146 MB. WALKER ON DIPTERA COLLECTED AT MAKESSAB. 



166. LoNCHCEA? coNSENTANEA, n. s. Foem. Nigra, nitens, arista 

 nuda, ahdomine cyanescente-nigro, alis cinereis, halteribus albis. 



Female. Black, shining ; antennae black, nearly reaching the ej)istoma ; 

 3rd joint linear, about thrice the length of the 2nd ; arista simple ; 

 abdomen bluish black ; wings grey ; veins black, testaceous at the 

 base ; discal trausverse vein straight, upright, parted by less than its 

 length from the border and by more than twice its length from the 

 praebrachial transverse ; halteres white. Length of the body 2 lines ; 

 of the wings 3^ lines. 



167. LoNCHCEA ? ATRATULA, n. s. F(Bm. Atra, pubescens, antennis 

 epistoma attingentibus, arista plumosa, abdomine subovato, alis nigri- 

 cantibus. 



Female. Deep black, pubescent, not shining; antennae reaching the 

 epistoma ; 3rd joint linear, rounded at the tip, about four times the 

 length of the 2nd ; arista plumose ; abdomen somewhat oval, a little 

 broader but hardly longer than the thorax ; wings blackish ; veins 

 black ; discal transverse vein straight, upright, parted by less than its 

 length from the border, and by about twice its length from the prae- 

 brachial transverse. Length of the body 2 lines; of the wings 3i 

 lines- 

 Gen. Theessa, n. g. 



Fonm. Corpus breve, crassum. Caput thorace multo latins. Oculi 

 magni. Antenncs epistoma. fere attingentes; articulus 3"Minearis, 2** 

 plus duplo longior ; arista plumosa. Abdomen subovatum, thorace 

 non longius. Pedes longiusculi. Al(S parvae. 



Female. Body short, thick. Head much broader than the thorax ; front 

 wide. Eyes large. Antennae nearly reaching the epistoma ; 3rd joint 

 linear, rounded at the tip, more than twice the length of the 2nd ; 

 arista plumose. Thorax a little longer than broad ; scutellum rather 

 prominent. Abdomen nearly oval, not longer than the thorax. Legs 

 rather short. Wings small ; costal vein ending at the tip of the wing ; 

 radial vein very near the costa ; cubital vein ending at a little in front 

 of the tip ; transverse veins much retracted, very short. 



168. Thressa signifera, n. s. Fcem. Nigra, nitens, capite cya- 

 neo, antennis pedibusque fulvis, thorace strigis duabus lateralibus 

 albis, femoribus nigris, alis hyalinis apud costam nigris, halteribus 

 albis. Var. /3. Alis apud costam hyalinis macula apicali nigra. 



Female. Black, shining ; head blue ; antennae tawny ; thorax with a 

 white transverse streak on each side ; legs tawny ; femora black, with 

 tawny tips ; wings hyaline, black along the costa ; veins black ; discal 

 transverse vein parted by four times its length from the border, and 

 by six times its length from the praebrachial transverse; halteres 

 white. Var. /3. Wings not black along the costa, with the exception 

 of a black apical spot. Length of the body 1 ^ line ; of the wings 2^ 

 lines. 



