OCR Text |
Show 1882.] MR. W. L. DISTANT ON UNDESCRIBED CICADIDAE. 133 The tegmina of this species are bright green; but this is probably a variable character, as C. saundersii was originally described by Westwood as " pallide lutea," which perfectly agrees with the specimens in m y own collection. Mr. Scott, however (Proc. Zool. Soc. 1852, p. 16), states that this is not correct, but that the species is " laete viridis." The fact evidently is that these two colours are common to the species, as is so frequently the case with others, and especially with Australian members of the family. ARCYSTASIA, n. gen. Head, including eyes, slightly narrower than pronotum. Antennae with the first joints short but stout and prominent. Pronotum with the lateral margins slightly dilated and strongly depressed, the posterior angles strongly produced and rounded. Rostrum reaching the intermediate coxae. Tegmina hyaline, much longer than abdomen ; ulnar veins somewhat widely separated and divergent at base ; apical half of venation reticulated. Wings with the veins of the apical half numerous and slightly reticulated. Abdomen robust; tympana detached. Opercula of male well developed, not quite reaching basal segment of abdomen. Anterior femora strongly spined. Metasternum with a central raised furrow. Allied to Cystosoma by the reticulated venation of the tegmina, but differing in the hyaline condition of the same and the non-dilated abdomen. I have placed it next the genus Acrilla, Stal, which has the tegmina shorter, rostrum longer, and the lateral thoracic margins not dilated. ARCYSTASIA GODEFFROYI, n. sp. (Plate VII. figs. 1, l«, 16.) cf. Body above dull testaceous and olivaceous. Head with the vertex dull testaceous, with a central fuscous longitudinal impression at base, the front dark obscure olivaceous, area of the ocelli with some slightly pitchy markings. Pronotum dull testaceous with the lateral margins ochraceous, and a central fuscous longitudinal impression, of which the margins and raised base are pale testaceous. Mesonotum olivaceous, with two central obovate testaceous spots, on each side of which is a sublateral, slightly curved black fascia, the margins of which are testaceous ; cruciform basal elevation pale testaceous, with a small rounded fuscous spot on inner side of apices of anterior branches. Scutellum pale olivaceous. Abdomen testaceous, the basal segment olivaceous. Body beneath pale testaceous ; face, excluding margins, pale fuscous; sternum with olivaceous shadings. Legs olivaceous or testaceous; coxae, trochanters, bases and apices of femora, and apices of tibiae spotted with castaneous. Tegmina and wings pale hyaline; the tegmina tinted with pale ochraceous, with the venation darker ochraceous. Wings with the veins ohraceous. The face is long and subdepressed, with a broad central sulcation and faint transverse impressions. The opercula are moderately large, but do not reach the base of the first abdominal segment, outer margins almost straight, posterior marginsjbroad and slightly rounded, |