BLOOD-SUCKING INSECTS AND TROPICAL DISEASES. 175 



Entomological forceps (two pairs), with curved ends for holding 

 pins (from G. Buck, 242, Tottenham Court Boad, London, W.). 



Fig. 12. 

 Entomological 



Forceps. 



Fine-pointed forceps (one or two pairs) : these are useful for arranging the 

 legs and wings of specimens when pinned ; they can be obtained with 

 the above. 



Needles (two or three) mounted in handles, — also for arranging leg? and wings. 



Entomological pins (D P. Tayler & Co., New Hall Works, Birmingham) 

 Nos. 5 (Is. &d. per ounce), 7 (2s. 6d, per ounce) and 20 (7s. Qd. per ounce). The 

 No. 20 pin should be used for all but the very largest Diptera, such as Horse- 

 flies (Tabanida3) ; as it is exceedingly fine, an ounce will go a very long way. 



Commonpins — a thousand or two, in paper packets. 



Gun-wad punches, Nos. 4, 12, and 20 bores (from any gun-makers), for 

 punching discs of card. 



Cards (3 sheet Bristol board), from which to punch discs ; a supply of the 

 latter should be prepared ready for use. 



A platyscopic lens (Messrs. Baker, 244, High Holborn, London, W. C; or 

 John Browning, 63, Strand, London, W. 0. : price about 15s ). The magnify- 

 ing-power should not be too high — from 10 to 15 diameters is about the 

 best. 



Cork-carpet or pith. — Two or three sheets about 6 inches square, on which 

 to perform the operations of pinning, etc. (Cork-carpet can be obtained at 

 Harrod's Stores, Brompton Road, London, S. W.) 



Two or three cork-lined entomological store-boxes. — These can be obtained from 

 Messrs. Watkins & Doncaster, or any other dealer in natural history apparatus. 

 For a collecting trip or expedition of some duration the boxes should not be 

 smaller than about 18 inches by 12, and they must be sufficiently deep to 

 prevent the heads of the pins from coming into contact when both sides of 

 the box are filled. Should the collector run out of store-boxes, cigar-boxes in 

 the bottom of which is fixed a layer of cork-carpet or pith, make efficient sub- 

 stitutes ; but if pith is used, it should not be less than + inch thick. 



Alcohol, 90 per cent, (ordinary rectified spirit). 



Perchloride of mercury, aqueous solution, 1 in 500. 



Method of Collecting. 



If possible, Diptera should always be brought home alive in the glass- 

 bottomed pi 1-boxes (to which they are to be transferred on being captured in 

 the net), and should then be killed in the cyanide-bott le or jar immediately 

 before being pinned. As soon as a fly is taken in the cet by a dexterous 



