WALKEE ON DIPTEEA OP AEU ISLANDS. yd 



dominisque maculis lateralibus trigonis albidis, abdomine purpui*eo 

 marginibus posticis nigris, tarsis posterioribus nigricantibus, alls 

 cinereis. 



Female. Cupreous green. Face silvery ; antennae, legs, and halteres 

 testaceous ; pectus, abdomen beneath, and triangular spots on each 

 side whitish ; abdomen purple, hind borders of the segments black ; 

 posterior tarsi blackish; wings grey, veins black, praebrachial vein 

 forming a right angle at its flexure, between which and the border 

 it is much curved inward, discal transverse vein very slightly curved 

 outwards. Length of the body 3 hues j of the wings 5 lines. 



This species resembles the Psilopi in the structure of the praebrachial 

 vein. 



Gen. DiAPHOBUS, Meigen. 



62. DiAPHORUS RESUMENS, n. s. Mus ct F(Bm. Obscure viridis (mas) 

 aut niger (fcem.), facie pectoreque albidis, antennis piceis, abdomine 

 nigro-cupreo basi obscure testaceo, pedibus anterioribus tibiisque 

 posticis basi obscure testaceis, pedibus posticis nigris, alis nigrican- 

 tibus apud marginem posticum pallidioribus, halteribus testaceis. 



Male and Female. Dark green (male) or black (female). Face and 

 pectus whitish ; antennae piceous ; abdomen cupreous-black, dull tes- 

 taceous towards the base ; hind legs black, hind tibiae towards the 

 base and anterior legs dull testaceous ; wings blackish, paler along 

 the hind border, veins black, praebrachial vein and discal transverse 

 Vein straight ; halteres testaceous. Length of the body 2 lines ; of 

 the wings 3^ lines. 



Earn. SYEPHID-^, Leach. 



Gen. Ceeia, JFahr. 



63. C^RiA smaragdina, n. s. Fcem. Saturate metallico-viridis, sub- 

 tilissime punctata, faciei lateribus cupreis, antennis nigris, arista 

 nivea, thorace bivittato, abdomine aeneo-viridi, tarsis nigris, alis di- 

 midio costali nigro, halteribus testaceis. 



Female. Deep metallic green, very finely punctured. Head blue in 

 front, sides of the face cupreous-purple ; mouth, antennae, and tarsi 

 black ; arista snow-white ; thorax with two almost contiguous darker 

 stripes ; abdomen aeneous green, with the exception of the petiole, 

 which is very thick ; wings slightly greyish, costal half black ; hal- 

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



64. Ceria relicta, n. s. Mas. Nigra, faciei lateribus, thoracis ma- 

 culis quatuor humeralibus, pectoris fasciis duabus laterahbus, scutello, 

 abdominis maculis duabus basahbus fasciisque duabus flavis, tibiis 

 flavescentibus apice piceis, alis apud costam nigris, halteribus testaceis. 



Male. Black. Head yellow beneath, and in front with the exception 

 of a black stripe on the disk of the face ; arista white ; thorax with 



