310 Dr. C. P. Alexander on 



the Curator, Mr. Hugo Kalil, and from the Staatsmuseum 

 in Vienna, through the kindness of the Custodian of the 

 Diptera, Dr. Hans Zerny. Tlie hitter collection was one of 

 the very greatest imi)ortance. Tl>e location of the types 

 of the new species described herein is designated after each 

 description. 



Dicranonii/ia mascarensis, sp. n. 



General coloration ])rown ; wings greyish hyaline, stigma 

 oval, pale brown ; pale brown seams at origin of Rs and 

 along the cord ; Sc^ ending immediately before the origin 

 of Rs ; cell \st M^ closed ; basal deflection of Cu^ imme- 

 diately i)efore the fork of M. 



Male. — Length about 4*2 mm. ; wing 52 mm. 



Kostrnm and palpi dark brown. AntenUcC dark brown. 

 IJead dark brown, discoloured in the type. 



Mesonotum dark brown, any possible pruinosity dis- 

 coloured in the type. Pleura and sternum dark brown. 

 Halteres rather elongate, brown, the basal portion of the 

 stem obscure yellow, the apices of the knobs a little paler. 

 Legs with the coxse dark ; trochanters obscure yellow ; 

 remainder of legs testaceous-brown. Wings greyish sub- 

 hyaline ; stigma oval, pale brown ; a brown cloud at the 

 origin of Rs -, very indistinct brown seams along the cord 

 and outer end of cell \st M2 ; veins dark brown. Venation: 

 Sci ending immediately before the origin of Rs, Sc^ 

 apparently close to the tip of Sci ; Rs gently arcuated ; 

 r faint, at the tip of lli ; inner end of cell R^ far proximad 

 of cell i?.5 ; cell 1^/ M^ closed, about as long as vein M^j^^ 

 beyond it ; basal deflection of Cu^ a short distance before 

 the fork of M. 



Abdomen dark brown, the basal sternites paler. Male 

 hypopygium with the pleurites very short and stout, the 

 proximal face near the apex with three cylindrical fleshy 

 lobes that are tipped with long bristles, one of these lobes 

 slender, ai'cuate, the others shorter and stouter ; proximal 

 side of pleurite extended caudad into a fleshy arm that is 

 setigerous on proximal face. Ventral pleural appendage 

 much larger than pleurite, pale, subcircular in outline, the 

 proximal margin extending proximad into a fleshy lobe with 

 two spines on the caudal margin near mid-length of the lobe. 

 Dorsal hook conspicuous, almost straight, the distal third 

 gently curved, the tip suddenly narrowed to an acute point. 



