THE SUGAR-BEET THKIPS. 11 
The spray should be applied to both sides of the leaves; if possible, 
on a dull or cloudy day. The adults are not so active at this time 
and are, therefore, less likely to move out of reach of the spray. 
BIBLIOGRAPHY. 
(1) Reuter, 0. M. 
1891. Thysanoptera, funna i finska orangerier. In Meddel. af Societatis pro 
Fauna et Flora Fennica, v. 17, p. 161-167. 
Original description of the female as Heliothrips femoralis n. sp., p. 166. 
(2) Pergande, Theo. 
1895. Observations on certain Thripidae. In U. S. Dept. Agr. Div. Ent. 
Insect Life, v. 7, no. 5, p. 390-395, July. 
Description of the female as Heliothrips cestri n. sp., and notes of its habits, with food plants, 
p. 391. 
(3) Uzel, Heinrich. 
1895. Monographic der Ordnung- Thysanoptera. Koniggratz, 427 p. 10 pi. 
Description. 
(4) Bergroth, E. 
1896. Nouvelle espece de Thysanoptcres. In Ann. Soc. Ent. Belg., v. 40, 
p. 66-67. 
Description, p. 67. 
(5) Reuter, O. M. 
1899. Thysanoptera fennica. Forteckning och beskrifning ofver finska 
Thysanoptera. In Acta Soc. pro Fauna et Flora Fennica, v. 17, no. 
2. 67 [2] p. illus. 
Description and list of food plants, p. 39. 
(6) Hinds, W. E. 
1902. Contribution to a monograph of the insects of the order Thysanoptera 
inhabiting North America. In Proc. U. S. Nat. Mus., v. 26, p. 79-242. 
11 pi. 
Description of female, with list of its food plants, p. 172-173, PL V, rigs. 55, 56, PL VI, fig. 57. 
(7) Chittenden, F. H. 
1902. Thrips injurious in greenhouses. In Weekly Florists' Review, v. 9, p. 
738-740, 2 figs. April 17. 
General description of Heliothrips cestri, a list of food plants, and methods of control. 
(8) BUFFA, PlETRO. 
1907. Trentuna specie di tisanotteri italiani. Pisa. 77[2] p. 2 pi. Separate 
from Atti Soc. Tosc. Sci. Nat. Mem. 23, p. 226-303. 2 pi. 
Description, p. 63. 
(9) Bagnall, R. S. 
1908. Notes on some genera and species of Thysanoptera new to the British 
fauna. In Ent. Mo. Mag. ser. 2, v. 19 (whole ser. v. 44), no. 1, p. 3-9. 
Jan. 
Records its occurrence in trchid houses at Wylam-on-Thyme, Northumberland. (Footnote) 
Note on its occurrence in Antwerp and Brussels in large numbers, p. 6, 7 (footnote). 
(10) BUFFA, PlETRO. 
1908. Contribuzione alia conoscenza dei Tisanotteri italiani. In Redia, v. 5, 
p. 133-137. 
Record of occurrence in Italy, p. 135. 
(11) Bagnall, R. S. 
1909. A contribution to our knowledge of the British Thysanoptera (Tere- 
brantia), with notes on injurious species. In Jour. Econ. Biol,, v. 4, 
no. 2, p. 33-41. July 7. 
Not uncommon in a hothouse on a large variety of plants, Kew Gardens and New Castle, 
p. 39. 
