134 MB. r. WALKEU ON NEW SPECIES 0¥ DIPTEKA 



from the praebracliial transverse vein, which is oblique ; halteres pale 

 yellow, with black knobs. Length of the body 6 hnes ; of the wings 

 13 lines. 



Gren. Plattstoma, Latr. 



9. Platystoma impingens. Fcem. Nigro-cinerea, capite albo ver- 

 tice fronteque luteis vittis duabus lateralibus nigris, thorace vittis 

 tribus canis duabusque lateralibus cinereis guttis duabus lateralibus 

 nigris, abdomine lateribus basi tibiisque posterioribus rufescentibus, 

 alis albidis guttis plurimis fasciisque quatuor exterioribus fuscis, halte- 

 ribus testaceis. 



Female. Cinereous black. Head white, narrower than the thorax ; ver- 

 tex and front dull luteous ; face elongated, tinged with pale yellow ; 

 a broad black shining stripe on each side. Antennae piceous, not half 

 the length of the face ; third joint piceous, about four times the length 

 of the second, which is red ; arista plumose. Thorax with three 

 hoary stripes and with two intermediate cinereous stripes; a black 

 dot on each of the two outer stripes. Abdomen oval, much shorter 

 and narrower than the thorax, with some short hoary hairs, which are 

 mostly on the hind borders of the segments ; sides dull reddish 

 towards the base. Legs black ; posterior tibiae dark reddish, except 

 towai'ds the tips. "Wings whitish, with numerous brown dots towards 

 the base, and with four exterior brown bands ; first band irregular, 

 partly composed of dots ; second slightly guttular in front, connected 

 on the hind border with the third, which is connected in the middle 

 with the irregular subapical fourth band ; veins black ; discal trans- 

 verse vein straight, parted by one-fourth of its length from the bor- 

 der, and by very much more than its length from the oblique prsebra- 

 ehial transverse vein ; alulae white ; halteres testaceous. Length of 

 the body 6 lines ; of the wings 12 lines. 



Gen. Dacus, Fahr. 



10. Dacus turgidus. Mas. Niger, capite flavo punctis duobus ma- 

 cula fasciaque nigris, antennis fulvis, thorace vittis quatuor halteribus- 

 que flavis, abdomine subpetiolato fascia flava, pedibus piceis femoribus 

 sordide flavescentibus basi albidis, alis limpidis vittis duabus nigrican- 

 tibus costa extus valde dilatata. 



Male. Black. Head yellow, with two black points on each side be- 

 tween the eyes, and a black middle spot, which is forked hindward ; 

 face with a black band in front. Antennae tawny, little more than 

 half the length of the face ; third joint elongate conical, about twice 

 the length of the second ; arista plumose. Thorax with four yellow 

 stripes ; outer pair extending to the base of each wing, and thence 

 bent across each side of the pectus ; inner pair extending along each 

 side of the metathorax. Abdomen fusiform, subpetiolated, much 

 longer and narrower than the thorax, with a yellow band on the fore 

 border of the second segment. Legs piceous ; fore femora dingy 



