AFRICAN APHIDIDAE — PART III. 



•291 



The June brood is described by Mr. Willcocks as follows : — 



Head black and shiny, but sparsely covered with farinose secretion and so 

 appearing a dusky grey ; eyes red. Antennae with first segment dusky ; second 

 to fourth yellowish ; fifth yellowish with smoky apex ; sixth dusky. Thorax of the 

 same colour as the head. Abdomen brown, a mealy band at base, lateral margins 

 mealy ; a lateral row of four mealy, overlying dusky, slightly protuberant spots ; 

 two conspicuous mealy areas surrounding the cornicles ; apex mealy ; middle part 

 of abdomen always naked and thus dark. Cornicles dark. Cauda brown. Legs : 

 first pair yellowish ; tarsi dark ; second pair with dusky femora, yellow tibiae and 

 dark tarsi ; third pair as in the second, but the apex of the tibiae dark. Wing 

 insertions yellowish ; stigma smoky ; cubital smoky ; costa and obliques dusky. 

 The antennae are shorter than the body ; basal segment larger than second ; third 

 as long as 4 -f 5 and slightly longer than sixth, w^th 5-6 large round sensoria ; 

 fourth very slightly longer than fifth, to about equal ; basal area of sixth more than 

 half as long as the flagellum. 



Fig. 14. Hyalopterus insignis, sp. n. : A, antenna of alate £ ; 

 B, proboscis ; C, head and antenna of apterous $ ; D, cornicle ; 



E, cauda. 



Nymph. — Head and thorax dusky, mealy ; eyes dark red. Antennae with the two 

 basal segments of the same colour as the head ; third to fifth pale yellowish, almost 

 yellowish white ; sixth smoky. Thorax brownish, but its sparse farinose covering 

 gives the appearance of an ill-defined grey, tinged with green. Apical half of 

 wing-buds darkest. Abdomen brownish and mealy, but the median area and median 

 line are bare of the mealy substance. Cornicles dark. Cauda of the same colour 

 as the body. Legs very pale yellowish or yellowish white, slightly farinose ; femora 

 of third pair smoky. 



Egypt: Ghezireh, 20. i. 1912 (F. C. Willcocks). 



Food-plant. — Keed grass or buffalo grass. 



Described from spirit specimens and slides sent me by the collector with his colour 

 notes on the various stages. 



It lives in colonies on the undersides of the leaves. 



It is a very marked species, easily recognised when alive by the marked decoration 

 of the body. 



(C419) G2 



