292 Miss G. Ricardo on the Pangonine 
6. Yellow. Abdomen brownish yellow, 
browner on the posterior segments ; the 
black pubescence more widely distri- 
buted thantin tc. eee eee eee alpinus, 2, Drap. 
7. Yellow. Pubescence as in vituli. Thorax 
with three brown-grey pruinose vitte. 
Scutellumiyellowsner ere ene dorsalis, 2, Coquillet. 
8. Yellow. Abdomen yellow. Pubescence 
wholly yellow on the antennal joints and 
on thezabdomentaens se eee ee cee ochraceus, 9, Loew. 
9. Grey. Abdomen black with reddish-yel- 
low bands. Eyes bare. Legs yellowish. iritans, Q, sp. n. 
Silvius vituli, § 2, Fabr. 
One female from Polish Ukraine, 387. 43. 57 (Dowler 
Coll.), which was named Tabanus decisus by Walker ; it is 
clearly ideutical with S. vitul, Fabr. Walker’s name must 
therefore sink. 
Silvius bicolor, 2, Bigot. 
Having examined the type I think this species is very 
probably the female of S. algirus, Macq. The abdomen is 
brownish yellow with a light yellowish stripe in the centre, 
formed of indistinct triangular spots, most distinct from the 
third to the sixth segment. The first two joints of the 
antenne have black pubescence. The wings have an 
appendix. 
Silvius irritans, 2, sp. n. See Trans. Linn. Soc. London, 
(2) v. p. 183 (1889). 
Eight females from Hari-rud Valley and Khorasan, 
mentioned in the above ‘ Transactions,’ with the following 
note by Dr. Aitchison, the collector on the Afghan Boundary 
Commission :— 
‘Near Mt. Do Shakh my pcnies were nearly driven mad 
with the numbers of this very small species ; although in ones 
or twos they did not give much trouble, when in large 
numbers, as I saw them, they were extremely irritating 
to the cattle, chiefly attacking the head and fore legs.””— 
Ae 15 Abs vaXe 
The species does not seem to have been previously 
described. 
Grey. Antenne with the third joint simple; reddish, 
grey at apex of first and second joints, the third joint black 
except at its base, the space around the antenne reddish. 
Face grey, with a black shiming spot in the middle of the 
forehead above the antennee ; the ocelli are placed on a small 
