1913-] M. Bezzi: Indian Trypaneids {Fruit- Flies). 149 



collected at Batavia, 27- vi — ç-viii-oô by Mr. Brunetti ; an additional specimen is from 

 Sibu, Sarawak, 2-vii-io, coll. Beebe. 



25. Aciura, Robineau-Desvoidy. 



Rob.-Desv., Essai sur les Myodaires, 773, xüi (1830). 



Allied to the preceding, but distinguished from it and from the others by the 

 presence of only the basal pair of scutellar bristles, the apical being entirely wanting ; 

 the pubescence of the thorax is black. 



Head broader than high ; eyes large, rounded ; face a little concave ; frons and 

 epistome not prominent ; antennae inserted toward the middle of the eyes, the third 

 joint rounded, the arista pubescent or almost bare; cheeks narrow ; frons not much 

 narrowed forwards ; proboscis short, palpi bristly ; oc. strong ; or. 2. 3 or i. 3 ; genal 

 bristle strong. The occipital row seems to be variable, a feature which shows in my 

 opinion that the genus is still composed of heterogeneous elements ; in the typical 

 species the bristles are black and thin ; in some American species {insecta, phoeni- 

 ciira) ' are all yellow and thin ; in one of the Indian species here described, those on the 

 vertex (4) are yellow, short and stout, the others are black. 



Thoracic chaetotaxy complete ; pt. strong and only i strong mpl. Scutehum 

 convex, bearing only the basal pair of bristles. Abdomen narrowed at the base, con- 

 vex, with or without small apical and lateral bristles ; ovipositor variable, short and 

 broad, flattened, or long and narrow, less flattened, or very long, longer than the 

 abdomen. Front femora bristly below ; middle tibiae with a single spur. 



Wings elongate, with the costal bristle more or less developed ; first vein very 

 short ; 4th curved in the middle of the last portion, 3rd bare ; the cross- veins perpendi- 

 cular and approximate, the small one is placed in the apical third or fourth of the 

 discal cell ; inferior angle of the anal cell more or less drawn out into a point, which is 

 always short. Pattern of the wing somewhat variable, but the wings usually black, 

 with hyaline indentations and hyaline discal spots ; in the middle of the fore border, 

 after the stigma, there are usually two hyaline triangular indentations, while in 

 Spheniscomyia only one is present. 



Type : Musca coryli, Rossi, 1790. 



The species of this genus are not common. Of the Palaearctic species only coryli, 

 rotundiventris and tibialis are typical ; alacris, caloptera and winnertzi shows a different 

 wing-pattern ; filiola is described as having 4 scutellar bristles, and belongs to Sphe- 

 niscomyia, as stated above. 



The two Indian species before me are distinguished as follows : — 

 I. (2). Pvt. and superior occipital bristles black; frons bearing in the 

 middle very few pale hairs; ovipositor narrow, as long as the 

 abdomen .. ., .. .. .. monochaeta,n. sp. 



' These two species, having yellow pubescence on thorax, are perhaps better placed in the new 

 genus Tephrella. 



