Pomona ('om,k»je Joirnai. ok ENToMou>tiY H^yiy 



stniiKlit to the ^Moiinil. If placwl on tht'ir liacks they coulti only ri>.'lit tlicni- 

 silvcs witli ilitTiiiiIty. If only one orniin was rt'iiiovt'd tho insects H.-w Imik 

 and forth Imt awkwardly and with hesitation and were easily hroiitrht to the 

 V'round. Tliat tin- tlics ;;o in cin-lcs wlien one of tlu'se stnietnres is removed 

 WHS not (thserved. 



Weirdaiid considers the eliordotonal orpins are for the purpoNe of steering 



and the pajiiiiary ortrans ar insiih-red hy him to he for the jnirpose of per- 



eeivinn the streiiffth ami metluid of movement of the halteres. This may he 

 true, the author thinks. Imt has found no \va.» to test this hy experiment. 

 He tried experiments in makinp tlie lialteres iinniovahle hy shellae. Imt this 

 produced the same result as when tliev wi-re ri>m">vi'il 



\V. II 



IlISTOI.OdlSCMK STIDIKN IHKH INSKKTKN TT HAS SHNSIUI.K 

 NERVKXSYSTKM DKR .KSCH.NALARVKX 



ALEXUS ZAWARZIN 



Zeit. Wiss. Zool. {". Hd.. 211. 1012 



The sen.sory nerve cell of the hipolar type is found in connection with 

 tlic peripheral sensory structure, either a knoli or a hair. In the lahrum a 

 (.rroup of cells enervate one organ. From the spindle-sha|>ed cell there are 

 two proces.ses, one to the central nervous .system — this may he varicose — and 

 one to the sensory orpui. 



Besides cells of this type there are .some of the author's t.V]>e TI. with 

 characteristic tree-like peripheral jiroeesses. Cells of this t.vpe have their 

 proee.s.ses distrihuted to the nuMuhranes hefween sepnients and appendajres. 

 Cells of this .sort have not always heen considered to he a part of the .scnsorv 

 nervous system. 



W. II 



sTATisciiK si\ni-:s()K(;ank hkt dkn nkpidf.x 



\V VI.TKR H VIN VCKK 



Zool. .lahrl.. I'd. X.XXV. Il.tl. 2. I!»12. 



This extensive article covers a hundred and sixty-six pages ami it is 

 illustrated with twelve text figures and four douhle plates. 



There is an account of the larva of \i pa riiitna L.. with special referenci- 

 to the ahdoniinal sense organs. Then follows a study of ontogeny of the organ.s 

 and then a discussion of them in the adult of this species. There is a very full 

 account of the form and structure of these organs in this species and closely 

 related ones, with some discussion of their fum-tions. 



The so-called sieve-formed stigma which are found in three pairs on the 

 alidomen of mendters of this group, are t)reatliing organs, organs fif hearing or 



