. Elementary entomology . FIG. 369. Rat-tailed maggot, larva of a syrphid fly similar to Fig. 368. (Twice natural size) (After Kellogg) among colonies of plant-lice, around which the flies may be seen hovering, and the maggots devour the aphides greedily, being among their most important natural enemies. Some of the larger species are thickly covered with yellow and black hairs, thus closely resembling bumble-bees, in whose nests their larvae reside. A common species which is often found on windows in fall is known as the drone-fly, from its close resemblance to a honey-bee drone. Its lar- va
. Elementary entomology . FIG. 369. Rat-tailed maggot, larva of a syrphid fly similar to Fig. 368. (Twice natural size) (After Kellogg) among colonies of plant-lice, around which the flies may be seen hovering, and the maggots devour the aphides greedily, being among their most important natural enemies. Some of the larger species are thickly covered with yellow and black hairs, thus closely resembling bumble-bees, in whose nests their larvae reside. A common species which is often found on windows in fall is known as the drone-fly, from its close resemblance to a honey-bee drone. Its lar- va lives in foul water and excrement, and is typical of a group which is often found in privies and similar filth. The larva is maggotlike in shape but has a long, extensile tube, through which it breathes, projecting from the tip of the abdomen to the surface of the food- material, which has given it the name of ' rat-tailed ; None of the family seems to be injurious, and those larvae which feed on plant-lice are exceed- ingly beneficial. Bot-flies (Oestridae). Another family in which the flies are well covered with hairs, so as to closely resemble bees, is that of the bot-flies, whose maggots are among the worst insect parasites FlG 3?0 A ( volucella erecta] of domestic animals. The adults which resembles a bumble-bee and is an have very rudimentary mouth- inquiline in bumble-bees' nests (after S. T. Hunter); and a typical syrphus-fly parts, so that they probably take (Syyhns rtbesii}
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