva tergissa, Say. (corusca, Weid.), and T. crassicornis, Will (non Bellardi), belong to Psilocephala.

The following notes were presented to the Entomological Society of Washington, May 1, 1980, under the title of “Some insects affecting certain forest trees.” They are herewith somewhat revised and sifted for publication, since the matter which follows is of some value.

The family Phalangidæ is readily seperable from the other families of Phalangida by having but one simple (not compound) claw at the end of each tarsus and having a claw af the end of palpus.