98 INSECUTOR INSCITI^ M^NSTRUUS 



I have seen only varia and pulvinata in this genus, and do 

 not detect any important subgenic characters for Acritochaeta. 

 Varia has a Httle smaller palpi, its hind crossvein is more erect, 

 and its third vein is not bent back toward the tip. The abdo- 

 men of varia male is peculiar, consisting apparently of three 

 segments plus a large hypopygium ; as the Museum possesses 

 but a single male, I am unable to make a thorough study of 

 this. The abdomen of varia female, however, is like that of 

 pulvinata. 



Note. — In Proceedings of the Washington Entomological 

 Society, vol. 21, 1919, p. 106, I established a new Anthomyiid 

 genus with the name Pergandea. This being preoccupied in 

 Hemiptera, I now substitute GanpERDEa, new name. 



THE FIRST SABETHES LARVA FOUND 



(Diptera, Culicida:) 



By J. BONNE-WEPSTER and C. BONNE 



October, 1920, at Moengo, Surinam, we discovered in the 

 water of a hole in a fallen tree a few predacious Sabethine 

 larvae, feeding on Culex coronator Dyar and Knab, Culex 

 bonnece Dyar and Knab, Culex mollis Dyar and Knab and 

 even Uranotaenia loivii Theobald. The water contained many 

 green algse. To our great surprise we bred from these larvae 

 three females of Sabethes bipartipes Dyar and Knab. 



Sabethes bipartipes Dyar and Knab. 



Larva : Head broad. Lower head-hairs single, upper double ; 

 both pairs slight. Antennae cylindrical, rounded, smooth, a 

 slight tuft of two hairs on outer fifth. Mental plate narrow, 

 with a big ventral tooth and eight smaller ones on each side. 

 Maxillae conical, with one strong big horn at tip and seven 

 teeth on one margin ; a stout rod-like hair present near tip. 

 Comb of eighth segment rather irregular number of nine to 

 sixteen simple spines on a strip of chitin. Air tube conical, 

 spicular, two and a half times as long as wide ; a few small, 

 irregularly placed hairs present, two strong hooks at tip. Anal 



