y 
90 DR. A. GUNTHER ON THE ZOOLOGICAL (Feb. 6, 
the other halfway between the latter and the apex of the membrane : 
length of body 22 millimetres, of entire insect with the wings closed 
4 millimetres. 
Three specimens, Charles Island (C. Darwin). 
A very pretty and well-marked species. 
9. MoNANTHIA CYTHARINA, 0. Sp. 
Fifiform, general aspect and coloration of M. debilitata. 
Head pyramidal, white, the central area longitudinally subcylin- 
drical, with a central carina, reticulated with brown ; thorax much 
wider than long, with compressed angular lateral wings, subsinuate in 
front, centre of anterior margin deeply excavated, three well-defined 
longitudinal keels, the central one straight, the two lateral ones con- 
cave ; brown, with white borders and keels, the whole surface reticu- 
lated with darker brown; scutellum cordiform, brown, with darker 
reticulations, a central longitudinal white keel; basal half of hem- 
elytra broad and externally strongly convex; apical area narrower 
and less convex ; each hemelytron with a longitudinal fusiform area 
enclosed by a keeled margin, from the base to the middle; central 
area brown, with the keels and a central 4-shaped marking white ; 
costal borders white, with a quadrate spot near the base and several 
at apex dark brown; the whole surface reticulated with dark brown ; 
legs and antenne testaceous: length 3 millimetres. 
One specimen, James Island (C. Darwin). 
HemirpTeRA Homoptera. 
1. Issus VARIUS. 
Issus varius, Walker, Cat. Homopt. ii. p. 372. 
James and Charles Islands (C. Darwin). 
2. Issus ROSTRIFER, N. Sp. 
Head conical, rostriform when viewed laterally, leaf-like above, with 
a marginal and a central longitudinal ridge ; pronotum considerably 
wider than long, convex in front, concave behind, with a prominent 
tubercle behind the antero-interior angle of each eye; meso- and 
metanotum narrow, irregular, with a central longitudinal carina ; seu- 
tellum triangular with sinuated sides, and narrow marginal ridge ; 
abdomen laterally compressed, somewhat depressed at base, so that 
the scutellum, seen laterally, forms with the metanotum a projecting 
tubercle ; tegmina semicircular, reticulated ; colour testaceous, head 
above brightest in tint: length 3 millimetres. 
Charles Island (C. Darwin). 
3. DELPHAX SUBSTITUA. 
Delphax substitua, Walker, Cat. Homopt. ii. p. 354. n. 21. 
Charles and James Islands (C. Darwin.) 
4, DeLPHAX VICARIA. 
Delphax viearia, Walker, Cat. Homopt. ii. p. 355. n. 23. 
Charles and James Islands (C. Darwin). 
