. Bulletin - United States National Museum. Science. COLLECTING AND PRESERVING TNSECTS—BANKS. 91 carefully watching the collector may obtain some of the parasitic species. Ants (fig. 159) can be secured anywhere, but it is better to get at the nests and so secure the different forms at one time. All the specimens from one nest should bear a number, as "Nest ; They may be collected in alcohol and mounted up as desired. The social wasps and bumblebees may be gathered from the nests by visiting them at nightfall and introducing chloroform, or carbon bisulphide for those in the ground
. Bulletin - United States National Museum. Science. COLLECTING AND PRESERVING TNSECTS—BANKS. 91 carefully watching the collector may obtain some of the parasitic species. Ants (fig. 159) can be secured anywhere, but it is better to get at the nests and so secure the different forms at one time. All the specimens from one nest should bear a number, as "Nest ; They may be collected in alcohol and mounted up as desired. The social wasps and bumblebees may be gathered from the nests by visiting them at nightfall and introducing chloroform, or carbon bisulphide for those in the ground. One may thus gather all the dif- ferent forms, which are not as yet known for many of our species of these insects. The Micro-Ilymenoptera are sometimes collected in alcohol, espe- cially those obtained in sifting. These can be prepared for mounting, Mr. Crawford says, by removing them from the alcohol and placing. Fig. 140.—A fossorial wasp, Ammopiiila nigricans. them in chloroform for a few minutes, and then out on blotting paper. In many cases the genitalia of Hymenoptera are of value in deter- mining the species. If the specimen is gently squeezed near the tip of the body the genitalia will sometimes be extruded. Other- wise they will have to be removed with a pair of fine scissors and scalpel and mounted on a slide or on a bit of cardboard attached to the pin. The nests and galls of Hymenoptera should be collected whenever possible. The galls may be pinned in the boxes, but a better way is to put them in flat pasteboard boxes of a size suitable to be arranged in rows in the box or drawer, with a label on the upper edge of each box indicating the contents. Casts of holes may be obtained by pouring into them mixtures of cement or plaster of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Uni
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