106 



FRED. V. THEOBALD. 



Alate and apterous females taken by Mr. Willcocks agree in all characters with the 

 common European Macrosiphum sonchi, which has been found on the following plants 

 in Europe : — Sonchus oleraceus, Centaurea nigra and cultivated varieties, Serratula 

 arvensis, Chrysanthemum segetum and cultivated Chrysanthemums ; Lapsana com- 

 munis, Picris hieracioides, Crepis biennis, Hieraciu7n sylvestre, Lactuca and various 

 Carduus. 



Macrosiphum compositae, sp. nov. (%. 1). 



Apterous viviparous fe^nale. — Black ; tawny to some extent at the sides in a few 

 specimens ; base of femora and most of the tibiae reddish brown. Antennae black, 

 longer than the body, but not quite reaching to the tip of the cauda ; first segment 

 much larger than the second ; the third long, with 80-90 sensoria scattered over its 

 whole length, but scanty at the apex ; fourth and fifth segments equal in length, 

 shorter than the third ; the sixth as long as four and five, its basal area about one- 

 fourth the length of the fifth segment, the fourth and fifth imbricated and with the 

 usual sensoria ; hairs on the third faintly capitate. Two median capitate hairs in 

 front on the head and three on the prominent frontal lobes. Eyes large and black. 

 Abdomen with slightly capitate hairs. Cornicles black, very long, in many cases 



Fig. 1. Macrosiphum compositae, sp. n, ; A, antenna of apterous $ ; 



B, b, cornicles; C, cauda. D, antenna of alate, $; E, cauda; 



F, proboscis of apterous $ ; G, proboscis of alate $. 



quite half as long as the body, slightly expanding basally, and projecting well beyond 

 the cauda, the apical area reticulate, the rest markedly imbricated, in some specimens 

 they are straight, in others they are curved outwards. Cauda black, prominent, 

 from about one-fifth to one-fourth the length of the cornicles, bluntly pointed and 

 spinose, with six pairs of lateral hairs and three median dorsal ones. Anal plate 

 black, with some prominent hairs. Legs long, especially the tibiae of the hind legs ; 

 femora black, except at the base ; tibiae pale with black apex ; tarsi black ; femora 

 and tibiae with short, stiff bristle-like hairs, especially numerous on the latter. 

 Length, 3 mm. 



Ahte viviparous female. — Antennae longer than the body ; black ; basal segment 

 very much larger than the second ; the third longer than the fourth with 90-100 

 sensoria scattered over its whole length, some much smaller than others, the small 



