344 



BRITISH SPECIES 



[CH. 



Wings coloured, at least by a dark basal patch on hiv. Abd. short, considerably 

 widened and depressed. Lobe of prothorax small. 



15. L. quadrimaculata Linn. <J abd 28 29, hw 35 36, pt 4. Wings 

 with a yellowish- brown band along C, broadest at base; a small dark patch 

 at nodus ; a large triangular dark brown patch at base of hw ; tips of wings 

 sometimes smoked; pattern variable. Thorax hairy, brown, with lateral 

 yellow bands edged with black. Abd. brown, shaded with black; lateral 

 yellow spots on 3 8. App. sup. 4, pointed, inf. 2 triangular, tip slightly 

 bifid. ? abd 2829, hw 3336, pt 3-5. Similar to <?, but abd. broader; 

 apps. 3-5, leaf -like. Common. Apr. Sept. 



16. L. fulva Miiller (fig. 131). $ abd 2627, hw 3334, pt 2-5. Wings 

 hyaline except for a medium-sized triangular black patch at base of hw, and 

 short brown lines in cu of fw and sc of hw ; tips sometimes clouded. Thorax 

 hairy, brown. Abd. of adult pale blue with terminal segments black. App. 

 sup. 2-5, pointed ; inf. 2, triangular. $ same size as $ ; wings suffused with 

 yellowish-brown along C; tips smoky. Abd. brown with irregular dorsal 

 black markings on 3 10 ; apps. 2, pointed. Local. June Aug. 



Fig. 175. Wings of Orthetrum coerulescens Fabr., <J (Hw 28 mm.). Original. 



17. L. depressa Linn. <$ abd 26 27, hw 35 37, pt 3-5. Wings hyaline, 

 with an elongated dark brown patch at base of fw, and a larger triangular 

 patch at base of hw. Thorax very hairy, brown, with bluish or yellowish 

 dorsal stripes. A bd. excessively wide and depressed; blue in adult; 36 with 

 yellow lateral spots. App. sup. 2, slightly toothed beneath; inf. 1-5, slightly 

 notched. $ similar to $, but abd. brown ; apps. very short. Very common. 

 Apr. Aug. 



Genus X. Orthetrum Newman (fig. 175). Fw with about 12 Ax in fw, 

 the last complete. Sectors of arc. united ; t once crossed in fw, free in hw. 

 Wings hyaline. Abd. only moderately widened. Lobe of prothorax large. 



18. O. coerulescens Fabricius (fig. 175). 3 abd 2526, hw 2829, pt 3-5, 

 yellowish; memb. white. Only 1 cell-row between Rs and Rspl. Thorax 

 blackish, with bluish or yellowish dorsal lines. Abd. of adult blue. App. sup. 



