﻿ODONATA, ETC., TAKEN BY DR. T. A. CHAPMAN. 51 



Description of Nymph op S. fiaveolum. (Plate III.) 



General colour sepia, but varying in depth of tint. Length, 

 including anal appendages, about 16-5 mm. ; greatest breadth about 

 5-5 mm. Head, transversely about 4-25 mm. ; longitudinally about 

 3 mm.; in shape pentangular, somewhat rectangular behind; surface 

 fairly smooth, except for a few hairs of considerable length on the 

 occiput ; top of head rather flat ; colour of head fairly uniform, though 

 in places there are some slightly darker markings. Eyes, rather 

 large, situated at the forward corners of the head, nearly hemi- 

 spherical in shape. Antenna of seven segments ; length about 

 2 mm. ; the basal segment globular, the next cylindrical, the rest 

 hair-like ; the fourth segment is short compared with the rest of the 

 hair-like ones. Labium (mask) decidedly and deeply spoon-shaped, 

 covering the mouth, somewhat rapidly narrowed towards the hinge, 

 which is situated in front of the insertion of the mid-legs ; mid-lobe, 

 with apical angle considerably greater than a right angle, and margin 

 almost entire ; moveable lobes (palpi) sub-triangular, outer and inner 

 margins convex and nearly entire, distal margin nearly straight and 

 slightly toothed ; moveable joint at junction of outer and distal 

 margins rather long and slender (to all appearance of little use for 

 purposes of holding) ; mental setae about nine in each comb, lateral 

 about eleven in each, all pale and slender, inserted in a rufous 

 socket. Prothorax narrow, collar-like. Mesothoracic spiracles large 

 and conspicuous. Mesothorax and metathorax smooth, mottled with 

 darker brown markings. Legs nearly concolorous, neither very 

 rough nor very hairy, though tibiae have a fringe of hairs ; length of 

 fore-legs about 9 mm., of mid-legs about 9-5 mm., of hind legs about 

 14 mm. Abdomen practically without hairs, slightly mottled and 

 bearing a few dark dots dorsally, smooth and unicolorous ventrally ; a- 

 small blunt mid-dorsal spine on the hind margin of each of segments 

 six, seven and eight, and small lateral sharp ones on the hind margin 

 of segments eight and nine ; the ninth segment truncated behind, the 

 tenth small. Anal appendages small, pointed, surrounded by hairs, 

 dorsal appendage of moderate length, triangular ; laterals shorter and 

 more slender ; lower ones slender and longer than the other three. 



Material. — A nymph-skin with the recently emerged female, and 

 another nymph-skin presumably of the same species (and agreeing 

 on examination) ; from Gavarnie, Hautes Pyrenees, July 12th-31st, 

 1914 ; brought home and given to the author by Dr. T. A. Chapman. 



When compared with the nymph of S. striolatum {vide Entom. 

 xlvii. pi. ii. 1914) the great difference in length of the lateral 

 abdominal spines will be at once noticed, and these provide a 

 sufficient means of discriminating the species. 



In May Dr. Chapman paid a visit to Pallanza in Italy, whence 

 he brought : — 

 Odonata. 



Libellula quadrimaculata. One male. 



Orthetrum cancellatum. One female. 

 Trichoptera. 



Tinodes ivceneri. A series. 



Polycentropus flavomaculatus. One. 



F 2 



