. Diptera Nematocera (excluding Chironomidæ and Culicidæ). Diptera. 32 INTRODUCTION. must always be left safficieiit space below the insect for at least two or, perhaps, three labels, aud room agaia after that for the forceps to grasp the pin.* In pinning small and very minute Diptera with the short, very tine pins, they are best pinned when lying on the left side, the pin passing throngh the thorax just below the dorsum, and at such an inclined angle that it emerges trom the lower (left) side just above the ; By thus piercing the thorax obliquely, it is possible, by slanting the pi
. Diptera Nematocera (excluding Chironomidæ and Culicidæ). Diptera. 32 INTRODUCTION. must always be left safficieiit space below the insect for at least two or, perhaps, three labels, aud room agaia after that for the forceps to grasp the pin.* In pinning small and very minute Diptera with the short, very tine pins, they are best pinned when lying on the left side, the pin passing throngh the thorax just below the dorsum, and at such an inclined angle that it emerges trom the lower (left) side just above the ; By thus piercing the thorax obliquely, it is possible, by slanting the pin slightly when mounting it on pith or. Fig. r».—Method of mounting (a) a moderate-sized fly, (i';) a very small fly. ctn-k, to enable the student to examine both the dorsum and the right side of the insect without removing it from the cabinet. These minute pins should carry tlie specimens as near their heads as possible, and be stuck in neatly-cut, oblong pieces of white pith or similarly shaped pieces of cork covered \\'it\\ white paper. These pieces of pith should be broad and long enough to protect the head aud legs to a moderate extent, but no broader, otherwise it is impossible to place a strong hand-lens near enough to examine details. Moreover the pith should invariably be of some depth, as this secures a tighter grasp of the large pin which must be thrust through the end of the pith opposite that bearing the A dot of white gum placed on the upper side of the pith on the spot where the small fine pin is inserted will fix it securely and a larger drop of gum should be placed around the strong pin where it emerges from the under side of the pith. Some collectors, however. * In removing a delicate specimen from the cabinet the forceps should grasp the pin above the insect; in replacing it, the forceps should grasp the pin below the insect, thus in each case minimising the chances of accident. t When fixing the small pin in the pith the head of the insect mu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdiptera, bookyear1912
