90 
BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
751. Forbes, S. A. Thrips or strawberry “midget.” (Thrips tritici 
Fitch.) <Centralia, Ill., Sentinel, 1887. Reprint: <Prairie 
Farmer, 4 June, 1887. 
The various species of Thrips, list of plants on which tritici is abundant; 
injuries hy various species mentioned, with description of habits and 
points in life history. Warm dry weather said to favor their multipli¬ 
cation. 
752. Forbes, S. A. Relations of ants and aphids. <Amer. Rat., June, 
1887, v. 21, p. 579, 580. 
Eggs of Aphis maidis in nests of Lasius alienus. 
753. Forbes, S. A. Chinch bugs in Illinois. <Prairie Farmer, 6 
August, 1887. 
Letter to the Secretary of the State Department of Agriculture, outlining 
the imminent danger of an outbreak of Blissus leucopterus in northern 
Illinois in 1888 and noting the adaption of the present weather in central 
Illinois to its development. 
754. Forbes, S. A. On the chinch bug (Blissus leucopterus Say) in 
Illinois. Present condition and prospects for 1887 and 1888. 
Remedial procedure recommended. <Bull. Ro. 2, Office of 
State Entomologist Illinois, 1887. <Trans. Dept. Agric. 
State of Illinois for 1886, 1887, v. 23, pp. 89-103. Separate: 
<Springfield, Ill., 1889, pp. 89-103. See: <Review Dispatch, 
23 September, 1887. <Fruit Growers’ Journ., 1887; 1 Octo¬ 
ber; 15 October. <Prairie Farmer, 8 October, 1887. 
755. Forbes, S. A. Contribution to a knowledge of the life history of 
the Hessian fly. (Cecidomyia destructor Say.) <Bull. Ro. 3, 
Office of State Entomologist Illinois, 1887. <Trans. Dept. 
Agric. State of Illinois for 1886, 1887, v. 23, pp. 21-34. Sepa¬ 
rate: <Springfleld, Ill., 1889, pp. 21-34. See: <Prairie 
Farmer, 5 Rovember, 1887. <Farm and Fireside, 6 February, 
1888. 
Advance sheets from 15th Report State Entomologist of Illinois. 
756. Forbes, S. A. Unsolved problems in horticultural entomology. 
<Trans. Ill. State Hortic. Soc. for 1887, 1887, new ser., v. 21, 
pp. 92-97. 
Relates to Aphis mali, Trypeta pomonella, Conotrachelus nenuphar, with brief 
inquiries as to muckworms, red spider, grape Phytoptus, and borers in 
fruit trees. 
757. Forbes, S. A. On some contagious diseases of insects. <Proc. 
Amer. Assoc. Adv. Sci., for 1886, 1887, v. 35, p. 268. 
A germ disease of Pieris rapce, transferred to Pyrameis cardui; pehrine from 
silkworm to other insects; notice of disease of larva of Nephelodes violans. 
758. Forbes, S. A. The chinch bug. <Freeport Journ., 15 February, 
1888. 
Abstract of paper read at a farmers’ institute. Chinch hugs said to be 
present in northern Illinois in sufficient numbers to threaten an outbreak 
the following season. Economic recommendations. 
