THE PURPLE-HORN SAW FLY. 389 



This is a really splendid insect. The head and thorax are 

 metallic green, just like green foil, and the abdomen is bur- 

 nished blue, glossed with green. The legs are of the same 

 colour as the abdomen, and the antennae are purple, for which 

 reason I have given it the specific name of cocdnocems, or 

 "purple-horn." The wings are brownish, but glossed with 

 green. 



Our last example of the Saw Flies is the Derecyrta 2'>ictipcnnis. 

 The example which is here drawn is in the British Museum, 

 and was. brought from Ega, in the Amazons, by Mr. Bates. 



It is a pretty though not a splendid insect, and derives its 

 beauty quite as much from the wings as from the body. The 

 head is shining and black, lookiufj ver^ nnich like a little black 



FiG. 189. — Derecyrta plctippnnis. 

 (Yellow and brown.) 



glass bead. The thorax is yellow, and so is the abdomen, with 

 the exception of a black tip. The wings are mostly brown, but 

 there is a broad yellow patch across the centre, and another, of 

 a similar colour, near the base. The lower wings are coloured 

 in a very similar manner, except that they are more translucent 

 than the upper pair. 



Another group now comes before us, namely, the Uroceridfr. 

 This word literally signifies "horn-tailed," and is given to the 

 insects because the ovipositor projects from the end of the 

 abdomen like a short stout horn. At first sight no organs 

 appear to be more unlike each other than the ovipositor of the 

 Uroceridse and that of the Saw Flies. A careful examination, 



