ENTOMOLOGY

COMMON FLIES AND HOW TO TELL THEM APART 147are nearly in a transverse row. The rounded tip of the body (fig. ~5c)shows, across the middle, faint traces of four low cones. The stigmalplates (fig. ~6) are scarcely elevated, black, less than their own diameterapart, and each with three very short slits pointing towards those of theopposite plate. .This larva is common in decaying vegetable matter; and has beenreared from rotten apples, pears, squash, mushrooms and dead insect,FlO. 25.-Larva of MtI8cina ,tabulallll: a, Side view of head and prothorax; b, an·terior or thoracic spiracles; c, side view of terminal segments of abdomen.(Greene.)Iarvre. In one case a considerable number were passed by a child suf·fering with summer complaint. Laboulbene records larvre of this speciesvomited by a person suffering from bronchitis.FlO. i6.-Larva of MtI8cina ,tabula1lB: enlarged sketch of ri~ht stigmal plate. Theseplates are less than their breadth apart. (Greene.)Calliphora erythrocephaZa Meigen'rhe head of this larva is distinctly divided into two parts from above(fig. ~7, side view of head) ; each part or lobe has a tiny papilla. Thereare two well separated mouth hooks. The anterior spiracles have fromniw! to twelve lobes. Beginning with the third, each segment shows anapical swollen ring or girdle, whose surface is scabrous (roughened likea file); these rings are broader below than above, and are here notchedon the posterior middle. Each ventral segment, beginning with the fifth,is divided by a transverse groove near the middle. The anal area showsa smooth median process, divided in the middle, and at each outer corneris a cone. The stigmal field is rather concave, the upper lip with threesmall tubercles on each side, the lower lip with two larger tubercles oneach side, and a median pair smaller and lower down. The stigmalplates are about once and a fourth their diameter apart, each with three