44 G. W. KIRKALDY ON THE STRIDULATING ORGANS 



examination. These two species (Nos. 18 and 19) have been 

 placed by all modern authors in a separate subgenus from 



Nos. 5 17 and 20 — 22, on account of the pronotal keel being 



continuous and well marked. This, however, is a very insignificant 

 character, and the two species are structurally indistinguishable 

 subgenerically from nigrolineata, striata, fallenij etc. 



Species 20. C. lateralis Leach (Fig. 30). 

 (= hieroghjphica in Saunders, I.e.) 



Palae, <$, cultrate. One row of twenty-eight pegtop-shaped pegs 

 following the curve of the upper margin. 



Species 21. C. lugubris Fieber (Fig. 31). 

 Palae, (^, subcultrate, lower margin curved ; one row of 

 twenty -two pegtop-shaped pegs reaching from the base to § of 

 the palar length, and another consisting of eight elongate acute 

 pegs near the apex on the upper margin. 



Species 22. C. selecta Fieber (Fig. 32). 

 (= lugubris in Saunders, partly.) 



Palae, J", subcultrate, subtruncate apically. One long curved 

 row of twenty-eight pegs, the twenty-two basal being pegtop- 

 .shaped, the six apical elongate and acute. 



Subgenus 4. Corixa in sp. 

 (= Macrocorisa in Saunders, I.e.) 

 Differs from Arctocorisa by having, inter alia, the strigil on the 

 left-hand side. 



Species 23. C. affinis Leach (Fig. 33). 

 (= atomaria in Saunders, I.e.) 

 Palae, cJ, long cultrate, obliquely rounded (subtruncate) 

 apically ; one row of about thirty-eight pegs reaching from near 

 the base to the apex, following the upper margin ; the basal 

 eighteen are blunt, suboval, the apical ones are longer and more 

 acute. 



Species 24. C. geoffroyi Leach (Fig. 1 — 4, 7, 34 and 35). 

 Palae, ^, subparallel, elongate, upper margin rounded close to 

 the truncate apex. A single row of about thii'ty-two blunt 

 .suboval pegs, following the curve of the upper margin. 



