Insects. 



8475 



brown elevations (a species of Uredo?). The gall is hollow, having 

 a thickness of from 1 to 2 mm. About the end of September the full- 

 grown larva may be found inside, with a quantity of rather dry excre- 

 ment of a pale brown-colour. When young the larva is almost 

 translucent glassy white, the head gray ; when full-grown it is yellow 

 or orange-yellow, length about 1 centimetre. Head shining, obscure 

 yellow, with two elliptical black spots on the sides, in which are the 

 eyes; the jaws are clear brown. Each segment of the body is 

 divided into three folds, each of these bearing some indistinct slightly 

 projecting wart-like eminences ; in some individuals a brown spot 

 was observed on the abdomen close to the anal valve, in all a double 

 black spine above the anus. 



These larvae have twenty legs, all yellow or yellowish white, and 

 more or less translucent. The larva is represented at fig. 2, plate 10. 

 During September and the beginning of October they gnawed round 

 holes in the galls, and made their way out; and after creeping about 

 for some time they buried themselves in the sand which I had placed 

 at the bottom of their bottle. 



In the spring I examined the sand, and found some cylindrical 

 cocoons, rounded at both ends, entirely covered externally with 

 grains of sand, as shown at fig. 3. Internally the walls were chestnut- 

 brown, shining, smooth ; on holding a piece up to the light it can be 

 seen that the cocoon is made up of transverse and not of longitudinal 

 fibres. The larva remains in the cocoon without change until the 

 month of March, only becoming a little shorter and stouter. 



At the end of March I found a pupa in one of the cocoons ; of 

 this I made a drawing (see fig. 4). It was of a greenish white colour, 

 with reddish white wing-cases, and singularly attenuated for a tenthre- 

 dinous pupa. The first imagos made their appearance on the 8th of 

 April ; these were a male and a female : during the following twelve 

 days others came out. From general characteristics and the neuration 

 of the wings it is evident that they must be regarded as belonging to the 

 genus Nematus, which is also shown by the antennae. Both sexes are 

 about the same size, namely, 6 mm. long, including the antennae 1 cen- 

 timetre. Expansion 13 mm. Male shining, more or less brownish black; 

 the first three joints of the antennae are black on the upper surface, red- 

 dish brown underneath, all the others being reddish both above and be- 

 low. Head black, except that from the eyes downwards the colour is 

 pale yellow ; jaws black ; palpi obscure yellow, black at the base. Legs 

 reddish yellow, only the coxae and a line on the under side of the 

 femora black ; the last two or three joints of the anterior and middle 



