ECONOMIC ZOOLOGY ENTOMOLOGY. 251 



The role of Collembola in economic entomology, W. E. Collinge {Jour. 

 Econ. Biol, .', (WOO), A'o. 3, pi). SS-86, fig. 1).—It is concluded that probably all 

 Collembola are more or less injurious to plant life. A list is given of 13 species 

 which are distinctly injurious. 



On the presence of a flagellate parasite in the latex of Euphorbia pilulif era, 

 A. Lafont (Coinpt. Rend. t:yOc. Biol. [Paris]. 66 (1909), No. 22, pp. 1011- 

 1013). — The author reports the discovery of a flasjellate in the latex of E. 

 piluJifcra on the Island of Mauritius. This parasite presents all the characteris- 

 tics of the genus Leptomonas (Herpetomonas in the sense of certain authors) 

 and is given the name Leptomonas davidi. The plants examined have varied in 

 infestation from none to immense numbers. The parasitized plant loses its 

 leaves and growth is retarded. Of 144 individual plants collected from different 

 parts of the island, 4!) were parasitized. The sap of 21 additional species of 

 plants was examined without finding the parasite. 



Herpetomonas aspongopi, W. M. Adkrs {I'arasitologii, 2 {1909), Ao. 3, pp. 

 202-207, figs. 2). — Tlie author has found //. ospongopi to be a true parasite of 

 the melon bug {Aspongopu.s viduatus) at Khartoum. The complete life cycle of 

 development takes place in the alimentary tract of the bug. The parasite is not 

 transmitted hereditarily but is probably conveyed from host to host by the 

 ingestion of feces containing resting forms. 



Note on two new flagellate parasites in fleas, Doris L. Mackixnon {Ptira- 

 sitologg, 2 {1909), Xo. 3, pp. 228-296, pi. 1). — Herpetomonas ctenophthahni and 

 Critliidia hystrichopxylhc are described as new. 



Report of the entomologist, T. .1. IIkadi.ee {Kansas ^la. Rpt. 1908, pp. 

 XL] 11-LIIl). — The noxious insects and rodents mentioned include the Hes- 

 sian fly, corn ear-worm, chinch bug, greater wheat straw worm, green bug, 

 fall army worm, fall wobworm, olm twig girdlor, ])ocket gopher, and prairie 

 dogs. 



In cooperation with the lUireau of Entomology of this Department, a study 

 of the Hessian fly was made in Sumner County. It wiis found that in May 

 many of the flaxsee;ls formed in the spring gave up adult flies that laid eggs 

 upon young plants sprouting up from the bases of the older plants. Biological 

 studies as related to the control of the pest are now under way. 



A careful study of the green bug and its parasitic enemies both in the field 

 and laboratory was carried on. The rate of reproduction of the green bug at 

 different tem])eratures and its ability to withstand low temperatures as well as 

 the rate of rei)roduction of the principal ])ara sites under different temperatures 

 and the effect of low temperature on its mortality are said to have been deter- 

 mined, "The present state of the work would indicate the parasite LgsipJilchus 

 tritici to be, under proper conditions of temperature, a most effective check on 

 the green bug; that it can survive lower temperature than the green bug; that 

 it can use several common species of plant lice as hosts, and is therefore 

 unlikely to be totally absent from any locality in this State where the green 

 bugs are present in damaging numbers; that the destruction of volunteer wheat 

 and oats, thus depriving the green bug of some of its common summer food 

 plants, would help to prevent it from infesting the regular crop; and that 

 plowing under spots of seriously infested wheat is effective in preventing 

 further spread from those spots." 



Insects of the year, H. T. Fernald {Massachusetts Sta. Rpt. 1908, pt. 1, pp. 

 7J-77). — In this brief report mention is made of the San Jose scale, elm-leaf 

 beetle, green-striped maple-worm, brown-tail moth, etc, Heterocampa gutti- 

 vitta, previously noted as occurring in Maine and New Hampshire (E, S, R., 

 21, p. 759) appeared in forest areas in the western part of the State. The 

 oriental moth has continued to spread but has not thus far shown any indica- 



