CALCIUM CARBONATE IN DIPTEROUS LARVAE 6138 
TExtT-FIG. 1. 
Myiatropa florea, dissection of a full-grown larva. a.m.,anterior 
pair of Malpighian tubes; «a.s., anterior spiracles; c.p., cal- 
careous or terminal portion of the Malpighian tubes; h.g., hind- 
gut; i., mid-gut; 7.c., intestinal caeca; x., central nervous 
system; ¢., oesophagus; p., pharynx; p.m., posterior pair 
of Malpighian tubes ; s., salivary glands; ¢7., tracheal trunks. 
