314 PERCY SLADEN TRUST EXPEDITION 



13. Homoneura varifrons, n. sp. 



Head (PL 15, fig. 1 4). Dull-black behind and forward to before the antennae 

 where the frons is bright orange-yellow : the side stripes on which the fronto-orbital bristles 

 stand are shining brown-black and extend far forward on the frons to the yellow cross- 

 line : the margins between these stripes and the eyes are distinct fi-om the stripes and 

 are dai-k reddish-brown; the ocellar spot is shining, and a long-pointed frontal triangle 

 extends forward from the spot which is perceptibly more shining than the rest of the 

 central part of the frons though its boundary is not well defined. The face is entirely 

 orange-yellow as are the eye-margins below and the jowls. 



Antennae : first and second joints dark orange, third with its apical two-thirds 

 blackish, the rest of it dark orange; the degree of darkening is somewhat variable. 

 Arista with the basal joint and first part of second stout, basal joints pale, flagellum 

 black with a black plumosity, which is longest at the base and tapers thence to the tip, 

 the rays below are shorter and of fairly equal length. 



Palpi darkened orange, especially on the under surface. Tongue orange with fleshy 

 tip. Head bristles normal; a row of fine bristles on the lower eye-margin above the 

 mouth edge; jowls bristly. 



Fig. 7. Homoneura varifrons, n. sp., wing. 



Thorax. All completely black, moderately shining; dorsum with a very faint brown 

 pollination, pleurae very slightly shining. Bristles normal, prescutellars rather small, 

 achrosticals in six rows. Pleurae very slightly silvery. 



Wings (Fig. 7) almost glassy, very slightly tinged with yellow; veins yellow. 



Halters with dark knobs and yellow stalks. 



Legs. In the two males the legs are all pale yellow; front femora with the usual two 

 rows of bristles behind, top row with about six equal bristles, lower row three towards 

 the tip succeeded by a ciliation. Middle femora with two bristles at the end which are 

 longer than the other normal bristles, tibi« with a crown of two long bristles as well as 

 the usual preapical one. Hind femora with an evident preapical bristle on the front side. 



Abdomen. Black with marginal bristles and small ones on the surface. The male 

 genitalia much as PI. 15, figs. 9, 10 but not extruded. 



The females, in most cases, have slightly darkened middle and hind femora, the 

 darkening extending nearly all over the joints ; the extent of this suffiision varies, and 

 in one case the legs are pale like the male. 



Size, excluding antennse, about 2f mm. 



