758 EXPERIMENT STATION RECORD. [Vol.43 



por cent of end-worms occurred where the Bordeaux nozzle was used and 8.74, 

 3.09, and 1.89 per cent of end-worms with the disc nozzle. 



It is stated tliat the San Jos6 scale, which has been the most Important 

 nursery stocli pest in Missouri, has been practically eradicated from the nur- 

 series of the State, only two having been found infested during 1918-19. 



Seventeenth annual report of the State entomologist of Montana, R. A. 

 CooLEY {Montana Sta. Bui. 133 (1919), pp. 15, fig. i).— The first part of this 

 report consists of brief notes on the insect pests of 1919. This is followed by 

 brief discussions of the outstanding entomological problems of the present 

 time, in which the importance of the pale western cutworm (Porosagroiis 

 orthogonia Morr. ), grasshoppers, the sugar beet webworm, alfalfa weevil, foul 

 brood of bees, codling moth, leaf roller of the apple, and flea beetles are consid- 

 ered. It is deemed impossible at the time of writing to say whether the leaf 

 roller which appeared in injurious numbers on apple trees in the Bitter Root 

 Valley in 1919 was the fruit tree leaf roller (Archips argyrospila Walker) or 

 the oblique-bauded leaf roller (A. rosaceana Harris). 



Insect pests of field crops, L. Haseman {Missouri Sta. Bui. 170 {1920), pp. 

 39, figs. 37). — This is a reprint of Bulletin 134, previously noted (E. S. R., 33, 

 p. 555), in which a few sections have been revised. 



The chinch bug in Montana, J. R. Parker {Jour. Econ. Ent., IS {1920), 

 No. 3, pp. 318-322). — A report of observations of this pest in Montana, the first 

 record of the occuri'ence of which in that State was obtained on IMay 23, 1911. 

 The author's observations indicate that in Montana the chinch bug changes its 

 usual habit and hibernates as a well-advanced nymph. 



Watch for chinch bugs. — Method of constructing dust and tar barriers 

 in farm fields, H. A. Gossard {Mo. Bui. Ohio Sta., 5 {1920), No. 6, pp. 178, 

 179). — The author describes the construction of barriers for the prevention of 

 chinch bug migration and calls attention to the profitable use of crops immune 

 to their attacks. 



Generic classification of the hemipterous family Aphididae, A. C. Baker 

 ([/. S. Dept. Agr. Bui. 826 {1920), pp. 109, pis. 16, fig. i).— This, the first of a 

 series of papers treating of the Aphididre, deals with the c'.assification of the 

 genera. The phylogeny of the Aphididfe is first discussed in connection with a 

 diagram. A key is presented for the separation of the four subfamilies, Erioso- 

 matinse, Mindarinae, Hormaphidinse, and Aphidinje. The classification of these 

 subfamilies is then taken up, keys being presented, to the tribes, subtribes, and 

 genera. New genera erected include the following: Protrama, Neotrama, Ta- 

 malia, Neosymydobius, Patchia (represented by P. virginiana n. sp.), Neotho- 

 masia (n. n.), Sanbornia (represented by S. junipcri Pergande, n. sp.), Anomal- 

 aphis (represented by A. coniperei PergantTfe, n. sp.), Rhopalosiphoninus, and 

 Pachypappelia (n. n.). Reference is made to several genera not placed and an 

 index to the genera is included. 



The cotton or melon louse: Life history studies, F. B. Paddock {Texas 

 Sta. Bui. 257 {1919), pp. 7-5Jf, pis. k, fios. 3).— This is a detailed report of bio- 

 logical studies of the cotton or melon aphis commenced in March, 1916, much 

 of the data being presented in tabular form. 



" In Texas the normal form of reproduction is asexual throughout the entire 

 year. The alternate host plants in this State have not been determined. Fifty- 

 one generations completedtheir life cycle in a period of exactly 12 months. The 

 average reproduction period was 21.4 days, and the avei-age young produced 

 was 84.4. The migration tests indicate that the lice do not migrate from cotton 

 to the cucurbits or the reverse. Ants were found associated with the lice at all 

 times, but no definite relation was established. 



