642 Mr. E. E. Green on a new Genus of 



series of densely chltinous, rounded, perforated plates 

 (fig. 1, e), varying in size and form. Derm closely studded 

 with minute pores, and with scattered, larger, thick-rimmed 

 pores; also with scattered spiniform setse. Valves of anal 

 operculum together forming an oval, the base and outer edge 

 of each valve describing an uninterrupted curve ; the whole 

 surrounded by a broad, densely chitinous zone, which is 

 irregularly perforate around its inner margin. Anal ring 

 with at least ten stout setse. Stigmatic clefts shallow, without 

 specialized stigmatic spines. Margin of body with a close 

 fringe of strong spines (fig. 1, g, A), which are interrupted 

 only at the stigmatic clefts. 



Nymph very similar to the early adult insect, but distin- 

 guishable by the absence of a denser chitinous area surrounding 

 the anal aperture. Antenna3 and limbs still more rudimentary, 

 the latter (fig. 2, a) being without definite claw or digitules. 

 Cribriform plates as in the adult. Spiracular channels 

 opening directly on to the margin at the stigmatic clefts 

 (fig. 2, b). Marginal spines similar to and as large as those 

 of the adult insect. No stigmatic spines. Anal ring with 

 eight setse. 



Larva (fig. 2, c) with well-developed limbs and antenna?. 

 The cribriform plates of the adult nymph are replaced by 

 small groups of relatively large pores (fig. 2, d), interspersed 

 with which are some isolated pores of a similar structure. 

 Margin of body with simple, short, curved setse. Stigmatic 

 clefts with two stout spines (fig. 2,/), of which the anterior 

 one is lanceolate and acuminate, while the posterior one is 

 clavate and obtuse. Anal ring with six setse. 



Length 1 mm. 



Peradenij'a, Ceylon. 



In hollow branches of Stereospermum chelonioides ; asso- 

 ciated with ants (Cremastog aster sp.). The branches had 

 originally been tunnelled by some boring larva (probably of 

 a Longicorn beetle), and had subsequently been occupied by 

 the colony of ants. 



Cribroleeanium radicicola, sp. n. (Fig. 3.) 



Fully mature adult female, pale fulvous (dried examples) ; 

 rather broadly ovoid (fig. 3, a), moderately convex, the 

 medio-dorsal area raised sharply into a broad rounded carina; 

 derm soft and wrinkled, not densely chitinous. Antenna 

 (fig. 3, J) small and rudimentary, but distinctly 4- or 5-jointed, 

 the joints separated from each other by broad bauds of softer 



