NOTES ON NEW AND LITTLE KNOWN BRITISH APHIDES. 81 



pale brownish-green to a dull greenish-pink. Antennae a little longer 

 than the body, green, except the sixth and apex of fifth segments, 

 which are darkened ; first segment much larger than the second ; 

 third longer than fourth, but a little shorter than sixth ; fourth 

 slightly longer than the fifth ; the sixth about as long as four and 

 five, its basal area one-fourth the length of the flagellum. Cornicles 

 and cauda green ; the former about one-third the length of the 

 abdomen, cylindrical, rather thin, showing faint reticulation. Cauda 

 rather thick and bluntly pointed, with three chaetae one side, two 

 the other, faintly spinose and about half the length of the cornicles 

 and more than twice as broad. Legs green, except apices of femora 

 and tibiae, the latter with a few short stiff hairs. 



Length, 1-5 to 2 mm. 



The nympha have the antennae relatively shorter than the alate 

 or apterous females, and the wing-pads green or dusky green ; the 

 Cauda being bluntly triangular and the cornicles relatively shorter 

 ihan in the two mature forms. 



Food Plant. — Festuca ovina var. rubra. 



Locality.— V^ye, May 25th, 1916. 



This Aphid was found swarming on this grass under an old 

 yew-tree in Wye churchyard by Mr. Langham and Mr. Efflatoum 

 of Cairo. The grass was killed by the host of plant-lice, which 

 in May were becoming alate. The apterae were very sluggish, 

 but the nymphae, I found on examining the infected spot, readily 

 fell off the narrow blades of grass. Mr. Efflatoum bred out the 

 alatae which are here described. 



The only Aphides recorded from fescue-grass are Tychea 

 trivialis, Passerini, Forda formicaria, Heyden, and Paracletus 

 ■cimiciformis, Heyden, all of which are root-feeders. 



The only other Aphidinae from Gramineae are Aphis donacit, 

 Paeserini,^_p/»s {Hyalopterus) anuidinis, Fabr., {xomArundo spp. ; 

 Aphis {Siphocoryne) arena, Fabr., from oats, etc. ; Aphis maidis, 

 Fitch, from corn and Digitaria, etc, ; Aphis annua, Oestlund ; 

 Aphis hold, Ferrari, on Holcus ; Aphis maidis- radicis, Forbes; 

 and Aphis poos, Hardy, on Poa sp. Of tropical species we have 

 Aphis adusta, Zehntner, on Saccharuni officinaruni ; and Aphis 

 ^orghi, Theobald, and Aphis sorghiella, Schouteden, from Sorghum. 

 Aphis mall, Linn, (pomi, De Geer), has been recorded on 

 Triticum sp. by Williams ; Aphis papaveris (= rumicis) on Zea 

 hy Passerini; Myzus persica, Sulzer, on Zea by Gillette and 

 Taylor. 



The insects described here are clearly none of these, and I 

 ■cannot connect them with any Aphid I know. The Aphis padi, 

 Kalt, so often mentioned on grasses, is 7iot the same as Aphis 

 uvena, the apple Aphid which migrates to Gramineae. 



28. Rhopolosiphum aconiti, Van der Goot. 

 This species, described by Van der Goot in 1912 (* Tijds. 

 voor Entomo.,' Iv, pp. 73-75, figs. 6 and 7, 1912), was sent me 



