Brachi'tron. 1 7 3 



ill the costal region ; anal angle of hind-wings rounded. 

 Spots on abdomen \-ello\v instead of blue. Aiial 

 appendages long, flat, leaf-like. Oi'ipositor reddish, 

 reaching end of ninth segment ; sheaths present. 



Variation. 



The pterostigma of the right fore-wing of a female 

 in my possession is crossed by two transverse nervures. 



Distinction from iEschnas. 



Although there is little real resemblance in detail 

 between B. pratcnsc and some of the species of ^-Esclnia, 

 yet there is a certain amount of superficial likeness ; but 

 the following points will distinguish B. pratcnsc: (i) 

 The very narrow pterostigma. (2) The dense pale 

 down, especiall}- on thorax and front segments of 

 abdomen. (3) The bifid lower anal appendage of the 

 male. 



Nymph (Fig. 35). 



Body not hairy ; elongated, not greatly contracted at 

 base of thorax ; colour pale brown, with greenish tinge 

 to abdomen ; length 40mm., breadth just over 6mm. 

 Head raised in the vertical region, pentagonal, /■5mm. 

 across transversely. Antenna; seven-jointed, basal \.\\o 

 short and swollen, distal five slender, short, about equal, 

 end one pointed. 3Iask broad anteriorly, tapering 

 gradually backwards half-wa}- to the joint, then nearl)- 

 straight, reaching the insertion of the mid-legs ; flat ; 

 middle lobe produced slightly in a \-er\' obtuse angle, 

 cleft in the centre, and fringed with reddish spines ; palpi 

 rounded somewhat at end, toothed, point turning 



