MB. WALKER ON DIPTEEA COLLECTED AT MAKESSAB. 165 



ticus. Abdomen ellipticum. Pedes raediocres. Ala longiusculae, 

 latiusculae. 

 Female. Body rather long. Head transverse, nearly as broad as the 

 thorax ; epistoma not prominent. Antennae short, not near reaching 

 the epistoma ; 3rd joint conical, much longer than the 2nd ; arista 

 plumose. Thorax and abdomen elliptical, about equal in length. 

 Legs moderately long and slender. Wings rather long and broad. 



216. Seraca signifera, n. s. F(em. Fulva, thorace vittis quatuor 

 metathorace vittis duabus abdomine maculis lateralibus nigris, alis 

 obscm-e fuscis albo quinquesignatis apud costam nigricantibus basi 

 flavis. 



Female. Tawny, shining ; head testaceous about the eyes ; thorax with 

 four black stripes, the outer pair incomplete ; metathorax with two 

 black stripes ; abdomen with a row of black spots along each side ; 

 wings dark brown, blackish along the costa, yellow at the base, with 

 five lanceolate white marks, two of these resting on the costa, the third 

 between them near the hind border, the fourth exterior, discal, slender, 

 oblique, the fifth on the hind border near the tip ; veins black, tawny 

 at the base ; discal transverse vein curved outward, parted by about 

 one-fourth of its length from the border, and by much more than its 

 length from the prsebrachial transverse. Length of the body 4 lines ; 

 of the wings 8 lines. 



217. Seraca signata, n. s. Fcem. Testacea, longiuscala, epistomate 

 guttis duabus nigris, arista plumosa, abdomine postice attenuato ma*- 

 culis duabus lateralibus subapicalibus, ahs cinerascentibus, costa ex- 

 terior e nigricante. 



Female. Testaceous, shining, rather long ; head nearly as broad as the 

 thorax, with a black dot on each side of the epistoma ; antennae short, 

 .3rd joint elongate-conical, arista plumose; thorax elliptical; abdo- 

 men attenuated hindward, longer than the thorax, with a black spot 

 on each side of the 5th segment; wings greyish, blackish along the 

 apical half of the costa ; veins testaceous, black towards the tips ; 

 discal transverse vein nearly straight and upright, parted by about 

 one-fourth of its length from the border, and by hardly more than its 

 length from the prsebrachial transverse. Length of the body 3^ lines ; 

 of the wings 7 lines. 



Gen. PsiLA, Meigen. 



218. PsiLA BiPUNCTiFERA, u. s. Fcpm. Testacca, facie nigro bipunc- 

 tata, antennarum articulo 3° longiconico, arista pubescente, abdomine 

 guttis duabus apicalibus nigris, alis pallide cinereis flavo suff"usis. 



Female. Testaceous ; head somewhat pilose beneath, with a black point 

 on each side of the face ; 3rd joint of the antennae elongate-conical, 

 about twice the length of the 2nd ; arista pubescent ; thorax elongate, 

 somewhat flat above; abdomen fusiform, a little longer than the thorax ; 



