. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 10 Orthorrhapha Fig. '2. L. cylindrica, hind lesf. X20. five posterior cells and the anal cell open. Alula not developed. Alar squamula small. I have not examined the larva and pupa but they are described by Beling (Arch, fiir Natgesch. Jahrgang 41, 41 et Jahrg. 48, 195); the larva has a length up to 13 mm. with a diameter of 2 mm.; it is cylindrical, white, finely striated longitudi- nally. Head small, brown, retractile, with some long hairs. A transverse row of small warts (Kriechschwielen), on the
. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 10 Orthorrhapha Fig. '2. L. cylindrica, hind lesf. X20. five posterior cells and the anal cell open. Alula not developed. Alar squamula small. I have not examined the larva and pupa but they are described by Beling (Arch, fiir Natgesch. Jahrgang 41, 41 et Jahrg. 48, 195); the larva has a length up to 13 mm. with a diameter of 2 mm.; it is cylindrical, white, finely striated longitudi- nally. Head small, brown, retractile, with some long hairs. A transverse row of small warts (Kriechschwielen), on the ventral side of the sixth to the eleventh segment. The larva is amphipneustic with spiracles on prothorax and on the penultimate segment (or the marked off front part of the last segment); the spiracles are small. The pupa is 6 mm. long, 2 mm. thick, yellowish white. The strongly diverging antennal sheaths lie on the under side of the head. Each of the first seven abdominal segments has on the dorsal side a row of six to eight brown spines directed backwards, and moreover the segments are all round, beset with erect, thin, brownish hairs, which are most dense towards the apex of the body. The wing-sheaths reach to the hind margin of the second and the sheaths of the legs to the hind margin of the fifth abdominal segment. The larvae live in the earth; they are found both in loamy soil on fields and in humous earth; they hibernate and the transformation to pupa and development of the imago take place in spring or summer. The species of Leptogaster have a characteristic appearance from their long slender shape and the short wings; they occur both on open fields and in thickets as also on commons near the shore; they fly very dexterously in the high grass and herbage; when sitting the hind legs are generally stretched somewhat forwards so that all six tarsi are placed near to each other. I have never observed any Leptogaster with prey. Zeller (Isis 1840, 34) mentions that he finds
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
