1418 The Zoologist — October, 1868. 



figure : when there are many together they only leave the principal 

 veins and here and there a little piece of the margin, as shown in the 

 right-hand leaf in the figure just referred to. 



These larvae spun up on the 12th of July ; the wasps appeared on 

 the 4th and 5th of the August following. I have since observed that 

 the change from larva to imago does not always take twenty-four days, 

 but that sometimes the unusually short period of four or five days is 

 sufficient. A larva taken on the Morelle cherry spun up on the 2 1st 

 of June, and the imago was produced on the 26'th of the same month. 

 If the metamorphosis always proceeded as rapidly six generations 

 might reasonably be looked for in favourable years. 



The pupa of this quickly-changing larva is represented at fig. 6; it 

 had spun a cocoon against the side of the glass bottle in which it had 

 been placed : this cocoon was not closed in at the side against the 

 glass, so that it could easily be observed through the side of the bottle. 

 The cocoon was double, and had the appearance of dried green sputa ; 

 fig. 6 bb represents the outer margin or cocoon, a being the inner one ; 

 the pupa is seen lying on its back, having already nearly acquired 

 its full colour, while the larval skin is not, as might have been 

 anticipated, at the end of the body, but under the meso- and meta- 

 thorax : it may, however, have been pushed up towards the head by 

 the movements of the pupa. The larvae construct their cocoons 

 against the stems of trees in cracks and crevices, and also among 

 dead and fallen leaves. 



The imago is between 7 and 8 mm. long, expanding to 16 mm. 

 The body is of a brownish black colour; head flat and broad; the 

 antennae, composed of nine joints, are of the length of the body ; the 

 first two joints are very small and the third is cylindrical, a little com- 

 pressed on the inner side; the fourth is somewhat longer, the suc- 

 ceeding joints being gradually shorter; they are hirsute, especially on 

 the upper side, but have no knobs or pectinations. The cenchii on 

 the thorax are sordid white. The legs are slender and weak ; the 

 bases of the coxae and the middle of the femora brownish black, all 

 the remainder being obscure white, or even, in some individuals, pure 

 white as far as the tips of the tibiae, which, with the tarsi, are pale 

 brown, less so, however, in the case of the anterior than of the pos- 

 terior legs (see fig. 7). 



The wings are somewhat broad and rounded, having the radius and 

 stigma very pale brown, the other nervures black. The nervure 

 between the first and second submarginal is rudimentary, but in the 



