ENTOMOLOGY

COMMON FLIES AND HOW TO TELL THEM AP AR'r 149sharp tubercles on each side, and a median pair more remote from themargin (fig. SIc). The anal area is rather sunken with a small roundedtubercle at each outer corner. The stigmal plates are about one-halftheir diameter apart, each with three straight slits, directed somewhattowards each other, but also downward.jj Ih.IJ1a., IT, C.FIG. :n.-Larva of LuciUa 8ericata: a, dorsal view of head and prothorax; b, lateral viewof head and thorax; c, lateral view of last abdominal segments. (Greene.)This larva is mentioned on account of the adult which is very likelyto be met with. This larva is mostly injurious to sheep. Meinert hasreared another Lucilia (L. nobilia Mc:igen, of Europe) from larval takenfrom the ears of a sailor.FIG. 29.-Larva. of Ohry,omya macellaria: enlarged sketch of side of head and prothorax.(Greene.)Chrysomya macellaria FabriciusThe head from tbove is distinctly bilobed (fig. !9). There are twodistinct hooks. The anterior spiracles are very short, and contain onlyFIG. SO.-Larva of OhryBomya maceZlaria: enlarged SKetch of left stigmal plate. Theseplates are less than their breadth apart. (Greene.)7 lobes (fig. !9). The posterior upper part of segment 1 is swollen andwith many spines (fig. !9). E!ich of the foiIowing segments (except!)has a basal, swollen ring, armed with teeth pointing backward, the teethof the front rows are always larger. Beginning with segment 6 the under