320 Miss G. Ricaido on 



labanus quadrmgnatus, ? , sp. n. 



The following specimens are in the British Museum 

 collection : — 



Type (female) and another female from Ruwe, Lualaba 

 Elver, Congo Free State, circa 11° S., 26° E., Feb. 1906 

 {Dr. A. Yale Masseij), 1906. 98. 



A well-marked species nearly related to Tahanus fratemus, 

 Macq., better known as Tahanus trisignatus, Loew (which is 

 a synonym of the ]\lacquart species), but easily distinguished 

 from it by the four distinct triangular median spots, the older 

 species having only three, and by the heavily striped thorax 

 and bright red-yellow antennae. In the thoracic stripes it 

 resembles Tahanus kingsleyi, from which it is distinguished 

 by the markings of the abdomen. 



It is a medium-sized species with black thorax, marked 

 with two distinct broad greyish stripes, a reddish-brown 

 abdomen with yellowish-grey side spots besides the median 

 ones, blackish legs with red-yellow tibise, and clear wings 

 very slightly tinged brown. 



Length 13^-15 mm. 



Head wider than thorax. Face reddish (denuded) , in the 

 other specimen it is covered with greyish-yellow tomentum 

 and with white pubescence ; beard white. Palpi very pale 

 yellow, with white pubescence, slightly broader at base, 

 ending in a moderate point. Antennse bright red-yellow ; the 

 first joint cylindrical, hardly at all cap-shaped, with greyish 

 tomentum and black pubescence and a few white hairs ; the 

 second very small, with black pubescence ; the third long, 

 darker at its apex, with a moderate tooth. Forehead reddish 

 (denuded), with yellowish-grey tomentum, nearly five times 

 as long as it is broad, narrowing anteriorly ; the frontal 

 callus red-brown, oblong, not reaching the eyes, the line 

 proceeding from it is short and thick, some black hairs on 

 the vertex. Ihorax blackish brown, the two broad stripes 

 continued to base, composed of grey tomentum, with 

 yellowish pubescence ; sides with grey tomentum, the 

 pubescence on dorsum black, with whitish hairs round the 

 base of wings and continued from the base of the stripes 

 round thorax to the sides. Breast and sides reddish, covered 

 with grey tomentum and with white pubescence ; black hairs 

 above. Scutellum reddish yellow at base, black in the centre, 

 with black pubescence and yellowish hairs elsewhere. Abdo- 

 men reddish brown ; some grey tomentum on the first 

 segment, on the four following segments a grey, toraentose, 

 median, triangular spot, all with broad bases, the first one 



