Mil. AVALKEE ON DIPTEEA COLLECTED AT MAKESSAK. 137 



brachial vein forming a very obtuse and much-rounded angle at its 

 flexure, almost straight from thence to the border ; discal transverse 

 vein slightly curved inward in the middle, parted by much less than 

 its length from the border, and by hardly less than its length fi-om the 

 flexure of the pra;brachial ; alulae whitish cinereous ; lower alulse of 

 the male dark cinereous. Length of the body 4^ lines ; of the wings 

 8 lines. 

 Male, Var. /3. Golden-green ; the four alulae dark cinereous. 



135. MuscA FORTUNATA, u. s. (Gen. Chrysomyia, Desv.). Mas. Sub- 

 aurato viridis, capite albo, palpis fulvis, antennis piceis, abdomine seg- 

 mentorum marginibus posticis cyaneis, pedibus nigris, alis obscure 

 cinereis basi nigricantibus, alulis albitlis. 



Male. Bright green, slightly gilded ; head white ; eyes not contiguous ; 

 frontalia black, narrow, linear ; palpi tawny ; antennae piceous, nearly 

 reaching the epistoma ; abdomen not longer than the thorax, hind 

 borders of the segments dark blue ; legs black ; wings dark grey, 

 blackish at the base ; veins black ; praebrachial vein forming an obtuse 

 and slightly-rounded angle at its flexure, almost straight from thence 

 to its tip ; discal transverse vein hardly undulating, parted by little 

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

 its length from the flexure of the prsebrachial ; alulae whitish. Length 

 of the body 3-3\ lines ; of the wings 6-7 lines. 



136. MuscA iNTRAHENs, u. s. (Gcu. Lucilia, Desv.). Fcem. Cya- 

 nescenti-viridis, capite albo, palpis antennis pedibusque nigris, alis 

 cinereis, alulis obscure cinereis, halteribus testaceis. 



Female. Bright bluish green ; head white ; frontalia dull black ; palpi, 

 antennae, and legs black ; abdomen not longer than the thorax ; legs 

 black ; wings grey ; veins black ; praebrachial vein forming a rounded 

 and very obtuse angle at its flexure, straight from thence to its tip ; 

 discal transverse vein hardly bent inward, parted by more than half its 

 length from the border, and by about its length from the flexure of 

 the praebrachial ; aluht dark cinereous ; halteres testaceous. Length 

 of the body 3 lines ; of the wings 6 lines. 



This species very much resembles M. electa, but may be distinguished 

 by its narrower body and by some slight difi'erences in the veins of the 

 wings. 



137. MuscA OPTATA, n. s. (Gen. Pyrellia, Desv.). Mas. Viridis, ca- 

 pite albido, palpis antennis pedibusque nigris, alis cinereis, alulis 

 cinereis testaceo marginatis. 



Male. Bright green ; head whitish in front ; palpi and antennaj black ; 

 abdomen a little broader and shorter than the thorax ; legs black ; 

 wings cinereous ; veins black ; pra;brachial vein forming a gentle curve 

 at the flexure, straight from thence to the tip ; discal transverse vein 

 straight, parted by much more than half its length from the border, 



