124 SPHECIA APIFORMIS. 



ness ; the outside is dark brown, the inner lining of 

 glossy silk is purplish-brown, except at the end, where 

 the head of the larva lies, and there the silk is dirty 

 white, and not so stout as elsewhere. 



I do not know if the larva becomes shortened soon 

 after it spins up ; those I had varied in length, the 

 longest being 33 mm. ; the figure is somewhat wider 

 than deep, widest at segment 3, more flattened in front, 

 and more cylindrical and smaller behind, 13 being the 

 smallest segment ; the head hard and horny, flattened, 

 about two-thirds the width of the second segment, into 

 which it is retractile ; 2 is longer than any other seg- 

 ment, and has a shield wide in front and narrowing 

 behind ; the positions of the usual dots marked each 

 by a tiny hair ; the spiracles small, the thoracic legs 

 small but well developed ; the ventral prolegs scarcely 

 developed at all, looking more like a fold of the ventral 

 skin, and the discs of hooks are no more than two little 

 rows of points for each foot ; the thirteenth segment is 

 curved under, and the anal prolegs are like two lobes 

 at its end, and are furnished with scarcely discernible 

 points for hooks ; the skin is soft and glossy, yellowish- 

 white in colour, the head rich chestnut-brown, the 

 mouth paler, but outlined with black. The second 

 segment is more yellow than the rest of the body ; 

 spiracles ringed with red browu, the hairs brown. 

 Altogether this larva, though looking like a soft maggot, 

 is well adapted for eating its way through wood. 



The pupa seems to vary in size ; probably the female 

 is generally larger than the male. I measured one 

 22 mm. long and 8 mm. at its widest; in figure elon- 

 gate, cylindrical, the back of the thorax rounded off 

 over the back of the head, and where this curve meets 

 the flatter outline of the underside, between the eyes 

 and just in front of the base of the antenna-cases, is a 

 slight projection, 1*5 mm. in length, with central keel 

 and side ribs, apparently to be used in cutting open 

 the end of the cocoon; the eye-covers and leg- and 

 antenna-cases very distinct, but all soldered close to 



