94 H. C. EFFLATOUN. 



SYNONYMY:— fcaffra Lw, CEfv. Kongl. Vet, Akad. 

 ForhandL XIV. 1857.380.27. (Helophilus) (1858) et Dipterenf. 

 Siidafr., I. 312. 1. (Helophilus) (1860); Karsch. Berlin. Entom. 

 Zeitschr., XXXI. 381.51. (Helophilus) (1887). 



DIAGNOSIS: A fairly large and handsome fly which is 

 easily distinguished by its wing venation (cell Rl open), the tuft 

 of globiferous hairs on the joint between the hind tibiae and tarsi 

 of the male and by its bright colour. 



DESCRIPTION:— Male: Face covered with shining pale 

 yellow dust and hairs except in the shallow hollow below the antennae 

 and on a rather shining median black stripe which extends to the 

 rather produced month; frons also covered with pale yellow shi- 

 ning dust and hairs (sometimes it is almost pure silvery-white) 

 except for a small shining brown and bare triangular piece at the 

 base of the antennae ; the light yellow hairs on the frons are more 

 scattered and less numerous than on the face ; vertex black with 

 some blackish hairs and the front third of the vertical triangle 

 with yellow dust ; occiput entirely covered with yellow dust and a 

 few very short, pale and inconspicuous hairs above. Eyes black, 

 bare, not quite meeting. Antennae blackish and the third joint 

 which is not long possesses a bare, simple, dark brown arista ; the 

 two basal joints possess some black, erect bristles and those on the 

 second joint are longer. 



Thorax dull black, with five conspicuous longitudinal stripes, 

 made of orange-yellow dust ; the central stripe is by far the 

 narrowest and reaches only half way down the disc ; the two 

 intermediate stripes are straight and even and reach about four- 

 fifths the way clown, where they meet and spread to the base and 

 laterally to the lateral stripes Pubescence rather abundant, but 

 very short except on the sides where it is longish, yellow and tuft- 

 ed. Scutellum large, orange-yellow, transparent, with a medium 

 pale yellow pubescence. 



Abdomen about as long as the thorax (or even longer) tapering 

 gradually towards the apex, dull black with bright orange side- 

 markings ; the first segment is dull black with a very straight grey 

 hind margin ; the second segment has the sides all orange which 

 colour extends on the disc in a large blunt triangle leaving about 

 the middle sixth of the disc black, and connecting the black base 

 with a black band winch runs right across the disc (but not to the 

 side margins) jv ,i before the narrow orange hind margin ; this 

 black band is widest at its middle and gradually narrows to a point 

 near the side margins, the black markings on this segment thus 



