ME. WALKEE S CATA.LOGUT; OF DIPTEROUS INSECTS 



forming a rounded right angle at its flexure, slightly curved inward 

 from thence to its tip ; discal transverse vein undulating, parted by 

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

 length from the flexure of the praebrachial ; alulae dark cinereous. 

 Length of the body 7 lines; of the wings 14 lines. 



Subfam. Muscides, Walk. 



Gen. MuscA, Linn. 



74. MuscA (Gen, Silbomyia?) diffusa, n.s. Mas. Viridis, cyaneo 

 purpureoque varia, capite aurato, frontalibus atris, palpis antennis 

 tibiis tarsisque nigris, pectoris lateribus argenteo quadrimaculatis, alls 

 obscure cinereis basi costaque basali nigris, alulis albis, halteribus 

 nigris. 



Male. Green, varied with blue and purjile. Head with gilded toraen- 

 tum ; frontalia deep black, very narrow ; epistoma piceous, prominent. 

 Palpi, antennae, tibiae, and tarsi black. Antennae not reaching the 

 epistoma. Pectus with two silvery-white spots on each side. Wings 

 dark cinereoui?, black about the base and along the adjoining part of 

 the costa; veins black; praebrachial vein forming a rounded very ob- 

 tuse angle at its flexure, nearly straight from thence to its tip ; discal 

 transverse vein deeply curved in front, parted by hardly one-third of 

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

 flexure of the praebrachial ; alulae white ; halteres black. Length 

 of the body 6 lines ; of the wings 14 lines. 



75. Musca (Gen. Silbomyia, Mac^.) costalis. Walk. See ant^, p. 159. 



Subfam. Helomtztdes, Fallen. 



G-en. Detomtza, Fallen. 

 7G. Dryomyza semicyanea, Walk. See Vol. IIL p. 109. 



Gen. Helomtza, Fallen. 



77. Helomyza scutellaris, n.s. Mas et Fcem. Testacea, crassa, 

 facie albida, antennis fulvis arista plumosa, scutello postice atro, ab- 

 domine maculis quatuor posticis nigris, alis cinereis apud costam sub- 

 luteis, venis apud marginem nigro subnebulosis. 



Male and Female. Testaceous, stout. Head black, whitish behind and 

 on the face, with several stout black bristles on the vertex and front. 

 Antennae tawny, less than half the length of the face; 3rd joint elon- 

 gate-conical ; arista plumose, full thrice the length of the 3rd joint. 

 Scutellum deep black hindward. Abdomen oval, hardly narrower or 

 shorter than the thorax, with a black spot on each side of the 4th and 



