SCHIZONEUEA ULMI. 97 



point, and at almost equal angles. The abdomen has 

 several pores disposed upon it separate from the 

 cornicles. 



These insects are common on Pinus Austriaca at 

 Weycombe, Haslemere, from early May to December. 

 They also occasionally visit P. sijlvestris and P. Pyre- 

 niaca. They range themselves in rows down the 

 leaflets, and at their insertions or axils the Aphis 

 makes small white, cottony tufts. These tufts are 

 frequently visited by ants. 



I think it possible that Leon Dufour's Aphis pini 

 maritimcG, which he says is distinct from A. pini, Linn., 

 may be the above-described insect. His description, 

 however, is too short to decide even upon its genus. 



Late in November I collected, in company with the 

 above described, some very small examples of a bright 

 yellow or an orange-red colour. They were, however, 

 all rostrated, and yet as they contained no internal 

 embryos it is possible that these small individuals are 

 the apterous males, and I am inclined to regard them 

 as such. It has not yet been proved that the males of 

 all the Schizoneurinm are non-rostrated and incapable 

 of feeding. 



A solution of caustic potash develops from these 

 Aphides a fine crimson, which, however, does not seem 

 to be a very stable dye. The large oily globules to be 

 found in these insects, under the action of the same 

 reagent, crystallise into radiated masses like cystine. 

 The presence of a colouring matter seems to approxi- 

 mate this and other genera to the scarlet-produc- 

 ing Coccus of the Cactus. 



ScHizoNEUKA ULMI, Li^iii^ PI. CYIII and CIX, fio-s. 



1—4. 



Apliis folioTum, De Geer. 



Schizoneura ulmi, Kalt., Koch., Pass., Riley, Thomas. 

 „ Americana, Riley (?). 



