Pomona College Journal op Entomology 855 



straight to the f^M'ouiid. If phu'i-d on tlirit- hacks tlicy i'duIiI (inly rif,'h( llicni- 

 selves witli difficulty. If only one organ was ivTiioved the inse(!ts flew tiack 

 and fortli l)ut awkwardly and with hesitation and were easily liroiifrht to the 

 ground. That tlie Hies go in eircle.s when one of these .structures is removed 

 was not observed. 



Weinland considers the chordotonal organs are for tiie j)urpose of steering 

 and the papillary organs are considered liy liim to l)e for the purpose of per- 

 ceiving the strength and iiictlmd of nioveinciit of the halteres. This may be 

 true, the author thinks, hut has found no way to test this by e.xperiiiient. 

 He tried experiments in iiuiking tlie halteres innnovable by .shellac, but this 

 produced tiic same result as when tiiev were removed. 



W. H. 



HISTOLOGISCHE STt^DTEN TIBER INSEKTEN IT DAS SENSIBLE 

 NERVENSYSTEJT UER .ESCIINALARVEN 



ALEXIUS ZAWARZIN 



Zeit. Wiss. Zool. (". Bd., 211, 19T2 



The .sensory nerve cell of the l)ipolai- type is found in connection with 

 the peri]iheral sensory structure, either a knob or a hair. In the labrum a 

 group of cells enervate one organ. From the spindle-shaped cell there are 

 two processes, one to the central nervous system — this may be varicose — and 

 one to the sensory organ. 



Besides cells of this type there are some of the author's type II, with 

 characteristic tree-like peripheral processes. Cells of this type have their 

 processes distributed to the membranes between segments and appendages. 

 Cells of this sort have not always been considered to be a part of the sensory 

 nervous system. 



W. IT. 



STATISCHE SINNESORGANE BEI DEN NEPIDEN 



WALTER BAUNACKE 



Zool. Jahrb. Pd. XXXV, Heft. 2, 1912. 



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

 illustrated with twelve text figures and four double plates. 



There is an account of the larva of Xcpa cinerea L., with special reference 

 to the abdominal sense organs. Then follows a study of ontogeny of the organs 

 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 functions. 



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

 abdomen of members of this group, are breathing organs, organs of hearing or 



