﻿606 Prof. Mario Bezzi's Report on a Collection of 



12 (11). Hind margin of the eyes indented ; proboscis usually short. 



13 (14). Second longitudinal vein issuing from the third at an acute 



angle far before the first cross-vein ; first cross-vein far 

 behind the middle of the discal cell . Lomatia, p. 613. 



14 (13). Second longitudinal vein issuing at a right angle opposite or 



nearly opposite the first cross- vein; if far before, the 

 angle is never acute. 



15 (18). Second longitudinal vein issuing from the third some 



distance before the first cross-vein, at least at a distance 

 which is greater than the distance of the cross-vein itself. 



16 (17). Two subniarginal cells . . . Petrorossia, p. 615. 



17 (16). Three submarginal cells ; anal cells broadly open ; wings 



petiolate ; proboscis long . Isotaniia, gen. n., p. 627. 



18 (15). Second vein issuing opposite or nearly opposite the first 



cross-vein, the distance at any rate being smaller than 

 the length of the cross-vein itself. 



19 (22). Antennal style with a pencil of hairs at the tip ; genitalia 



of the male of somewhat larger size, symmetrical. 



20 (21). Third antennal joint lenticular, with a projecting margin; 



abdomen with silvery spots ; wings obliquely bordered 

 with black on the anterior half . . Anthrax, p. 620. 



21 (20). Third antennal joint not so shaped ; abdomen with scales ; 



wings clear with some brown spots 



3Iulybdamoeba, p. 617. 

 22(19). Antennal style without pencil of hairs; genitalia of the 

 male smaller, unsymmetrical. 



23 (26). Two submarginal cells only. 



24 (25). Face rounded ; wings clear, at most only blackened on the 



fore margin ...... Villa, p. 623. 



25 (24). Face prominent; wings with extensive dark or black 



markings ..... Thyridanthrax, p. 625. 



26 (23). Three or four submarginal cells. 



27 (30). Three submarginal cells. 



28 (29). Face conically produced ; proboscis short 



Exoprosopa, p. 635. 



29 (28). Face rounded ; proboscis long . Litorrh\inchus, p. 629. 



30 (27). Four submarginal cells . . . Hypernlonia, p. 651. 



1. Bonthylius, Linné (1758). 



Two species only, belonging to two distinct groups. 



1. Bowbyliiis micans, Fabricius (179S). 



A male specimen of this well-known South African 

 species from Nyika Plateau, Urongo stream, North Nyasa, 

 July 14th, 1909 (Br. J. B. Bavey). 



