458 EXPERIMENT STATION RECORD. 



while others are parasitic on injuriuus insects. The group is, therefore, of 

 considerable economic iiu|)ortance. 



.Analytical tables are presented to assist in the identification of genera and 

 species, and all species known to occur in the ITnited States are described. .V 

 number of these are described as new. 



The wing veins of insects, C. W. Woodwortii {Univ. Cal. Pubs.. Ent.. 1 

 (1906), Xo. J, pp. 152. figs. 101). — The views which have prevailed regarding 

 the origin and homology of insect wings have been greatly at variance, and the 

 author therefore undertook a comparative study of this problem for the pur- 

 pose of presenting, if possible, a more satisfactory system of classification. 

 The development of the wings and veins was given careful attention, and the 

 origin and position of the veins are discussed for each order of insects. The 

 author's views are comjiared with those of other investigators, and a bibliog- 

 raphy of the subject is appended to the bulletin. 



The conclusions reached from this study are that the wings are developed 

 purely as a means of flight and that the dominant factors in their development 

 are mechanical necessities. These factors determine the location of the wings 

 and of the veins, the position of the latter being quite different in different 

 orders of insects. It is believed, therefore, that it is nut i)ossiI)le to maintain 

 a strict homology in any wing vein throughout the whole series ol insects. The 

 author proposes, nevertheless, to use general terms for these veins in a some- 

 what elastic manner, recognizing the fact that veins of the same name may not 

 ))e strictly homologous. 



Introduction of parasites, C. Harper (-Jour. Dcpt. Ayr. West. An St.. IJf 

 (1906), No. 3, pp. 175-118). — A controversy having arisen regarding the desira- 

 bility of expending money in the collection of parasites, the advisory board of 

 the department of agriculture of Western Australia investigated the matter 

 and reports that, in their opinion, the evidence thus far accumulated is in favor 

 of putting forth a reasonable amount of effort to secure all possible parasites 

 of the more important injurious insects. 



Some flagellate forms found in the intestinal tracts of diptera and other 

 genera, A. Lingard and E. Jennings (London: Adhird d- Son. 1906. i)p. .2-5. 

 pis. ■')). — A microscopical examination was made of the intestinal contents of 

 the common house tiy. Sto))io,vi)s calcttrans. mosquitoes, and other insects. In 

 this study particular attention was given to the morphology of the flagellate 

 organisms found in the intestines of files and upon the influence of the food 

 which they received upon the number and character of these organisms. 



The breeding habits of the tsetse fly, E. A. Minchin {Nature [London]. 

 77/ (1906). No. 1930, p. 636).— The author quotes from the letter of A. G. Bag- 

 shawe a statement that the latter has succeeded in finding the pupie of tsetse 

 flies in the soil about the roots of bananas in a lai'ge plantation. 



Observations indicate that the adults can fly to a distance of 1 mile fi'om the 

 place where they originate. 



The extirpation of the tsetse fly, E. A. Minchin (Nature [London]. 7,> 

 (1906), No. 1932, p. 30). — The presence of the tsetse fly in considerable num- 

 bers was noted in a locality where banana plantations wei'e supjiosed not to 

 exist. Later such plantations weiv found, and the author suggests that if the 

 tsetse fly breeds only in banana plantations it might be practicable to combat 

 them by introducing jungle fowl and other birds which would feed upon them 

 in such places. 



Analyses of Paris green, J. P. Street {New Jersey Stas. Bui. 195, pp. 12). — 

 A copy is given of the law of New Jersey regulating the sale of Paris green. 

 In accordance with this law. .SO samples of Paris green were analyzed and 20 



