the Biology of some British Neuroptera. 573 



on pine needles. The egg darkens to greyish just before 

 hatching, which takes place on the eighth to tenth day. 



The larva recalls that of G. perla in the colour and 

 markings of the body, but in build it is a little more 

 slender. The head markings are distinctive, and also 

 there is a dark madder subspiracular line which is more 

 distinct and less interrupted than in perla. The latter 

 is, however, probably not a reliable character. The 

 second-instar larva does not differ materially from that 

 of the third instar. 



Description of Third-instar Larva. (Plate XLII, fig. 4.) 



Length when full fed 8 mm. approximatelj'. General facies as 

 m ( '. perla. 



Head greyish-white, markings on dorsal surface dark browii to 

 black. Two dark lines run forward from the base, diverging from 

 one another about mid-way of their course to enclose a triangular 

 space in which arc two parallel dashes wliich broaden slightly 

 towards the anteiior margin of head. From the bases of the two 

 diverging lines first mentioned, on each side, is a short line running 

 more laterally and ending just about the level of the eyes. Laterally, 

 there are two almost parallel, ill-defined lines running from the 

 base of the head, and ending at the ey^on each side. Eyes black; 

 jaws pale castaneous, darker at tips ; other appendages gi-eyish. 



The body and its markings are similar to C. perla, 

 and undoubtedly vary somev>'hat, so that no useful purpose 

 would be served by giving a detailed description. My 

 description of the larva and figure of head pigmentation 

 do not agree with the figure given by Miss Alderson of the 

 head markings, and the difference is so considerable that 

 I would refer to her paper for comparison. If the head 

 markings vary to such an extent in this species they can 

 be of little specific value. I have myself only seen one 

 larva from which the above description was made. Further 

 observations would be most valuable. 



Winter is passed as a larva within the cocoon. Pupation 

 occurs in spring, and shortly afterwards the imago appears. 

 Emergence was observed to take place at 6-5 p.m. (Green- 

 wich time) on the 1st June, 1922. This example was a 

 male. Being supplied with sweet food it lived for twenty 

 days after emergence. 



