2S BRITISH APHIDES. 



The lowest temperature of the previous night was 

 21° Fahr. The naturally extruded eggs were black, 

 but they were not of a true oval form, being attenuated 

 at one end, and deeply corrugated. Those within the 

 abdomen were of a normal shape. The collateral 

 glands, close to the vaginal orifice, were well made out 

 under the microscope ; also dissection showed a well- 

 marked expansion of the alimentary canal into a 

 distinct but somewhat small stomach. The presence 

 of this organ shows that the perfect sexes therefore 

 are capable of taking nourishment, which is not the 

 case in some species of Aphis lower in the scale of 

 development. 



This appears to be a species hitherto undescribed in 

 Europe. 



In America, however. Fitch has described, under the 

 name of the " Chestnut Gay-louse," a sulphur-yellow 

 Aphis, which may prove to be identical with the above 

 British species. The measurements (0"09 inch) and 

 wing cloudings differ, however, and there are other 

 minor points, which make it unsafe to decide the point 

 without inspection of the continental species. I place 

 Fitch's insect, therefore, as a doubtful but probable 

 synonym. 



