Mil. WALKER ON DIPTERA COLLECTEB IN AMBOTNA. 159 



• grey, brownish along most of the costa ; prsebrachial vein as in the 

 preceding species ; discal transverse vein hardly curved in the male, 

 slightly curved in the female, parted as in the last species, nearer the 

 flexure of the prtebrachial in the female than in the male ; alulae white. 

 Length of the body 6-6^ lines ; of the wings 10 lines. 



Subfam. Muscides, Walk. 



Gen. MuscA, Linn. 



4.9. MuscA cosTALis (genus Silbomyia, Macq.). Fcern. Aureo-viridis, 

 capita aurato micante, frontalibus et faciei lateribus atris, palpis an- 

 tennis pedibusque nigris, thorace vittis quatuor auratis, femoribus 

 cyanescente viridibus, alis cinereis basi et apud costam nigris, venis 

 fusco marginatis, alulis anticis albis, posticis nigricantibus basi albis. 



C5Tiomyia costalis, Dol. MSS. 



Closely allied to 31. opulent a, Walk. vol. ii. p. 104. Female. Golden green, 

 beset with long stout black bristles. Head brightly gilded ; hind part, 

 frontalia, and face deep black, the latter with a bright gilded middle 

 ridge ; epistoma prominent. Palpi and antennae black, 3rd joint of the 

 latter rather long. Thorax purple in some aspects, with four slight 

 golden stripes. Abdomen with black spines hindward. Legs black, 

 stout; femora bluish green. Wings grey, black at the base and along 

 the costa, brown along most of the length of the veins ; prsebrachial 

 vein forming a right angle at its flexure, beyond which it is slightly 

 undulating; discal transverse vein undulating, parted by a little less 

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

 length from the flexure of the prsebrachial ; alula; white, the lower 

 pair blackish, except towards the base. Length of the body 6 lines; 

 of the wings 10 lines. 



50. Musca obtrusa. Walk. See vol. iii. p. 105. 



51. Musca bivittata (genus Calliphora, Desv.). Fam. Nigra, tho- 

 race vittis quatuor albis parallelis, lateralibus postice abbreviatis, ab- 

 domine cyaneo-viridi segmentis purpureo marginatis, alis cinereis, 

 costa exteriore venisque fusco marginatis, alulis albis. 



Lucilia bivittata, Dol. Nat. Tijd. Ned. hid. 1858. 



Female. Black. Head wanting. Thorax with four parallel white 

 stripes ; the lateral pair abbreviated hindward ; pectus white. Ab- 

 domen bright bluish green, with a slight white bloom, broader but 

 hardly longer than the thorax ; hind borders of the segments purple. 

 Wings grey, brown exteriorly along the costa and along the veins ; 

 prajbrachial vein forming a right and slightly rounded angle at its 

 flexure, beyond which it is curved inward ; discal transverse vein 

 slightly vmdulating, parted by little more than half its length from the 

 border and from the flexure of the prii-brachial ; aluliCMhite. Length 

 of the bodv 5 lines ; of the wings 10 lines. 



