322 Mr. F. Walker's Characters of undescribed Diptera 



Sub-Fam. LAUXANIDES. 



Genus Lonchcea, Fall. 

 Lonchcea discrepans. 



^neo-nigra, antennis testaceis, articulo 3" brevi conico, arista 



plumosa, pedibus piceis, tarsis testaceis, alis sub-cinereis, 



halteribus albis. 



^neous black : antennae testaceous ; tbird joint short, conical; 



arista plumose : legs piceous ; tarsi testaceous ; wings greyish ; 



veins black ; halteres white. 



Length of the body \\ line ; of the wings 4 lines. 

 Mexico. 



Sub-Fam. ORTALIDES. 

 Genus Dacus, Fabr. 

 Dacus pccloralis. 

 Ferrugineus, antennarum articulo 3" lineari gracillimo longis- 

 sinio, scutello pectoris fasciis duabus, maculisque duabus et 

 segmenti abdominalis 1' margine postico pallide flavis, femo- 

 ribus basi flavis, tarsis albidis apice ferrugineis, alis sub- 

 cinereis, vitta costali strigaque apud venam sub-analem fuscis. 

 Ferruginous : third joint of the antennae linear, slender, very 

 long, reaching the epistoma ; scutellum pale yellow; pectus with 

 a pale yellow, slightly oblique band, and with a posterior pale 

 yellow spot on each side ; abdomen with a slender yellow band on 

 the hind border of the first segment ; femora yellow towards the 

 base ; tarsi whitish, with ferruginous tips ; wings very slightly 

 greyish, with a brownish costal stripe, which is wider exteriorly, 

 and with a brown streak along the subanal vein ; discal transverse 

 vein straight, oblique, parted by about one-fourth of its length 

 from the border, and by about its length from the praebrachial 

 transverse, which is oblique in the opposite direction. 

 Length of the body 4 lines ; of the wings 8 lines. 

 Natal. 



Dacus brevistriga. 



Fcem. — Ferrugineus, capite testaceo, antennis^ fulvis, thorace 



vitta toraentosa albidd, scutello pectorisque maculis duabus 



lateralibus flavis, pedibus testaceis, alis vitreis vitta costali 



fusca, vena prcebrachiali transversa fusco-nebulosa. 



Fewja/e. — Ferruginous : head testaceous ; antennse tawny ; third 



joint rather shorter than that of D. j}cctoralis \ thorax with a 



