. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. Iiitiodutlion. 7 it may also be horizontal and ratlier large, as f. inst. in tlie Tipulidæ and Xylophagidæ, especially Xylophagus. The thorax is thus chiefly formad of niesotliorax, the protliorax is very small and also the metathorax; of the latter may sometimes be seen a narrow part behind the postscutellum and between the balteres; on the ventral side sometimes a narrow metathoracic part may also be distinguished. The spiracles I take to be prothoracic and mesothoraeic. Abdomen consists of a number
. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. Iiitiodutlion. 7 it may also be horizontal and ratlier large, as f. inst. in tlie Tipulidæ and Xylophagidæ, especially Xylophagus. The thorax is thus chiefly formad of niesotliorax, the protliorax is very small and also the metathorax; of the latter may sometimes be seen a narrow part behind the postscutellum and between the balteres; on the ventral side sometimes a narrow metathoracic part may also be distinguished. The spiracles I take to be prothoracic and mesothoraeic. Abdomen consists of a number of segments of which the last ara generally more or less transformed; in the descriptions I give the number of not transformed segments; these are as a rule not difficuit to see but sometimes one or more of the last may be small or the last may be more or less hidden. Also at the base of the abdomen the first segment may be narrow, and sometimes the first and second ventral segments may be coalesced, yet generally a suture marks the line of connexion. The legs are somewhat uniform, only they may be relatively short or on the contrary relatively long, and they may be stronger or weaker. Generally the somewhat sluggish and not well flying Diptera have much stronger legs than those that fly well; the species with somewhat strong legs often bear bristles on them. The tarsi are five-jointed; the last joint bears a pair of claws which are ^.^^ j lateral vie^v of thorax of generally smiple, but sometimes may be Dryomyza anilis. serrated or otherwise specially formed. Besides the claws there are at the end of the last joint still three organs, which may be of some systematic importance: under the claws are attached two lobes, the pulvilli, these are generally organs of fastening; they may be of diflferent, sometimes complicated, forms, and of different sizes, and sometimes they may be absent. Between the pulvilli is inserted a median organ, the empodium ; this may also be very diffe
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