XVIII] BRITISH SPECIES 341 



Abd. much constricted at 3 ; large blue and small yellow spots on all segments. 



App. sup. 4, inf. 3; shaped as in fig. 170s. 



? abd 5355, hw 4344, pt 4-5. Abd. 



not constricted ; blue replaced by green ; 



apps. 4-5, slender, leaf-like. Fairly common. 



June Sept. 



6. Ae. coerulea Strom. (=Ae. borealis, 

 Zetterstedt). abd 45 48, hw 39 40, 



pt 3 4. Wings hyaline, C yellow. A a of Fig. 171. Anal angle of hind-wing 



hw as in No. 5. Eyes only meeting for a ? f male T in A ch - A - Ae - 



juncea Linn. B. Ae. cyanea 



short distance. Frons with a T-mark. Miiller. c. Ae. isosceles Miiller. 

 Thorax with narrow dorsal and lateral blue Original, 

 stripes. Abd. much constricted at 3 ; 1 2 



mostly blue, rest with numerous large blue spots. App. sup. 4, inf. 2, shaped 

 as in fig. 170 c. ? oM43 45, hw 38 40, pt 4. Abd. not constricted, spots 

 smaller, some yellowish ; apps. 4, leaf -like. Rare ; Northern. June. 



7. Ae. mixta Latreille. <$ abd 44 45, hw 37 39, pt 3. Wings hyaline, 

 C brown. Aa of hw as in No. 8. Eyes closely contiguous. Frons with T-mark. 

 Thorax with small dorsal yellow specks and broad lateral yellow bands. Abd. 

 slightly constricted at 3 ; fairly large blue spots on each seg. App. sup. 4-2, 

 inf. 2-5, shaped as in fig. 170 D. $ abd 4446, hw 38 40, pt 3-5. No dorsal 

 specks on thorax. Abd. not constricted, spots smaller, blue-green and yellow ; 

 apps. 5, slender, leaf-like. Rare; South-eastern. Aug. Oct. 



8. Ae. cyanea Miiller. <$ abd 54 58, hw 45 50, pt 2-5. Wings hyaline. 

 Aa of h>r 3-celled (fig. 171 B), rarely 4 5-celled. . Eyes moderately contiguous. 

 Frons with T-mark. Thorax with large oval yellowish -green dorsal marks 

 and broad yellow lateral bands. Abd. constricted at 3, with fairly large blue 

 and smaller yellow spots. App. sup. 5, inf. 2, shaped as in fig. 170 E. $ abd 

 55 58, hw 48 52, pt 3. Dorsal marks of thorax yellow. Abd. not constricted, 

 colours as in o ; apps. 4-5, leaf-like. Fairly common ; Southern. July Oct. 



9. Ae. isosceles Miiller ( =Ae. rufescens Vanderlinden). <$ abd 47 49, 

 hw 41 i2, pt 3. Base of hw deeply saffroned. Aa of hw 3 6 cells with large 

 dark memb. (fig. 171 c). Eyes closely contiguous. Frons without a T-mark. 

 Thorax brown with yellow lateral lines, no dorsal markings. Abd. brown, 

 scarcely constricted at 3, a large yellow triangle on 2. App. sup. 5, inf. 2, 

 shaped as in fig. 170 F. $ abd 50 52, hw 41 42, pt 3-5. Slightly stouter 

 than o, closely similar; apps. 3-5, leaf-like. Rare; Fens and Norfolk Broads. 

 May June. 



Genus V. Anax Leach (fig. 172). Upper sector of arc. arising close up to B, 

 lower one at about middle of arc. Rspl and Mspl much curved, 5 7 cell-rows 

 below Rs and M t respectively at middle. Aa of hw rounded in both sexes. 

 Auricles absent. 



10. A. imperator Leach (=A. formosus Vanderlinden). <$ abd 55 56, 

 hw 46 47, pt 4-5. Wings hyaline; hw with long narrow memb., whitish 

 basally. Eyes closely contiguous, blue. Thorax greenish, with dark lateral 



