512 Mr. E. E. Austen on new 



forming a zigzag Hue. The middle and lower frontal spots 

 are somewhat narrow and in contact with the frontal 

 margin ■^. 



Chrysops Welbnanii, sp. n. 



? . — Length (5 specimens) 7 to 7t mm.; width of head 

 2^ to 2.1 mm. ; width of front at vertex 1 mm, ; length 

 of wing 7 to 73 mm. 



Head wide, flattened from front to rear ; face ivhitish grej/ ; 

 frontal callus, vertex on each side, and antennae shining black ; 

 first joint of antenna elliptical in outline when seen from 

 above, strongly incrassate, twice the length of the second joint 

 and, at the vjidest part, one and a half times as broad ; thorax 

 uniformly lilumbeous above and below, without markings ; 

 abdomen varying from ochraceotis-buff to tawny, brownish at 

 the tip ; wings hyaline, extreme base, costal border, and 

 sharply defined transverse band, tapering to hind margin, 

 blackish brown ; legs, e.vce^jt cinereous coxa, black. 



Head. — Frontal callus shallow from above downwards, but 

 very wide, extending from eye to eye ; lower margin straight, 

 sharply defined, separated from the bases of the antennte by 

 a narrow transverse band of the whitish-giey pollen which 

 covers the face ; frontal callus somewhat triangular in out- 

 line, the upper margin being j)roduced in the centre so as to 

 include the anterior ocellus ; above the callus is a narrow 

 band of grey pollen, in the middle line sending an offshoot 

 to the occiput, and leaving on each side of the vertex a 

 somewhat quadrate, shining, black area ; occipital region 

 grey ; face and jowls entirely Avhitish-grey poUinose, without 

 any shining tubercles, but oral margin blackish in front ; 

 face and underside of head clothed -with long whitish hair ; 

 palpi cinereous, elliptical in outline, clothed with whitish 

 hair ; first joint of antennae clothed with blackish hair 

 (third joint wanting). Thorax clothed with long whitish 

 hair on sides and beneath, Fost-alar calli with a reddish 

 tinge. Scutelluni blackish, hind margin fringed with whitish 

 hair, Abdoinen : a somewhat quadrate dark brown patch on 

 the middle of the first segment beneath the scutellum, 

 shading off to the hind margin ; extreme lateral margins of 



* ChnjsoiJs silacea is the species referred to by Newstead (' Annals of 

 Tropical Medicine and Parasitology, vol. i. no. 1 (February, 1907), p. 43, 

 pi. iv. fig. 1) as " Chri/sops dimidiatus, v. d. Wulp," I am responsible 

 I'or this identitication, which I formerly believed to be correct, and it 

 was not until a series of the true C. dimidiata, v. d. Wulp, was received 

 from Mr. Dudgeon, as mentioned above, that the error became evident. 



