MR. WALKER ON DIPTERA COLLECTED AT MAKESSAR. 157 



head a little narrower than the thorax, with a black point on the front ; 

 face blackish grey ; palpi with a black dot on each outer side ; an- 

 tennae pale luteous, not reaching the epistoma; 3rd joint linear, 

 rounded at the tip, about four times the length of the 2nd ; arista 

 bare ; thorax with three black lines and with two short and more ex- 

 terior black streaks ; metathorax black, shining ; pectus with some 

 black marks on each side ; abdomen fusiform, hardly longer than the 

 thorax, with two black bands near the 4)ase ; legs moderately long ; 

 wings vitreous, rather long, with two narrow brown bands, the interior 

 band emitting two brown streaks to the base of the wing, the exterior 

 band curved, continued along the costa to the tij) of the radial vein, 

 the space beyond it mostly occupied by an elliptical brown patch ; 

 veins black, straight ; discal transverse vein straight, upright, parted 

 by more than half its length from the border, and by nearly twice its 

 length from the oblique prtebrachial transverse. Length of the body 

 4^ lines ; of the wings 9 lines. 



Gen. Ortalis, Fallen. 



The two following species belong to a new group of Ortalis, and will 

 probably form a distinct genus. 



193. Ortalis decatomoides, n. s. Mas. Obscure rufa, thorace 

 brevi, abdomine nigro, fusiformi, basi rufo, pedibus fulvis, femoribus 

 posterioribus basi albidis, tibiis posticis nigris, alis subcinereis, macula 

 apicali fasciisque duabus nigricantibus. 



Male. Dull red ; head rather large, a little broader than the thorax, 

 blackish on each side of the face ; antennae wanting ; thorax short ; 

 abdomen black, shining, fusiform, red at the base, a little narrower 

 but hardly longer than the thorax ; legs tawny ; posterior femora 

 whitish at the base ; hind tibiae black ; wings slightly greyish, rather 

 convex along the hind border, blackish at the tips, and with two 

 blackish bauds ; first band rather oblique ; veins black ; praebrachial 

 vein and cubital vein slightly curved and approximating towards the 

 tip of the wing ; discal transverse vein straight, upright, short, parted 

 by much more than its length from the border, and by full twice its 

 length from the praebrachial transverse, which is extremely short ; 

 Length of the body li line; of the wings 2^ lines. 



194. Ortalis vacillans, n. s. Fcem. Fulva, arista pubescente, ab- 

 domine nigro postice lanceolato, alis limpidis, costa striga basali fas- 

 ciisque tribus nigricantibus. 



Closely allied to D. decatomoides. Female. Tawny, shining ; head full 

 as broad as the thorax ; e])istoma slightly prominent ; antennae nearly 

 reaching the epistoma ; 3rd joint linear, conical towards the tip, about 

 four times the length of the 2nd ; arista pubescent ; abdomen black, 

 a little longer than the thorax, lanceolate hindward ; wings limpid, 

 blackish along the costa, with a blackish streak, and with three slen- 



