NOTES AND ABSTEACTS. 



799 



scribing their modes of attack, life histories, and the means of pre- 

 venting their scourges. — G. T. D. 



Insects, Friendly. By W. W. Froggatt {Agr. Gaz. N.S.W. 



April 1910, pp. 335-346; 2 plates, 15 figs.)— The hfe-history of the 

 friendly insects is described, with illustrations, viz. : the ladybirds, 

 green lace wing (Chrysopa ramhurii), brown lace wing {Micromis 

 australis), hover fly [Psylopus sydneyensis), the golden-faced fly 

 (Sarcofhaga aurifrons), ichneumon flies, braconid wasps (Ephedrus 

 persicae), chalcid wasps, vine moth bug (Oechalia schellembergi), and 

 the mantis. — S. E. W. 



Insects of Field Crops. By E. H. Pettitt {U.S.A. Exp. Sta. 

 Michigan, Entom. Bull. 258, Feb. 1910; 51 figs.).— The present 

 bulletin is the third of a series dealing with the insects affecting 

 different classes of crops. It deals with the insects of field crops in 

 Michigan, and gives preventive and remedial measures. 



The insects described are those which attack wheat, clover, beans, 

 peas, grain, seeds, &c., and the excellent illustrations should be of 

 great assistance to the agriculturist.— F. G. J. 



Irrigation in Colorado. By 0. W. Beach and P. J. Preston 

 {U.S.A. Dep. Agr. Off. Exp. St., Bull. 218, 1910.— The advantages 

 of farming under irrigation are described by the writer, and the number 

 of crops that could not otherwise be cultivated are successfully grown 

 under this method of treatment are pointed out. Estimates of esta- 

 blishing a good irrigated fruit farm are given — useful information to 

 those who contemplate fruit farming in Colorado.-— A. D. W. 



Iris Clarkei {Bot. Mag. tab. 8323). — Nat. ord. Iridaceae; tribe 

 Irideae. Sikkim. Herb, 3 feet high; leaves 10-24 inches long; 

 perianth, purple-violet, variegated, 3 inches across; style arms and crest 

 blue.— G. H. 



Iris Hybrids. By G. T. Grignan {Rev. Hort., March 1, 1910, 

 pp. 180-9; col. plate). — The plate represents Iris Monspur, purple, 

 Iris Monnieri x Iris spuria, of which names that of the hybrid is a 

 combination-; and Iris ochraurea, pale yellow standards, named on same 

 principle from its parents, I. ocliroleuca x I. aurea; both robust and 

 good.— C. T. T). 



Iris ting'itana. By W. Fitzherbert {Garden, July 16, 1910, 

 p. 350). — ^Mr. Elwes, referring to the cultivation of rare foreign plants, 

 once remarked that in this country they require rich soil in order to make 

 up for the change in temperature, and he gave as an instance this Iris, 

 which grows in sand near Tangiers, but can only be kept in health here 

 by rich food. The writer having grown this Iris for some years without 

 flowering it, altered his method. He placed a layer of manure eight 

 inches below the surface, the upper soil being mixed with equal parts 



