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MISC. PUB. 601, U. S. DEPT. OF AGRICULTURE 



DOUBLE MOUNTS 



Small insects which cannot be pinned directly through the body 

 with regular insect pins should be mounted on card points or on 

 "minuten nadeln." 



Card points are slender triangles of paper. These are pinned 

 through the broad end with a regular insect pin (No. 2 or 3), and the 

 specimen is glued to the point, as illustrated in figure 11, A. The card 

 points should be pinned at the height obtained by using the highest 

 step on the pinning block (fig. 10). Card points may be cut with 

 scissors from a strip of paper three-eighths inch wide, but a punch, 



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Figure 11. — Double mounts for small insects : A, Position of card point and labels 

 on the pin ; B, details of attachment of specimen to card point ; C, small moth, 

 order Lepidoptera, pinned with a "minute nadel" to a block of pith on a 

 regular insect pin ; D, a mosquito, order Diptera, pinned with a "minute 

 nadel" to a block of cork on a regular insect pin ; E, method of attaching an 

 inflated larva to a regular insect pin by twisting fine wire around a block of 

 cork. 



obtainable from supply houses, makes better and more uniform points. 

 A good-quality linen ledger paper should be used ; "substance 36" is 

 recommended. To fasten the specimen to the point ordinary glue 

 may be used, but it is not recommended because it tends to become 

 brittle. Some of the clear acetate cellulose cements, such as "Ambroid," 

 which may be purchased in small quantities at variety stores, are 

 satisfactory. An adequate supply may be made by dissolving a trans- 

 parent resin toothbrush handle in a small amount of banana oil (amyl 

 acetate). Pure white shellac is also fairly satisfactory but may be 

 difficult to obtain. Whatever adhesive is used, it should not be per- 



