. Smithsonian miscellaneous collections. nner end, ordinarily collapsed into the cup, is an elastic diskon which is attached the second pair of dilator muscles (7). Thesemuscles by contraction pull out the disk, which, on relaxation of themuscles, snaps back by its own elasticity. The action is easily demon-strated on a dead specimen. The blood evidently is sucked out ofthe cibarial pump and driven on into the oesophagus. SNIPE FLIES. FAMILY RHAGIONIDAE The family of the snipe flies has been more commonly known asLeptidae. At least two genera include biting and bloodsucking species ;one is Sym
. Smithsonian miscellaneous collections. nner end, ordinarily collapsed into the cup, is an elastic diskon which is attached the second pair of dilator muscles (7). Thesemuscles by contraction pull out the disk, which, on relaxation of themuscles, snaps back by its own elasticity. The action is easily demon-strated on a dead specimen. The blood evidently is sucked out ofthe cibarial pump and driven on into the oesophagus. SNIPE FLIES. FAMILY RHAGIONIDAE The family of the snipe flies has been more commonly known asLeptidae. At least two genera include biting and bloodsucking species ;one is Symphoromyia Frauenfeld with several species in the westernparts of the United States, the other is Spaniopsis White ofAustralia. no. 7 BITING AND SUCKING INSECTS—SNODGRASS 65 Symphoromyia atripes Bigot, here illustrated (fig. 26 A), is some-what smaller than a house fly. The head is set on the front of thethorax as in the horse flies, instead of hanging below it as in mostof the biting Nematocera. On the face (B) the large clypeus (Clp). Fig. 26.—A snipe fly, Symphoromyia atripes Bigot, female, head and mouthparts. Order Diptera, family Rhagionidae. A, female fly (length mm.). B, head and proboscis, anterior. C, man-dible. D, labrum, anterior. E, maxilla. F, hypopharynx, floor of cibarialpump, and salivary pump with its muscles (18), posterior. at, anterior tentorial pit; CbP, cibarial pump; Clp, clypeus; clp, medianlobe of clypeus; Fr, frons; Hphy, hypopharynx; Lb, labium; Lm, labrum;sc, salivary canal; SIP, salivary pump; y, cornu of cibarial pump. is distinctly defined, and in its lower part a small median lobe (Clp)supporting the labrum is set off by a pair of lateral grooves. Thefrons is represented by wide lateral areas between the eyes and theclypeus, but it is almost obliterated between the antennae by theupward encroachment of the clypeus. The piercing and suckingorgans, as shown in the figure (C, D, E, F), resemble those of the 66 SMITHSONIAN MISCELLANEOUS COLLE
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
