268 XOVITATES ZOOLOGICAE XXI. 1914. 



fifth tergites, except at each lateral e.'ctremity, bnff-yellow ; venter thinlj' pollinose, 

 and sparsely clothed with short, ajipressed hair of same colour as that on dorsum. 



Winffs : veins mummy-brown, auxiliary vein paler, first longitudinal vein near 

 end of latter ochraceous-bnff, all longitudinal veins, including costa, buff or ochra- 

 ceous-buff at extreme base of wing. 



Halteres : knobs fawn-colonred, stalks buff. 



Legs : hair and bristles entirely pale, agreeing in colour with hair and bristles 

 on body; hind femora incrassate ; claws long and slender, clove-brown or black 

 except extreme bases, which are cinnamon-coloured or cinnamon-rufous. 



Southern Algeria: type from Biskra, 5. vi. 1897 (Rev. A. E. Eaton). 



LAPHRIINAE. 



Genus DASYTHRIX Lw. 



Dasythrix trianguligera sp. nov. 



?. Length (1 specimen) 11-5 mm. ; width of head 3-2 mm.; length of wing 

 8 mm. 



First and second joints of antennae ockraceoas, third joint, except at base, which 

 is buff", cinnamon-rufous ; head and thorax black or clove-brown, thickbj and exclu- 

 sivehj clothed with white hair ; dorsum of abdomen olive-brown, clothed with oppressed 

 white hair, tergites of second and three following segments each with a more or less 

 triangular patch of short, appressed, mummy-hrown hairs, resting on kind margin 

 and not reaching either anterior border or lateral extremities of segment (beneath 

 these hairs the ground-colour itself, especially towards kind margins, is more or less 

 mummy-brown) ; wings hyaline ; legs black, clothed entirely, except on under side of 

 tarsi, with white kair and bristles, front and middle femora more or less orange- 

 rufous at base, front and middle tibiae, except tips, for most part ochraceous-buff or 

 ochraceous. 



Head : hair on face, jowls and basi-occipital region long, that on njijier part of 

 occiput and on front shorter ; palpi ochraceous, clothed with white hair ; first and 

 second joints of antennae clothed with white hair, which is especially long on under 

 side of first joint ; first joint of antennae elliptical in outline, second joint very 

 small, barely half as long as first, third joint about one-sixth longer than first and 

 second joints taken together, bottle-shaped when viewed from above, though lower 

 margin of its distal two-thirds is much more convex than upper margin wlien head 

 is viewed in profile. 



Thorax : hair on dorsum of main portion appressed, longer and erect on 

 scutellum, bristles along lateral margins of posterior jjortion of dorsum creamy- 

 white. 



Abdomen : ground colour of hind borders of sixth and seventh tergites 

 mummy-brown ; venter light mummy-brown, thinly yellowish pollinose (hind 

 borders of second and two following segments Isabella-coloured pollinose), and 

 sparsely clothed with appressed white hair. 



Wings narrow, venation closely resembling that of Dasythrix rufcornis, v. d. 

 Wulp, as shown in Trans. Ent. Soc. Lond. 1899, PI. HI. fig. 3, except that discal 

 and fourth posterior cells are narrower, appendix to discal cell is longer and more 

 parallel to vein in front of it, and that vein running from distal extremity of fonrth 

 posterior cell reaches hind margin of wing although becoming attenuate before 

 doing so ; veins for most part dark brown, but humeral transverse vein, auxiliary 



