the Biology of sonic British Neuropera. 551 



twisted in a dextral spiral of three to four turns; vas 

 eJffierens anterior. G. tenella, as last, but spiral of four 

 to five whorls. C. flavifrons, prasina and ventralis 

 (Plate XXXIX, fig. 15), as in vulgaris, but of five to six 

 whorls. It will be seen that a series taken from salivary 

 gland, or testis characters, does not place together the 

 apparently nearly related species. 



Of the cement glands, in the female, only one is 

 fully developed, the other, as usual, being rudimentary 

 (Plate XXXIX, fig. 7, eg). Generally that of the right 

 side is developed. In C. vulgaris this is a simple sac. In 

 most other species of Chrysopa it is fringed with simple 

 diverticula, as also in NotJiochrgsa, where it is very large 

 (Plate XXXIX, fig. 8, eg). Again in Nothochry.sa the two 

 accessory glands running into the oviducts are exceptionally 

 large, spindle-shaped, with a terminal flagellum-like diverti- 

 culum (Plate XXXIX, fig. 8, ag). These glands contain a 

 viscous, colourless fluid. 



Chrysopa flava Scopoh. 

 Wing exjjanse 34-48 mm. 



This is one of our largest species of Chrysopa. One 

 character separating it from C. vittata, with which latter it 

 is often confused, is the emarginate costa in the fore- 

 wings. About one-third of its length from the base, the 

 costal margin of the wing gives a distinct dip. This is 

 sometimes obscure, and one has then to take into considera- 

 tion the fact that in vittata the basal joints of the antennae 

 are longer than in flava, also the palpi of vittata are often 

 more or less fuscous, whereas in fl.ava they are green. When 

 living, the colour of flava is yellowish-green, quite distinct 

 from that of vittata, which is rather a full green. C. flava 

 has the dorsal surface of thorax and abdomen broadly 

 yellow. In both species the head is immaculate. Males 

 oi flava are easily separated by the incrassate costal veinlets, 

 and genitalia. 



Chryso^m flava is to be taken in deciduous w^oods and 

 gardens in May and June. A few are still to be found in 

 July. I have no definite evidence of a second brood, but 

 having found eggs and imagines in late August I suspect 

 the occasional existence of such. 



The eggs are very characteristic (Plate XLII, fig. 6). In 

 laying, the female attaches the footstalk of each egg very 



