. Bulletin - United States National Museum. Science. 30 BULLETIN 67, UNITED STATES NATIONAL Fig. 59.—A robber-fly, Erax bas- tardii: a, Perfect insect; 6, pupa; LARVA SHOWN AT SIDE. and the legs are usually nearly smooth. The soldier-flies (Stratio- myiidae), which have many markings on the body, the horseflies (Tabanida?) (fig. 143), which annoy cattle as well as man, and the snipe-flies (Leptidae), with slender, tapering bodies, belong to this group. Their larvae are often aquatic, or live in moist situations. (b) The Tromoptera, or hovering flies, in which the empodium is bristle-l
. Bulletin - United States National Museum. Science. 30 BULLETIN 67, UNITED STATES NATIONAL Fig. 59.—A robber-fly, Erax bas- tardii: a, Perfect insect; 6, pupa; LARVA SHOWN AT SIDE. and the legs are usually nearly smooth. The soldier-flies (Stratio- myiidae), which have many markings on the body, the horseflies (Tabanida?) (fig. 143), which annoy cattle as well as man, and the snipe-flies (Leptidae), with slender, tapering bodies, belong to this group. Their larvae are often aquatic, or live in moist situations. (b) The Tromoptera, or hovering flies, in which the empodium is bristle-like, much more slender than the pulvilli, or else absent. The third joint of the antennae does not show any annu- lations. The legs usually have only fine hairs, and the body, especially the thorax, is often very hairy. The bee-flies (Bom- byliidse) (fig. 58), with pretty pictured wings, are in this group. Their larvae are often predaceous or parasitic, (c) The Ernegopoda, which have strong, bristly legs, and often large bristles on the thorax. The empodium is slender or absent, and the}7 are nearly all predaceous flies. The Asilida?, or robber-flies (fig. 59), are the largest of these insects, while the Empididae and Dolichopodidae embrace a host of smaller forms. (2) The AscMza have the antennae composed of three joints, with a tiny hair or arista near the tip. The head has no distinct lunule or arched suture near the base of the antennae. The pupae are coarctate. This includes the large family Syrpnidae (fig. 156), many of which are brightly and pret- tily colored, and the thick- headed flies or Conopidae, which have the abdomen nar- rowed at base. Many of the larvae of the Syrphids are predaceous and feed on plant- lice ; others occur in mud, in foul water, in ants' and wasps' nests, and in bulbs of plants. The larvae of Conops are para- sitic in wasps and bees. (3) The Scliizoplwra have the pupa coarctate, the larvae have no distinct head, and the antenna of the fly is o
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