160 THE ENTOMOLOGIST. 



Aphis ahrotaniella, nov. sp. 



Alate viviparous female. — Head and thorax dark. Abdomen pale- 

 green with a dark patch caudad, varying from one-iialf to one-third 

 the length of the abdomen and with four large black lateral spots 

 cephalad of the cornicles. Antennae as long or longer than the 

 body, dark ; basal segment wider but no longer than second ; third 

 as long as or even longer than sixth, with 35-40 large sensoria, 

 giving a very marked tuberculate appearance ; fourth about three- 

 fourths the length of the third, with one to four sensoria ; fifth more 

 than half length of fourth, with normal subapical sensorium.; sixth 

 with basal half a little more than half the length of fifth and 

 rather less than half the length of flagellum ; fourth to sixth imbri- 

 cated. Cornicles short, dusky olive-green to brown, about as long as 

 basal area of the sixth and very much wider, gradually narrowed 

 apically (in a few even in the same specimen the cornicles are more 

 cylindrical) ; apex flared, faintly imbricated. Cauda short, as long 

 as or shorter than the cornicles, wider and blunt ; faintly spinose, 

 with six lateral hairs, dusky. Anal plate dusky. Legs rather short, 

 dark, except tibiaej which are almost green except at apex. Wings 

 large, veins very thin. Proboscis reaching to base of third coxse, 

 acuminate. 



Length. — l-5-l'8 mm. 



Food Plant. — Southernwood {Artemisia ahrotani). 

 Locality. — Great Lalkeld, Penrith, Cumberland (23, i and 

 3, iii, 13) (Britten). 



A series of alate females sent me by Mr. Britten taken as 

 early as January on the Southernwood. I had placed them 

 provisionally as Aphis tanacetina, Walker, but a closer examina- 

 tion shows the antennae to be very distinct, being (1) longer than 

 body, (2) third segment with more sensoria and tuberculate in 

 appearance, and (3) more marked still the fourth, with only 1-4 

 sensoria and the fifth very much longer than in tanacetina, and 

 (4) the cornicles broader and not contracted at the base. 



Macrosiphum solanifolii, Ashmead. 



This Aphid was described by Ashmead from potatoes in America 

 (" On the Aphidida? of Florida," ' Canad. Ent.,' vol. xiv, p. 92, 

 1882). The most recent account is given by Miss Edith Patch 

 (' Bull. 242, Maine Agri. Exp. Station,' October, 1915). On 

 going over my collection I find this species unnamed, and in two 

 cases labelled Macrosiphum solani, Kaltenbach. This latter is 

 quite distinct and is a Myziis. We have thus two green apterous 

 species on the potato of roughly similar appearance, but they 

 -can easily be separated when mounted by the Macrosiphum 

 having the apices of the cornicles reticulate (also in the alatae), 

 whilst in solani they are not, and the porrected frontal lobes are 

 marked. I have found or received solanifolii frequently in Kent 

 and Devon and have had it sent from Essex and Hertfordshire. 

 It lives on rosse in autumn, where it oviposits, and in June and 



