262 



and exopterygotic Orders there occur forms that are wingless, e. g., 

 the females of many Lampyridae, in which there coexist the absence of 

 wings and diminution of the change of form in the successive instars 

 that make up the Ontogeny. 



The Mallophaga and Anoplura again are purely parasitic forms 

 and thus differ entirely from the Aptera and Apontoptera. Although 

 the Aptera and Apontoptera have been associated by Packard as 

 Synaptera it is still very doubtful whether there is any real affinity 

 between these two Orders. 



These considerations render it evident that we are not yet in a 

 position to finally classify the wingless Orders of Insects. 



Those who wish to do so may however adopt temporarily three 

 divisions for them viz., 1) Synaptera, for Aptera and Apontoptera, 

 2) Parasitica, for Mallophaga and Anoplura, 3) Anapterygota, for 

 Siphonaptera. 



In reference to the construction of the new names here proposed 

 it is perhaps right to point out that as it has been thought desirable to 

 apply the termination -"ptera" to all the Orders for the sake of an uni- 

 form terminology, it is clear that in the case of the wingless Orders 

 this termination can only be correctly used by combining it with some 

 term signifying "destitute of". Hence the names I propose to apply 

 to the wingless Orders indicate in each case the absence of wings. 



The Zoological Laboratory, Cambridge, November 1903. 



12. On the presence of mobile fat in the Chromatophores of the Crustacea 



(Hippolyte varians). 



By Frederick K.eeb le, University College Reading, and F. W. Gamble, Owens 



College Manchester. 



eingeg. 1. Dezember 1903. 



The present paper is an abstract of our researches into the distri- 

 bution and movements of fat in the prawn Hippolyte. 



The researches have been carried on at Trégastel (Brittany), at 

 Naples, and in the laboratories of Owens College Manchester, and 

 of University College, Reading. 



1) Distribution of Fat. ^TîjopoZy^e offers a remarkable contrast 

 to crabs, lobsters, and cray-fish with respect to the distribution of its 

 fat. In these latter, according toDastre(1901), storage-fat is confined 

 to the liver: in Hippolyte we find that it occurs not only in liver, but 

 also in the chromatophores and epidermal cells. As means of identi- 

 fication, we use 1) the optical characters of the granules, 2) the osmic 

 acid reaction, 3) that of Sudan 3. and Scharlachrot (Michaelis me- 

 thods). 



