MR. F. WALKER ON DIPTERA COLLECTED AT 
Fam. ASILIDA, Leach. 
Subfam. Larurites, Walk. 
Gen. Larartia, Fubr. 
2. Laphria socia, Walk. See Vol. III. p. 84. 
Subfam. Astzrrrs, Walk. 
Gen. Asttus, Linn. 
3. Asilus condecorus, Walk. See p. 7. 
Male? Abdomen with a brownish tinge; sexualia very large. 
4, ASILUS NORMALIS, n. s. Mas et Fem. Cimereo-niger, capite sub- 
aurato, mystace e setis albis nigrisque, thorace vittis tribus anticis 
cinereis, abdomine fasciis fulvis, femoribus apices versus tibiisque 
rufescentibus, his nigro strigatis, alis nigris basi cinereis, halteribus 
sordide testaceis. Fem. Abdomine stylato. 
Male and Female. Cinereous black; head slightly gilded, with hoary 
hairs beneath ; mystax with many white bristles and with a few higher 
black bristles ; pectus and three stripes on the fore part of the thorax 
cinereous ; abdomen with bands of tawny hairs and tomentum ; legs 
stout; femora towards the tips and tibiz reddish, the latter streaked 
with black ; wings black, cinereous towards the base, the cinereous part 
extending in the disk beyond the middle; veins black, reddish at the 
base; lower branch of the cubital vein undulating; halteres dingy 
testaceous. Male. Abdomen lanceolate; sexualia small, elongate. 
Female. Abdomen elongate-conical, with narrower bands than those 
of the male ; the four apical segments forming a black, shining, slender 
style. Length of the body 7-8 lines; of the wings 12 lines. 
Gen. Ommativs, Illiger. 
. Ommatius retrahens, Walk. See Vol. IV. p. 88. 
Gen. Lrertocastrer, Meigen. 
). LEPTOGASTER EXACTA,n.s. Mas. Picea, capite pectoreque canis, 
antennis nigris basi luteis, thorace obscure rufo vittis tribus nigri- 
cantibus, pedibus pallide luteis, femoribus nigro bifasciatis, tibiis 
posticis apice tarsisque nigris, alis subcinereis apice nigro marginatis, 
halteribus pallide flavescentibus. 
Male. Piceous; head hoary behind and beneath; antennz black, 
luteous at the base; thorax dark red, with three blackish stripes ; 
sides and pectus hoary; abdomen very slender; legs pale luteous ; 
femora with two black bands, which are most distinct on the hind pair ; 
tarsi and hind tibize towards the tips and knees black ; wings slightly’ 
cinereous, black-bordered at the tips; veins black; halteres pale 
yellowish. Length of the body 6 lines; of the wings 10 lines, 
