THE YOUNG NATUKALIST. 



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yellow, They all have clear wings and the first three have reddish yellow 

 bodies. In L. striolata the thorax is blackish with three oblique black streaks 

 on the sides. The abdomen of the male is reddish, that of the female is 

 yellow brown with two small yellow dots on each segment. Z. flavola and 

 Z. meridionalis are alike in size. In length each is an inch and a third, and 

 the expanse of wings two inches and two lines, both have the base of the 

 wings tinged with yellow, in flavola this yellow colour extends in the hind- 

 wings to quite a third of their length. In both species the pterostigma or 

 spot towards the tip of the wing is yellow, fiavtifa has the nervures of the 

 wings blackish. 



In the scarce Libellula Fonscolombii, the nervures of the wings are for the 

 most part reddish, the pterostigma is large and yellow, and the base of the 

 wings is tinged with yellow. It is rather larger than L. flavola, and has a 

 body of the same length as Z. striolata, that is an inch and five lines. The 

 expanse of wings in both species is two inches and a third. It must be 

 remarked that in Z. Fonscolombii the hinder tibise of the male insect are black 

 on the outside. Z. vulgata is the same size and colour as Z. striolata, but 

 the abdomen is without yellow dots. 



The species with legs entirely black are Z. sanguinea, Z. scotica, and Z. 

 dubia. The first-named has the wings tinged with yellow at the base in both 

 sexes in Z. scotica, those of the male are entirely clear, and only those of the 

 female have the yellow tinge at the base. Z. sanguinea and Z. dubia are 

 about the same size in expanse of wing, viz., two inches two lines, but Z. 

 sanguinea has a somewhat longer body, being sixteen lines in length, while 

 the rare Z. dubia is only fifteen lines. Dubia is easily recognised by the 

 blackish spot at the base of the wings, both have the pterostigma reddish ; 

 in Z. sanguinea the thorax is olive brown, red above, but with this exception 

 the colour of the body is red in the male, yellow brown in the female. In 

 Z. scotica the thorax is blackish, or olive brown with three yellow spots on 

 the underside behind the legs. The abdomen is short, the entire body 

 measuring only an inch and two lines, and there are generally two yellow 

 streaks on each segment, but specimens of the male occur nearly entirely 

 black. The pterostigma of the wings are square and black. 



All the dragonflies in the genus Cordulia are bronze green in colour. 

 C. arctica occurs in Perthshire in July. It has a yellow spot before each eye, 

 and the face is spotted with yellow. In the English C. anea the face is un- 

 spotted. C. Curtisii has the face bronze green, the abdomen has yellow spots 

 on the back, in shape it is cylindrical in the male, compressed in the female. 

 All three have clear wings, and the pterostigma is black. In size they are 



