WAiaiOU, MYSOL, AND NORTH CEKAM. 215 



Subfam. Muscides, Walk. 



Gen. SiLBOMTiA, Macq. 



61. Silbomj^ia costalis, Walk. See Vol. V. p. 159. 



62. SiLBOMYiA DECRESCENS, n. s. Mtts. Aurato-viridis, capitc flavcs" 

 centi-albo, vertice viridi, frontalibus atris, palpis antennisque nigns, 

 pectore maculis duabus argenteis, abdomine basi suturisque cyaneo- 

 purpureis, alis cinereis costam versus nigris. 



Male. Golden green, nearly allied to S. opulenta. Head yellowish 

 white ; vertex green ; frontalia deep black, linear, with bristles along 

 each side ; face very deeply grooved on each side. Proboscis, palpi, 

 and antennae black, the latter nearly reaching the epistoma. Pectus 

 with a silvery-white spot on each side. Abdomen bluish purple at 

 the base and along the sutures. Tibiaeand tarsi black. Wings cinere- 

 ous, black along the costa ; the blackish part extending diffusedly 

 along the veins ; veins black ; prsebrachial vein forming a slightly 

 rounded and obtuse angle at its flexure, slightly curved inward 

 thence to its tip ; discal transverse vein very slightly undulating, 

 parted by a little more than half its length from the border and from 

 the flexure of the pra;brachial vein. Length of the body 5 lines ; of 

 the wings 10 lines. 



Gen. Chrtsomtia, Desv. 



63. Chrysomyia divitiosa, n. s. Fcem. Purpurea, crassa, capite 

 argenteo antice aurato, frontalibus atris, palpis piceis, antennis nigris, 

 thorace antico cano vittis duabus albis, pectore maculis quatuor albis, 

 abdomine fascia subapicali interrupta argentea, alis obscure cinereis 

 basi nigris, halteribus piceis. 



Female. Purple, broad, thick, with black bristles. Head silvery, brightly 

 gilded in front ; frontalia deep black, linear ; epistoma prominent. 

 Proboscis and antennae black. Palpi piceous. Thorax hoary in front, 

 with a white stripe on each side of the fore part. Pectus with two 

 bright white spots on each side. Abdomen with a silvery interrupted 

 subapical band. Tibiae and tarsi black. Wings dark cinereous, black 

 towards the base ; veins black ; praebrachial vein forming a hardly 

 obtuse angle at its flexure, very slightly curved inward thence to 

 its tip ; discal transverse vein slightly undulating, parted by half 

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

 flexure of the pra;brachial vein ; alulae cinereous ; halteres piceous. 

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



Gen. Ptrellia, Desv. 



64. Pyrellia porphyricola, n. s. Mas: Purpurea, palpis, anten- 

 nis pedibusque nigris, thoracis tomento cinereo, alis cinereis, alulis 

 nigricanti-cinereis, halteribus nigris. 



Male. Purple, closely allied to P. obtriisa. Head, proboscis, palpi, 



17* 



