The Anthrax 



from the nipple formed by the prothorax and 

 the head by a deep, narrow, curved fissure. 

 On its front surface are two pale-red stigmata, 

 or respiratory orifices, placed pretty close to- 

 gether. The metathorax, or last segment of 

 the thorax, is a little larger still in diameter 

 and protrudes. These abrupt increases in cir- 

 cumference result in a marked hump, sloping 

 sharply towards the front. The nipple of 

 which the head forms part is set at the bottom 

 of this hump. 



After the metathorax, the shape becomes 

 regular and cylindrical, while decreasing 

 slightly in girth in the last two or three seg- 

 ments. Close to the line of separation of the 

 last two rings, I am able to distinguish, not 

 without difficulty, two very small stigmata, 

 just a little darker in colour. They belong to 

 the last segment. In all, four respiratory 

 orifices, two in front and two behind, as is the 

 rule among Flies. The length of the full- 

 sized larva is 15 to 20 millimetres 1 and its 

 breadth 5 to 6. 2 



Remarkable in the first place by the pro- 

 tuberance of its thorax and the smallness of 

 its head, the grub of the Anthrax acquires ex- 



1 .$i to .78 inch. — Translator's Note. 

 2 .i9 to .23 inch. — Translator's Note, 



33 



