MR. F. WALKER ON DIPTERA COLLECTED AT 
tinged here and there with cupreous; abdomen cupreous, with the 
lst segment and a slender stripe deep black; the following segments, 
which are black along their hind borders, bluish green ; legs black ; 
wings prownish cinereous, tinged with brown near the base; pra- 
brachial vein forming a rounded right angle at its flexure, very slightly 
curved inward from thence to its tip; discal transverse vein slightly 
undulating, parted by less than one-third of its length from the border, 
and by very much more than its length from the flexure of the pre- 
brachial. Length of the body 73 lines; of the wings 17 lines. 
Subfam. Muscrpzs, Walk. 
Gen. Musca, Linn. 
12, Musea promittens, Walk. See Vol. IV. p. 134. 
Subfam. Orvatipes, Haliday. 
Gen. Pratrystoma, Latr. 
13. Platystoma potens, Walk. See p. 12. 
CERAM. 
Fam. STRATIOMID, Haliday. 
Gen. Prttocera, Wied. 
> 
1. Ptilocera 4-dentata, Fabr. See Vol. I. p. 7. 
Gen. Criretnarta, Meigen. 
2. Clitellaria obesa, Walk. See Vol. V. p. 232. 
Fam. TABANID, Leach. 
Gen. Tapanvs, Latr. 
‘3. TABANUS SERUS,n.s. Foam. Cinereus, capite subtus pectoreque 
albis, antennis fulvis apice nigris, thorace vittis duabus ferrugineis, 
callis humeralibus testaceis, abdomine pedibusque fulvis, alis cinereis 
apud costam fuscis. 
Female. Black, with cinereous tomentum ; head beneath and pectus 
white; callus black, very slender, broader in front; palpi cinereous ; 
antennz tawny with cinereous tomentum towards the base, 3rd joint 
slightly curved, black towards the tip, with a very small horn; thorax 
with two ferruginous tomentose stripes; humeral calli testaceous ; 
abdomen tawny, elongate-conical; legs tawny; tarsi black; wings 
cinereous, brown along the costa; veins black, with the usual struc- 
ture, tawny at the base; halteres pale. Length of the body 6 lines; 
of the wings 12 lines. 
