512 Mr. E. E. Austen on neio 



forming a zigzag line. The middle and lower frontal spots 

 are somewhat narrow and in contact with the frontal 

 margin^. 



Chrysops Wellmanii, sp. n. 



$ . — Length (5 specimens) 7 to 7§ mm.; width of head 

 2}^ to 2?, nmi. ; width of front at vertex 1 mm. ; length 

 of wing 7 to 7A mm. 



Head wide, flattened from ft'ont to rear ; face ivhitish grey ; 

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

 first joint of antetina elliptical in outline when seen from 

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

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

 uniformly plumbeous above and beloiv, without markings ; 

 abdomen varying from ochraceous-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, except cinereous coxce, 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 antennae by 

 a narrow transverse band of the whitish-grey pollen which 

 covers the face ; frontal callus somewhat triangular in out- 

 line, the upper margin being produced in the centre so as to 

 include the anterior ocellus ; above the callus is a narrow 

 band of grey polJen, 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 pollinose, 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 Avhitish 

 hair ; first joint of antennas clothed with blackish hair 

 (third joint wanting). Thorax clothed with long whitish 

 hair on sides and beneath. Post-alar calli with a reddish 

 tinge. Scutellum blackish, hind margin fringed with whitish 

 hair. Abdomen : 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 



* Chrysops 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 " Chrysops dimidiutus, v. d. "Wulp." I am responsible 

 for this identification, 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. 



