During the past three years a great deal of attention has been paid to the use of derris and pyrethrum as basic, non-poisonous insecticidal material. This work was stimulated primarily by the tolerance placed upon arsenicals and other so-called poisonous insecticides. Considerable progress has been made and a number of formulae have been developed for the control of certain insect pests with the use of derris and pyrethrum that give safe, effective and economical kill. New applications are constantly being devised and it is the purpose of this paper to briefly review some of the newer developments in the field of derris and pyrethrum investigations.

Male. Very similar to serraticoris Lint., but on the whole more contrastingly marked on the forewings, the light purplish-gray color being replaced by a whitish gray, heavily suffused with smoky; t. a. and t. p. lines poorly defined, much as in serraticornis, the former showing the usual sharp angle, outlined by a dark streak, above vein I and the latter in this same area with the usual small dark patch, closely approached to t. a. line and separated from it by a palish area. Rather heavy blackish suffusion in median area along inner margin.

Herewith are described five new species of North American Plecoptera. Included also is a description of Isoperla petersoni Needham (nec Claassen). Dr. Needham published figures of the nymph and adult of this species, anticipating that I would publish a description of this species before the Utah bulletin appeared in print. In 1931 I described the nymphs of this species as my own. Under the rules of the International Code, however, I believe that this species should now stand as indicated in this paper.

About a year ago Mr. F. M. Brown called the writer's attention to the aberrant venation of one secondary of a specimen of Erebia magdalena Strecker. The aberration, of the type shown in Figure I, consists in the presence of an extra cross-vein connecting veins Rs and M1 a few millimeters beyond the end of the cell. Later, in studying series of other species of the genus, a similar variation from the normal (Figure 2) turned up in several specimens. The facts are presented in the following table, in which the results of examination of some material from the genus Oeneis is also included.

It has long been known that some of the Phasmidae discharge a fetid fluid from certain glands. King (1867) published a note on his observations of a phasmid in Jamaica, identified as Anisomorpha buprestoides (Stoll) but which Bates believed to be a true Phasma, in which he stated that the prothorax contains two glands, secreting a fetid fluid which is discharged through two elevated pores and serves as a defensive agent. This author further stated that these nocturnal, or crepuscular, and gregarious insects are almost always found in the adult stage in copulation.

Triepeolus helianthi Robertson. Lethbridge, Aug. 11 (G. A. Mail.) Described from Illinois, but known to be widely distributed.

Triepeolus stricklandi n. sp.

♀. Length about 8 mm.; black, including mandibles (except a dull red band in middle), antennae, tegulae (except red spot on outer side) and legs (except small joints of tarsi, which are red) ; eyes pale green, with a purplish suffusion below; pubescent markings pale cream-colour, pure white in region about antennae, the under side of abdomen without light markings; spurs black.

Length 5-7 mm. Elytra black with margins yellow-brown, prothorax with rather wide margins, brown, disc black with the usual pale apical spots common to the genus. Legs, antennae and ventral surface black. Antennae stout with the usual needle-like appendage to the terminal segment. Prothorax wider than long, the translucent areas irregularly shaped anrl rather large, the disc convex, black, with the central portion not punctate, shining, the margins reflexed as is usual in the genus. The hind angles of the prothorax are narrowly rounded.