Séance du 2i Octobre 1023 133 



thaï il is not possible to state which of these Iwd 

 species was in his possession. 



The larvae live in the floral buds of this plant 

 and feed on the corolla and essential organs of the 

 flowers. 



Larvae and pupae were found on May i/Jth, 1908, 

 and the adults hatched on April; 20th, 1908. I have 

 bred I he other species, S. aegyptiaca from the floral 

 spikes of Ijivaixluia coronopìfoììa Poir., collected in 

 the Wadi-Hoff and placed in a room under observa- 

 tion. 



Undoubtedly these two species feed on flower- 

 heads as they were both captured by «sweeping)) the 

 flowering spikes of Stachys and Lavandula. 



I should like to take this opportunity of expressing 

 my indebtedness to Professor M. Bezzi, who kindly 

 examined my specimens and. confirmed my original 

 opinion that they were new species. 



The following table easily distinguishes the two 

 species. 



1 (•?.) Scutellum with two bristles ; wing-base 

 black; head very dark; hind tibiae with more than 

 their basal halves black S. debskii n. sp. 



2 (i) Scutellum with four bristles; wing-base hya- 

 line; head yellow; hind tibiae entirely yellow 



S. aegyptiaca n. sp. 



Spheniscomyia debskii n. sp. 



Parva, nigra, chaetarum scutellarium basalium 

 pare unico praedita, capite tolo obscuro, tibiis posticis 



