150 Bulletin de la Société Royale Entomolo g ique d'Egypte 



Only one specimen of this interesting Coniop- 

 terygid was taken, and it also is the first species of 

 its genus from the continent of Africa. 



In the foregoing descriptions and accompanying 

 figures most attention has been given to structural 

 details and less to colour &c. Colour, especially, is 

 extremely variable and often alters in different ways 

 after death. Some writers have stressed the impor- 

 tance of the waxy powder covering the insect. This 

 is quite useless as a character. A newly emerged 

 specimen has no powder upon it and the powder 

 always rubs off easily. It is secreted by glandular 

 areas, mainly upon the abdomen, in a similar way 

 to that in which the waxy powder of Aleurodids 

 arises. In a previous paper (Withycombe, Trans. Ent. 

 Soc. London, 1923,, p. 678) it was stated that these 

 glands were unicellular. This is not quite correct, as 

 a rule. The glands each consist usually of a group of 

 three or four cells with ill-defined cell-walls. There 

 is a darkly staining <(cap cell» to the group, and this 

 contains a distinct nucleus. The other nuclei are 

 often indistinct. The wax secreted passes to the exte- 

 rior through a short tube which is slightly movable 

 within an outer collar. The short, movable tube is to 

 be regarded as a modified hollow primary seta, or 

 macrotricliion. The gland cells are modified hypo- 

 dermal cells. All these structures are being described 

 in a later paper, but an early rectification of previous 

 slight inexactitude would appear desirable. 



The waxy powder always covers the body fairly 

 evenly, except where suitable retaining hairs are 

 absent. The only case described of the wings not being 



