I04 British Dragonfiics. 



spherical knobs, with a prolongation backwards diagonally 

 towards the mid-line of the head. Top of head slightly 

 concave. Vertex not raised. Oeeipiit somewhat rect- 

 angular ; hind corners much rounded ; hind margin 

 nearly straight. Pivthorax rather broad in centre ; margin 

 formed of a raised rim. JMeso-tlioraeie spiraeles exposed 

 and conspicuous. Thorax almost uniform in colour. 

 Wi)ig-cases rather broad, about 7mm. long. Legs of 

 moderate length, very stout, rather wideh' separated at 

 their insertion (perhaps formed for burrowing) ; all parts 

 hairy ; coxae with lighter rings, femora obscureh' dark- 

 ringed ; length of fore-legs about I2"5mm., of mid-legs 

 I3"5mm., of hind-legs i8mm. Abdomen x^ixy hairy, 

 brown, with lighter and darker mottlings ; sutures light, 

 with a few pale spots dorsally ; segments fairl\- equal 

 except 10, which is small ; ninth inclined to be somewhat 

 truncated ; on lateral carina; at the hind corner of each 

 segment a tuft of hairs ; on segments 4 to 8 mid-dorsal 

 hairy tubercles pointing backwards. Anal appendages 

 rather short, sharp-pointed, hair}' ; upper and lower about 

 equal, acuteh' triangular ; laterals short, more rounded, 

 dark. [From a bred female. Fig. 25.] 



Date. 



Quite earl\' in May this Uragonfl}' appears upon the 

 wing, and if the season is a forward one it ma}' be 

 seen even in the preceding month. April 28 (Surre}', 

 C. A. Briggsj is the earliest date that I ha\'e found 

 recorded, while one was seen in Richmond I'ark as 

 late as August 14, in 1897 (W. J. Ashdown ). It is 

 usually at its best in Ma\' and )unc. 



