. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. 286 Orthorrhapha brachycera. the disc is uniformly clothed with short hairs which may be more or less distinctly divided by two bare or \veai<:er haired stripes into dorsocentral and acrostichal hairs. One to three notopleural bristles and a poslalar bristle present, generally also a humeral, and some- times a posthumeral bristle. Sciitellum has two or fom- marginal bristles, in the first case the lateral bristles are represented by a small hair on each side. Metapleura without hairs. Abdomen con-
. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. 286 Orthorrhapha brachycera. the disc is uniformly clothed with short hairs which may be more or less distinctly divided by two bare or \veai<:er haired stripes into dorsocentral and acrostichal hairs. One to three notopleural bristles and a poslalar bristle present, generally also a humeral, and some- times a posthumeral bristle. Sciitellum has two or fom- marginal bristles, in the first case the lateral bristles are represented by a small hair on each side. Metapleura without hairs. Abdomen con- sists of eight segments, but in the male the eighth dorsal segment is hidden; the first segment is short, and weakly chitinised on the ventral side. The male genitalia are more or less knob-like; they consist of a large arched plale lying ventrally; on the left side there is a lamella-shaped piece, and above there is a pair of more com- plicated pieces, which are more or less hidden by the two other pieces; the lamella on the left side has a row of long, downwards hanging hairs at its lower margin. In the female the abdomen is pointed, the two last (seventh and eighth) segments are narrower than the others and form an ovipositor, terminating with two small styles; these two segments are generally of a duU grey colour in contrast to the other, black, shining segments. The legs are rather characteristic; they are strong, the front coxæ are very slightly longer than the posterior coxæ; the front femora are more or less thickened, and the middle femora still more; the middle tibiæ are shorter than the femora, and terminate on the ventral side with a strong, downwards curved apical spine; the front femora have two rows of fine bristles below; the middle femora have two rows of black, short, almost tubercle- shaped spines below, and outwards to them on the postero-ventral side a row of fine bristles; the middle tibiæ have a row of black spines Fig 131. , below, similar
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishercopenhagengecgad
