NEW MYRMECOPHILOUS APHIDES. 55 



blunt spine-like processes all around and some longer hairs. Cauda pale, 

 rounded, with minute, dense, blunt spines and longer hairs. Anal plate I'ounded 

 and similarly adorned. Cornicles very pale, moderately long, showing faint im- 

 brication aud tine serrated edges. Legs, including the ungues, very pale, hairy, 

 with the apex of the tibiae projecting on one side in a short, sharp process. Pro- 

 boscis pallid, reaching beyond the third coxae. 



LeiKjth. l-8mm. 



The nymph is very similar but the cornicles are slightly longer ; the wing pads 

 are pallid and semitransparent. 



Locality. Wye, 27 x. 1911 (Theobald). 



obscrrotions. Found in the nest of Lasins fJaviis and also feeding 

 on dandelion roots. I found many apteraB in both situations, but 

 when I searched for them some ten days later, none could be found ; 

 as the nymphs were appearing on the 27th, probably they had all 

 become winged and fled. It is possibly the ground form of some other 

 described species, but I have named it provisionally. The ants were 

 watched "milking" the females whilst they were suckiisg the sap from 

 the dandelion roots, 



MaCROSIPHUM FORMICARIUM, nOV. Sp. 

 Alate viviparous female. Head dark brown. Antennte much longer than the 

 body ; basal segment brown, much longer than the second, which is pale, rest of 

 antenna dark brown, except just the base of the third; third segment a little 

 longer than fourth, with about 20 sensoria over about two-thirds of its length; 

 fourth segment longer than fifth, which has a large sub-apical sensorium ; hairs 

 scanty, rather long and stiff. Eyes black. Proboscis pale, black at the apex, 

 reaching to the second coxae. Thorax dark. Abdomen pale with dark lateral 

 spots from which arise longish hairs from distinct tubercles ; over the rest of the 

 abdomen also arise straight stiff hairs from pale tubercles. Cornicles very long, 

 cylindrical, slightly swollen at the base, dark, except just at the base, reticulate 

 for the greater part of their length, markedly imbricated near the base, which is 

 uniulorned. Cauda large, bluntly lanceolate, pale with three large pale hairs on 

 each side and two median sub-apical ones. Legs moderately long, pale yellowish- 

 green with dark areas at the apices of the femora and tibiae and dark tarsi ; rather 

 long, stiff hairs on the femora and tibias. Wings ample, with brown veins, pale 

 brown stigma and pale insertions. 



Lemjtlt, 2-3mm ; /c/vi// e.rpanse, 7mm. 



Localitij. Lundy Island, 9 vi. 1913 (Donisthorpe). 



Obserratiom. Described from a single specimen taken by Mr. 

 Donisthorpe in a nest of Lasinn flavim. The cornicles are very long, 

 and peculiar in that they are reticulate over nearly their whole length ; 

 the stiflf hairs on the body are also characteristic. As the specimen 

 had been for some time in spirit, it is not possible to give the actual 

 coloration. Koch describes an underground Macrosiphum as Siphono- 

 phora sabten-a}i('a, but this species has shorter cornicles and a black 

 Cauda. 



I have received two other species of Macrosiphum from ants nests, 

 but both too damaged to describe. One was an apterous female of a 

 uniform pale colour, with black eyes ; long, thin, straight, imbricated 

 pale cornicles; cauda long, uniform and pale. Tarsi dusky. Length, 

 2-3mm. Taken by Donisthorpe in a nest of Lasins nit/cr at Rossbeigh, 

 Co. Kerry, in June, 1902. 



The other was sent to me by Mr. Britten, taken " in ants' nest at 

 Great Salkeld, Penrith." 



I think these are the only records of this genus being found in ants' 

 nests. 



