84 BRITISH APHIDES. 



White, greenish, dull yellow, or dark green. Rather 

 glossy. Long oval. Head blunt, smooth. Eyes black, 

 prominent, but very small. Body ringed. Adult 

 specimens often have a dark green stripe half way 

 down the dorsum. Legs moderately long, pale brown. 

 Antenna3 5-jointed, the last of which has a nail, which 

 Kaltenbach counts as a joint. Rostrum stout, and 

 reaches beyond the mid-body. Cornicles none. 



Young examples are slimmer, and have longer 

 antennse. Their rostra project beyond their tails. 



Found in light sandy soils, and usually in ants' nests 

 under the root-stocks of various grasses. The speci- 

 mens figured were nesting in close proximity to a 

 colony of Formica flava. In this instance I could 

 trace no connection between the two nests, but there 

 is abundant proof that Forda is a common companion 

 of Ants. One difficulty of separating a particular 

 species from another in such structures consists in the 

 very mixed company that forms these assemblies. 

 Thus in the same nest may be taken individuals belong- 

 ing to the Aphis genera, Paracletus, Trama, Forda, and 

 Endeis, and these insects are sometimes supplemented 

 by representatives of Julus, Millepes, Oniscus, and a 

 number of blind beetles. 



When the full-fed individuals of Forda are gently 

 pressed drops of a clear liquid exude from the dorsal 

 pores, and this liquid probably is acceptable to these 

 ants. This action, under the imaginative fancy of 

 Hartig and of Kirby and Spence, is expanded into the 

 likeness of milch kine, stabled underground for the 

 winter use of the Ants. 



Mr. J. Hardy kindly sent to me specimens of this 

 insect from Berwickshire. They were smaller than the 

 Haslemere specimens described above. They were 

 found during the summer inhabiting the nests of 

 Myrmica at the roots of JIolcus mollis. 



Sir John Lubbock also forwarded to me specimens 

 taken in February from similar situations at Becken- 

 ham. 



