ErytJiroiinna. 



247 



Nymph (Fig. 41). 

 Body long and slender ; bright green, pale livid buff, 

 brown, or almost black ; length, including caudal lamelLt, 

 30mm., greatest breadth about 375mm. //tv?,'/ pentagonal, 

 ver}' narrow from front to back, 

 475mm. by 2mm. Autcinice (Fig. 42), 

 seven-jointed, distal two being very 

 intimatel}- united and appearing to 

 be one ; basal two stout and dark ; 

 next long, slender, and dark, with 

 a pale ring round centre ; the 

 rest pale and slender. Mask (Fig. 43), 

 diamond - shaped, with the anterior 

 corner rounded ; extending to the in- 

 sertion of the first pair of legs ; the 

 two palpi bearing a row of long hairs 

 near the outer margin ; their anterior 

 margin jagged ; the movable hooks 

 sharp and slender, and overlapping 

 when the mask is drawn back and at 

 rest ; a row of rather long hairs runs 

 in a curve across the body of the 

 mask, and on each side is a row of 

 short ones near the outer margin. 

 Eyes rather small, somewhat hemi- 

 spherical, situated at the anterior 

 corners of the head, dark in colour. 

 Between the e}'es are a few dark dots 

 and markings. On the central part of 

 the occiput, which is very narrow, are also some 

 dark markings, while its posterior corners bear 

 conspicuous spines. Prothorax somewhat rectangular 



Fk;. 42. — Antenna 

 OF Nymph of Erv- 



THROMMA NAIAS. 

 (Much magnified.) 



