18 



MB, F. WALKER ON DIPTERA COLLECTED AT 



Fam. ASILIIL^, Leach. 



Subfara. Lapiirites, Walk. 

 Gen. Laphria, Fair. 



2. Laphria socia, Walk. See Vol. III. p. 84. 



Subfam. Asilites, Walk. 

 Gen. Asiltjs, Linn. 



3. Asilus condecorus, Walk. See p. 7- 



Male ? Abdomen with a brownish tinge ; sexualia very large. 



4. Asilus normalis, n. s. Mas et Fam. Cinereo-niger, capite sub- 

 aurato, mystace e setis albis nigrisque, thorace vittis tribus anticis 

 cinereis, abdornine fasciis fulvis, femoribus apices versus tibiisque 

 rufescentibus, his nigro strigatis, alis nigris basi cinereis, halteribus 

 sordide testaceis. Fcem. Abdornine 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 find tibise 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. Ommatitjs, Illiger. 



5. Ommatius retrahens, Walk. See Vol. IV. p. 88. 



Gen. Leptooaster, Meigen. 



6*. Leptooaster exacta, n. 8. Mas. Picea, capite pectorcquc canis, 

 antennis nigris basi luteis, thorace obscure rufo vittis tribus nigri- 

 eantibus, pedibui pallide luteis, femoribus nigro bifasciatis, tibiis 

 posticis apice tarsisque nigris, alis subcinereis apiee nigro marginal is, 

 halteribus pallide flavescentibus. 



Male. Piceous; head hoary behind and beneath; antennae black, 

 lutoous at the bate ; thorax dark red, with three blackish stripes ; 

 sides and pectus hoary ; abdomen very slender ; legs pale lutcous ; 

 femora with two black bauds, which are most distinct on the hind pair ; 

 tarsi find hind tibia: towards the tips and knees black; wings slightly 

 Cinereonii black-bordered at the tips; veins black; halteres pale 

 yellowish. Length of the body W lines ; of the wings 10 lines. 



