TROCHILIUM CYNIPIFORME. 127 



tioned one larva was 10 mm. long, and another quite 

 15 mm., and probably full-fed, as it was enclosed in a 

 tough cocoon of gnawed bark in a chamber hollowed 

 on the surface of the piece of bark which came with 

 it ; these larvas were alike, except that the bigger one 

 had a pink tinge. The figure is somewhat flattened, 

 segments 2 and 3 stouter than any others, the body 

 tapering thence to 13, the head flattened with rounded 

 outline, set on to the upper edge of 2, the jaws like 

 short, straight, powerful nippers, a trapezoidal plate 

 on 2, and a small plate on 13, the skin soft, trans- 

 parent, the places of the usual dots marked with tiny 

 hairs ; the thoracic legs small, the ventral prolegs so 

 far developed as to have oval discs of hooks, anal pro- 

 legs soldered together as two lobes of the last segment ; 

 the colour dirty white, the internal organs showing 

 through blackish, the head red-brown, with black jaws, 

 the plate on 2 tinged with brown and with darker out- 

 line, plate on 13 slightly brown, spiracles indistinct, 

 yellowish. (J. H., 25, 11, 86.) 



Trochilium sphegiforme. 



Plate XXVIII, fig. 1 (see ante, p. 49). 



Mr. Buckler's notes are as follows, " In alder suckers, 

 October 8th, 1866, from Burnt Wood, Staffordshire. 

 Larva from Mr. Tester, June 17th, 1867, Balcombe, 

 Sussex." 



Trochilium scoli^forme. 



Plate XXVIII, fig. 2. 



The only note appended to this species is, " In old 

 birch bark, April 10th, 1863." 



