. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. XVIIl] BRITISH SPECIES 351 lobe with apex somewhat narrowed and carrying a sharp inner tooth. Anal pyramid very long (longer than segs. 9 -f 10) {A. imperator)^. Subfamily Corduliinae. Larva of type in fig. 38. Mask spoon-shaped (fig. 32 o), the teeth of the distal border in the form of large crenations. Genus Oxygastra. Abdomen with no dorsal spines, but with faii-ly large lateral spines on segs. 8â9. Crenations of mask very large, one-third as high as wide, each carrying 14 or 15 short bristles [0. curtisi). Genus Cordul
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. XVIIl] BRITISH SPECIES 351 lobe with apex somewhat narrowed and carrying a sharp inner tooth. Anal pyramid very long (longer than segs. 9 -f 10) {A. imperator)^. Subfamily Corduliinae. Larva of type in fig. 38. Mask spoon-shaped (fig. 32 o), the teeth of the distal border in the form of large crenations. Genus Oxygastra. Abdomen with no dorsal spines, but with faii-ly large lateral spines on segs. 8â9. Crenations of mask very large, one-third as high as wide, each carrying 14 or 15 short bristles [0. curtisi). Genus Cordulia. Abdomen with small dorsal spines on segs. 5â9, rather small lateral spines on segs. 8â9. Legs very long; hind femur reaching to seg. 8. Crenations of mask medium, one-fourth as high as wide, each carrying 4 or 5 short bristles {C. aenea).. Fig. 180. Supracoxal armature of prothorax in larvae oi Aeschna. a, Ae. grandis Linn.; 6, Ae. juncea Linn.; c, Ae. mixta Latr.; d,Ae. cynnea Miiller; e, Ae. isosceles MiiUer. After Lucas and Ca)>ot. Genus Sornatochlora. Somatochlora metallica. Abdomen with very large dorsal spines on segs. 5â-9, small lateral spines on seg. 8. Hind femur reaching to seg. 7. Crenations of mask medium, one-fourth as high as wide, each with 10 bristles. S. arctica. Abdomen with neither dorsal nor lateral spines. Hind femur reaching only to middle of seg. 6. Crenations as in S. metallica, but with only 5 bristles on each. Subfamily Libellulinae. Tribe Libellulini. Larva of type in fig. 36 f. Mask spoon-shaped (cf. fig. 32 n), the teeth of the distal border forming small flattened crenulations. Species Libelhda quadrimaculata Length 23-5 Lateral abdominal spines 8, moderate; 9, small 5- Dorsal abdominal spines â7, small; 8, moderate 9, nil â fulva 21 8â9, large, bent 6- â9, large â depressa 21 8, rudimentary; 9, nil 5- â7, small; 8, moderate 9, nil Orthetrum roerulescens 16 very small, bent, on 8â9 7, rudimentary; 8, nil â cancellatum 23 small,
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