1882.} MR. W. L. DISTANT ON UNDESCRIBED CICADID^. 133 



The tegmina of this species are bright green : but this is probably 

 a variable character, as C. saimdersii was originally described by 

 Westwood as " pallide lutea," which perfectly agrees with the speci- 

 mens in my 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 arc 

 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 pos- 

 terior angles strongly jiroduced and rounded. Rostrum reaching 

 the intermediate coxse. Tegmina hyaline, much longer than abdo- 

 men ; ulnar veins somewhat widely separated and divergent at Ijase ; 

 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 reach- 

 ing 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 tiie 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, 1</, \b.) 



(S . 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. 

 jNIesonotum olivaceous, witli 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 testa- 

 ceous, 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 wiUi casta- 

 neous. Tegmina and wings pale hyaline ; the tegmina tinted witli 

 pale ochraceous, with the venation darker ochraceous. Wings with 

 the veins ohraceous. 



The face is long and subdepressed, with a broad central sulcatiou 

 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 margins^broad and slightly rounded. 



