6o Records of the Indian Museum. [Vol. IV, 



It may be noted here that some confusion may possibly arise, 

 and erroneous deductions arrived at by a misunderstanding, as to 

 whether the width of the frons is measured across the vertex or 

 across the middle. 



Mr. Austen, in his paper dealing with these genera measures 

 along the vertex, but I have alwa^'s adopted the second course, 

 taking its average width, ignoring the widening at the vertex and 

 towards the frontal triangle ; or in other words I have regarded its 

 width as the distance between two perpendicular lines drawn so as 

 to touch the greatest length of eye margins. 



My thanks are due to Prof. Bezzi for some valuable notes on 

 Lyperosia and Hceniatohosca and especialh^ to Mr. E. E. Austen for 

 information, respecting Lyperosia niinuta and L. cxigua, enabling 

 me to avoid describing both species again as new. The former 

 I knew only from four specimens (African) in indifferent condition ; 

 the latter from the description only, in which, be it noted, no men- 

 tion is made of the conspicuous long hairs on the hind tarsi in the & . 

 As my descriptions of both species have been drawn up from a 

 good series of both sexes of each species, I allow them to remain 

 as redescriptions of mimita and exigiia ; the original descriptions 

 of these two species not always being accessible. 



In connection with studies on this group, the following papers 

 may be consulted : — 



1. E. E. Austen. A monograph of the Tsetse flies {Glossina). 



London, British Museum (1903). 



2. K. Griinberg. " Uber blutsaugende Musciden," Zoologis- 



cher Anzeiger, xxx, y8 (1906). 



3. M. Bezzi. " Die Gattungenderblutsaugenden Musciden," 



Zeits. Hymen, v. Dipt., 1907, p. 413. 



4. M. Bezzi. " Mosche ematofaghe," Rend. Istit. lomb. di 



sci. e lett.. 1907, p. 433. 



5. E. E. Austen. '' New genera and species of blood-sucking 



Muscid?e from the Ethiopian and Oriental Regions, 

 in the British Museum," Ann. Mag. Nat. Hist. (8), iii, 

 285 (1909). 



6. E. E. Austen. Illustrations of African blood-sucking 



flies, other than mosquitoes and tsetse flies. London, 

 British Museum (1909). 



Table of genera in STOMOXIN^. 



A Arista plumose above and below. 



I. 1st and 3rd longitudinal veins at base bare. 

 Apical part of 4th vein quite straight, 

 ist posterior cell rather narrowly open. 

 Body generally more slender (Lypcrosia-like). 

 Palpi comparatively less spatulute. 



Arista with comparatively fewer hairs below Hceniatobosca ,^ 



Bezzi. 



1 Not yet recorded from the Orient, but occurs in Italy. 



