COMMON FLIES AND HOW TO TELL THEM APART 149 



sharp tubercles on each side, and a median pair more remote from the 

 margin (fig. 31c). The anal area is rather sunken with a small rounded 

 tubercle at each outer corner. The stigmal plates are about one-half 

 their diameter apart, each with three straight slits, directed somewhat 

 towards each other, but also downward. 



a.. t-, C. 



Fig. 31. — Larva of ImciUa sericata: a, dorsal view of head and prothorax; b, lateral view 

 of head and thorax; c, lateral view of last abdominal segments. (Greene.) 



This larva is mentioned on account of the adult which is very likely 

 to be met with. This larva is mostly injurious to sheep. Meinert has 

 reared another Lucilia (L. nobilis Meigen, of Europe) from larvse taken 

 from the ears of a sailor. 



Fig. 39. — ^Larva of Chrysomya macellaria: enlarged sketch of side of head and pro- 

 thorax. (Greene.) 



Chrysomya macellaria Fabricius 



The head from above is distinctly bilobed (fig. 29). There are two 

 distinct hooks. The anterior spiracles are very short, and contain only 



Fig. 30. — ^Larva of Chrysomya maeellaria: enlarged sKetch of left stigmal plate. These 

 plates are less than their breadth apart. (Greene.) 



7 lobes (fig. 29). The posterior upper part of segment 1 is swollen and 

 with many spines (fig. 29). Each of the following segments (except 2) 

 has a basal, swollen ring, armed with teeth pointing backward, the teeth 

 of the front rows are always larger. Beginning with segment 6 the under 



