Ai'ElL 26, 1895.] 



SCIENCE. 



463 



Parthenogenetic Generation. 



Nenrotenis lenticularis . . . . 



" liVviuscxiUis . . . . 



" numisniantis. . . . 



" fumipennis . . . . 



Aphilotrix radicis 



" Sieboldi 



" corticis 



" jilolmli 



" coUaiTS 



'■ fecundatrix . . . . 



'■ callidoma 



" Malpigliii . . . . 



" aiitumnalis 



Drj-ophaiita scutellaris . . . . 



" loiigi vent lis . . . . 



" (livisa 



Biorliiza aptera 



" remim 



Neurotenisostreus* 



Flies 

 Emerge. 



April 

 J March 

 t April 

 April 

 May 

 /April 

 \Mav 

 f April 

 I May 

 f April 

 \ May 



April 



April 

 April 

 April 

 April 

 April 



f Jan. 



\ Feb. 



Nov. 



f Oct. 

 \ Nov. 

 f Dec. 

 \ Jan. 

 /Dec. 

 1 Jan. 

 J Nov. 

 1 March 



Sexual Generation, 



Spathegaster baccarum . . 



" albipes . . . . 



" vesicatrix . . 



" tricolor . . . 



Andricus nodiili 



" testaceipes . . . . 

 ' ' gemma tiis .... 



" inflator 



" curvator 



" pilosus 



" eirratus 



" nudus 



" ramuli 



Spathegaster Ta.s(lieiil)ergi . 



" similis. . . . 



" verrucosus . . 



Teras tenuinalis 



Trigonaspis cnistalis . . . 

 Spathegaster aprilinus . . . 



Flies 

 Emerge. 



June 

 June 

 June 

 July 

 August 



August 



f July 

 \ August 

 f June 

 \July 



June 



June 



June 



June 



July 

 f May 

 \ June 

 f May 

 \ June 

 ( May 

 \ June 



July 



( May 

 (June 

 ( May 

 \ June 



H. F. Bassett July 10th of that year, though 

 not published till 1873. The synoptical 

 table bj' Straton does not add to the list as 

 originally published by Adler. The subse- 

 quent discoveries have not been many, it is 

 true,t but their inclusion would have in- 

 creased its value. The facts incidentally 

 recorded in this review add two other 

 American cases to the list, though the alter- 

 nate gall in one instance has not yet been 

 discovered. It is not difficult to observe 

 these gall-flies in the act of oviposition and 



* Franz Low (Verb. Zool.-Bot. Gesellsh. in Wien, 

 XXXIV., 1885, p. 334 ) has given good reasons for 

 believing that there was an error liere, and that the 

 agamic fonu of XeuroUrun uprilinufi Gir. is Nfurotcrus 

 Schlechlcndtili JIayr. It should also be noted that 

 Spathegaster is synonymous with Neuroterus. 



1 1 now only recall, besides those already mentioned 

 in this notice, Chilaspi'<mili<la Ger. as the agamic form 

 of C. lijioii Wachtl., and Dryoplmnta cornifex Hart., as 

 the agamic form of Syntomaxpis lazulina Fiirst.. 



to follow up the investigation until the re- 

 sulting gall is produced, and there is a wide 

 and most interesting field of inquiry which 

 offers rich results for any American biologist 

 who has the time to take it up seriously. 

 The coupling of the alternate galls with each 

 other is, however, more difficult, by direct 

 observation, and is to be arrived at rather 

 from careful identification of the flies in con- 

 nection with the galls they have been reared 

 from. Even in an epoch-making work like 

 Adler'a, the conclusions respecting some of 

 the most interesting problems connected 

 with the economy of galls and gall-flies may 

 yet be questioned, as indicated in this re- 

 view, and there is unlimited opportunity 

 for careful and conscientious direct observa- 

 tion in a field where experience shows that 

 analogy and sweeping generalizations are 

 often misleading. C. V. Riley. 



AVashixoton. 



