Externally resembling the species of Erythroneura with red dorsal stripe (E. lawsoniana Bk.) more than any member of its own genus. Easily separated from these of course by the submarginal vein and from all Dikraneura by the bright red or orange median dorsal stripe.

Color pattern: Strikingly cross-banded throughout. Vertex, white or suffused wit11 yellow. Anterior two-thirds of pronotum, orange-red ; posterior third, white. First tegminal band occupying bases of tegmina to a point on costal margin slightly caudad of tip of scutellum, deep orange-red. Second band, white, extending to middle of clavus Third band, dark orange-red, about as wide as length of costal plaque; connected narrowly along costal margin with first tegminal band. Fourth band, white; rather narrow. Fifth band, golden yellow; somewhat wider than the fourth in middle; much wider at costal margin; margins uneven. Sixth band, white or transparent; narrower than the fifth; extending almost to cross-veins. Seventh band, smoky black; occupying rest of tegmina. Cross-veins, whitish ; most of base of cell M4, transparent ; costal plaque, purplish red with a white spot in either end; dorsum of abdomen and most of ventral surface, black or dark brown with the exception of the face between the eyes which shades off into a bright red band marked by several small white spots.

In general appearance and coloration resembling D. spicatus DeLong and D. debilis Uhler, but with vertex much less sharply angled, and with tips of elytra slightly margined with fuscous. Length, female 3.5-3 7 mm.; male 3-3.2 mm.

The genus Cuerna Melichar as represented in Canada is reviewed. Cuerna costalis (Fabr.) is recorded for the first time. Seven new species of Cuerna are described from the Prairie Provinces and British Columbia: cuesta, fenestella, inflata, nielsoni, pseudoalba, reducta, and xyla. The identities of C. striata (Walker), C. lugens (Walker), and C. septentrionalis (Walker) are determined. All the species are described and illustrated, and a key is provided to the species-groups and species from Canada.

The correct identifications of North American species of leafhoppers of the genus Macrosteles (sensu lato) are important because of the economic significance of one of them as a carrier of a virus disease of many species of plants. In the past, such identifications have been difficult to make because the extent of the variation in colour, markings, and structure that occurs has not been appreciated fully, because some species were misidentified in previous revisions, and because there were a number of unrecognized species in the fauna.

The following are notes on the taxonomies and synonymies, and on the distributions in Canada, of the Nearctic species of leafhoppers of the genus Oncopsis Burmeister. Twenty-one species referable to this genus have been described from the Nearctic region. Seventeen were listed as valid species by Oman (1949), under Oncopsis, Macropsis, and Zinneca. One is probably not a Nearctic species. In the present paper 14 names are considered to be synonyms. This reduces the number of Nearctic species to seven, including one new species described below. Wagner (1949) discussed six species found in Germany. Of these, two were new and the remaining four had been described under a total of 14 names.

Resembling T. gillettei but somewhat larger. Two inner pairs of processes of aedeagus of about same length with innner pair not bent at middle and dorsal spine as long as shaft is wide. Length 4.5 mm.

Color: As in heavily marked T. gillettei V. D.

The species of leafhopper described belongs to the obliqua group and the dorsal colour pattern consists of the usual oblique stripes of reddish pigment so typical of this group. The species most closely resembles E. aspera from which it can be distinguished by differences in the male genitalia. The preferred hosts are apparently Betula spp.

Resembling M. prescotia Ball but with vertex margins meeting at distinctly more than a right angle. Length 4 mm.

Vertex flat slightly excavated, almost one-half wider between eyes than length at middle, margins slightly curved out, meeting at distinctly more than a right angle.

Three North American species of Latalus and four of Quontus were listed by Oman (1999). Two of these are conspecific with a third and three new species are described below. Two of the previously described species have not been found in Canada and are not discussed here. They are Deltocephalus latidens Sanders and DeLong (1919, p. 234) and Latalus uncinatus Beamer and Tuthill (1934, p. 6). They are distinguished by genitalic characters described in the original descriptions. Quontus Oman (1949) is treated here as a synonym of Latalus DeLong and Sleesman (1929), as the distinctions given by Oman (1949) intergrade and do not always hold good. Canadian species of Latalus apparently inhabit grasslands. The best specific characters are in the internal male genitalia, though the female seventh sternite shows valid characters in some species.

The genus Jassus is a very large genus of leafhoppers known to occur over a very large portion of the earth. Many species have been described from India, Africa, Central and South America, the Phillipines and several other countries. A very few species, however, seem to occur in America north of Mexico. Since only one of these species is well known, two but slightly known, and two apparently new to science, the writer feels that a short paper introducing us to the small part of the genus known to occur in the United States would not be out of place. A paper on the other American species is being prepared and should be ready for publication before long.

Stenogiffardia Evans, 1977 is considered the senior synonym of Pratura Theron, 1982 syn. nov. and Doraturella Emeljanov, 2002 syn. nov., resulting in four new combinations. Duraturopsis Melichar, 1908 syn. nov. is considered a junior synonym of Chiasmus Mulsant and Rey, 1855, resulting in one new combination. Figures of the ovipositor of Stenogiffardia parvula (Kirkaldy) are provided for the first time, and habitus images of S. parvula and Chiasmus katonae (Melichar) comb. nov. are provided.

There has been much confusion between the North American species of leafhoppers of the genus Streptanus Ribaut, partly because the species are so closely related and partly because the extent of the variation in markings and wing length was not fully appreciated. Four species have been found in North America, of which three hwe been recorded previously. The four are conspecific with species described from Europe, and the specific names that have been applied to North American species must be reduced to synonymy.

Leafhoppers of the genera Orocastus and Auridius are locally abundant in grassland regions in Western Canada. They are small insects, the males golden yellow and the females stramineous in colour. The two genera are distinguished from each other by characters of the internal male genitalia. The species are distinguished primarily by these characters and by the form of the seventh sternite of the female. There has been some confusion between the species, partly because the sexes were wrongly associated by some authors and partly because the extent of the individual variation was not appreciated fully. The following are descriptions and illustrations of the distinctive character; of the four species found in Canada, with notes on the distributions and variation. One species new to science is described and one species is reduced to synonymy.