136 Christmas Island. 



witli the upper by from four to six cross-nervules. Wings hyaline, 

 ■with brown nervures. (Fig. 10.) 



Variety (?). Female. — Differs in the body being mostly black, 

 except the front, the sides of the thorax, and the base of the 

 abdomen, which are testaceous. The black central carinae are 

 merely indicated in brown, below the point where they cross ; 

 the stigma on the tegmina is almost wholly black, and there are 

 one or two cross-nervures in the subcostal area. I can hardly 

 consider these differences S2)ecific, having only single specimens to 

 compare. (Fig. II.) 



The type is from the East Coas^, and the variety from the North 

 Coast, Jtjjiuary, 1898. v^ 



Allied to iV. plena, Wlk., and^. qfflnis, Kirb. 



^ Family DELPHACID^. 



^ 8. Bidis aristella, sp.n. (PI. XV, Figs. 12, 13.) 



Long. corp. 4 mm.; exp. al. 12 mm. 



Testaceous, the two joints of the antennae long, cylindrical, of 

 equal length, and set with very short brown bristles; the second 

 joint slightly thicker than the first, subannulated, and with two 

 long brown bands, not extending to either extremity ; it is followed 

 by a bulb bearing a very fine bristle, longer than the two joints 

 together. Vertex and front quadricarinate, the carinae brown, and 

 the centre of the front and the narrowest space between the central 

 carinae, on the vertex, brown. Beyond this point, the central 

 carinae unite with the outer ones, and run backwards parallel to the 

 eyes, the space between which is very deeply concave behind ; there 

 is also a brown spot between the carinae, where they diverge. 



Pronotum with thi'ee black carinae, one central, the others 

 starting from it in front, curving round each eye. Mesonotum 

 with five longitudinal black earinae, the two outer ones slightly 

 diverging, and followed by a brown line on the sides of the 

 pronotum. Both the pronotum and mesonotum have very prominent 

 lateral angles, before which is a brown line. Abdomen testaceous, 

 with red central and terminal carinae, the latter preceded by broad 

 brown bands ; the two terminal segments are blackish, bordered 

 behind with testaceous. Ovipositor of the female blackish, up- 

 curved ; above it is a long, broad, blackish process, set with rather 

 long bristles, and bifid at the extremity. Tegmina yellowish 

 hyaline, the nervures and fringes set with short bristles, and 

 alternately brown and yellow for rather long spaces. There is 

 a large brown spot in the middle of the clavus, and in the female 

 the space between this and the base is also brown. There is also 

 a brown curved nervure marking the apical area, and the space 

 between this and the apex is much clouded with brown, especially 

 in the female ; and nearer the base the dark portions of the 



