THE GOOSEBERRY SAW-FLY 



95 



16-18 mm. long. It consists of a head and twelve segments, 

 which are indicated by the appendages, the spiracles, and 



the repeated pattern of 

 black dots on the skin. 

 The head is shining black, 

 with many short hairs, and 

 is flattened in front and 

 behind. There is a small 

 simple eye on each side, 

 and a minute three-jointed feeler. 

 The mandibles are strong and 

 toothed. The first pair of maxillse 

 are represented chiefly by a pair 

 of six-jointed palps. The labium 

 carries the spinneret and a pair of 

 three-jointed palps. The skin of 

 the body is nearly transparent, and 

 shows the colour of the parts 

 within ; thus it appears green over 

 the digestive tube, which is loaded 

 with green food ; but is yellow 

 close to the head and hinder end, 

 where the fat-body comes to the 

 surface. Many black spots diver- 

 sify the skin ; these are hard and 

 shining, and bear short bristles or 

 groups of bristles. Most of the 

 segments are sub-divided into three 

 annuli, which are marked out by 

 constrictions, and bear each a row 

 of spots extending across the back. 

 The thoracic segments bear pointed, 

 three-jointed legs. The abdominal 

 segments 2, 3, 4, 5, 6, 7, and 9 

 (the last) are provided with pseudo- 

 pods or prolegs, resembling those 

 of caterpillars, but without the 

 crown of hooks. The pseudopods 

 seem to act as suckers, for the 

 larva can creep up a plate of glass. The last pair are slightly 

 united at the base, and form claspers, which are not much 



