the British Neuroptera-Planijyenma. 197 



b. Ungues dilated at the base (PL XI. 



fig. 4 6). . . G. abbreviata. 



h. b. Ungues simple (PL XI. fig. 4 a). 



C. j^hyllochroma. 



a. a. Colour blue-green C.perla. 



Too much reliance must not be placed upon this tabu- 

 lar arrangement^ as it will not determine species that 

 may occur with us, though not yet discovered ; attention 

 must be paid to the detailed descriptions. Most of the 

 species lose their colour very rapidly after death. 



1. Chrysopa flava, Scopoli. 



Hemerobius flavus, Scop. Ent. Carn. 270 (1763); Chry- 

 sopa flava, Hag. Ent. Ann. 1858, p. 20. C. subfalcata, 

 Steph. 111. vi. 105 (1836). G. vittata, Schn. Mon. Chrys. 

 65, pi. vi. fig. 1, larva, pi. vii. imago, (not of Wesm.); 

 Brauer, Neurop. Aust. 60. 



Pale green ; dorsal surface of thorax and abdomen with 

 a yellowish longitudinal line in the middle. 



Antennae shorter than the wings, becoming obscure 

 towards the apex; the basal joint shorter than the head. 

 Vertex raised, the elevated portion somewhat triangular, 

 the apex being extended between the basal joints of the 

 antennge. The head is quite immaculate. 



Prothorax rounded at the sides, rather narrowed an- 

 teriorly; immaculate. 



Abdomen slightly pubescent. 



Legs nearly colourless; ungues brown, dilated at the 

 base internally. 



Wings elongate, apex acute. Anterior wings with the 

 costal margin strongly excised after about one-fourth of 

 its length from the base. Neuration almost wholly pale ; 

 the costal veinlets in the basal portion blackish at their 

 points of junction with the sub-costa; some of the other 

 basal veinlets also blackish; pterostigma, in all the wings, 

 scarcely darker, elongate. In the posterior wings the 

 costal veinlets are mostly half blackish ; other veins and 

 veinlets pale. 



After death, the colour becomes uniformly pale yellow. 



Length of body 6-7 lines; expanse of wings 17-22 lines. 



A common insect in summer, especially in trees bor- 

 dering streams. 



The excised costal margin of the anterior ^^^ngs will 

 readily separate this species. 



