40 G. W. KIRKALDY ON THE STRIDULATING ORGANS 



Genus 2. Cymatia Flor. 



Face, excavated S, flattened ? ; strigil absent, no stridular 

 area. Palae, S, elongate, siibcylindric, terminated by a powerful 

 curved claw ; no stridulator. Palae, 2 , similar to c^, but no strong 

 curved claw. 



Species 1. C. coleojHrata (Fabricius). 

 Species 2. C. honsdorffii (Sahlberg). (Fig. 5). 



The pala in coleoj^trata is very similar to that of honsdorffii, but 

 very much smaller and a trifle broader. 



Genus 3. Corixa Geoff roy. 

 Stridulator and stridular area present in S (present also in ? 

 but in a much less highly developed degree). 

 Palae, S^ not terminated by strong flattened claw. 



Subgenus 1. Glaenocorisa Thomson. 



(= Oreinocorixa in Saunders, I.e.) 

 Face, excavated c?, flattened ? . Stridulator and stridular 

 area present S- Strigil present. 



Species 1. C. cavifrons Thomson (figs. 8-11). 



Palae, ^, subtriangular elongate, with a marginate concave 

 enlargement on the upper margin near the base. Stridulator 

 composed of nearly seventy teeth, ranging in form from short 

 somewhat peg-top shaped ones at the base to long slender bristle- 

 like ones near the apex, the transition. being gradual. 



Pala, ? , subtriangular, elongate. 



Subgenus 2. Callicorixa F. B. ^Yhite. 



Face, excavated ^, convex v^ . Strigil absent. Stridulator and 

 stridular area present S- Palae, $, cultrate. 



Species 2. C. 2)raeusta Fieber (figs. 12 and 13). 

 ( = ? sodalis in Saund., I.e., = ? holdi in Saund., I.e.) 



The palae {^) are "elongate, suddenly dilated at about half 

 their length from the base, the dilated portion concave and bent 

 forwards, apex subtruncate." There are two rows of pegs, one 



