16 MR. walker's catalogue of dipterous insects 



testaceous. Antennae black ; arista as long as the thorax. Pectus white. 

 Abdominal segments with black bands. Legs long ; tarsi and tips of the 

 hind tibiae black. Wings limpid ; veins black ; fore branch of the prae- 

 brachial vein slightly curved ; hind branch extending to the border ; discal 

 transverse vein rather deeply undulating. Length of the body 4| lines ; 

 of the wings 8 lines. 

 Mount Ophir. 



50. Psilopus robusttts, n. s., foem. Purpureo-cyaneus, capite purpureo, 

 facie pectoreque albis, antennis pedibus halteribusque testaceis, thorace 

 viridi-vario, abdominis fasciis nigris, tarsis apice nigricantibus, alis sub- 

 cinereis. 



Female. Purplish-blue. Head bright purple, white in front. Proboscis and 

 antennae testaceous ; arista black, full as long as the thorax. Thorax green 

 on each side and in front. Pectus white. Abdomen with black bands. 

 Legs long, pale testaceous ; tarsi blackish towards the tips. Wings slightly 

 greyish ; veins black ; fore branch of the praebrachial vein moderately curved; 

 discal transverse vein moderately undulating. Halteres pale testaceous. 

 Length of the body. 2^ lines ; of the wings 6 lines. 



This may be the female of P. clams. 



Singapore. 



51. Psilopus sttbnotatus, ii. s., nias. Cyaneus, capite purpureo, facie pectore- 

 que albis, proboscide antennis pedibusque testaceis, thoracis lateribus anticis 

 viridibus, abdomine viridi-cyaneo basi apiceque purpurascente, tarsis apice 

 nigricantibus, alis subcinereis albido-bifasciatis. 



Male. Blue. Head purple above, white in front. Proboscis and antennae 

 testaceous ; arista black, nearly as long as the thorax. Thorax green on 

 each side in front. Pectus white. Abdomen greenish-blue, purplish at the 

 base and at the tip. Legs testaceous, rather long ; tarsi blackish towards 

 the tips. Wings slightly greyish, with two imperfect whitish bands ; hind 

 border white towards the tip ; costa interruptedly blackish ; veins black ; 

 fore branch of the praebrachial vein almost straight ; hind branch extending 

 to the border ; discal transverse vein almost straight, hardly undulating. 

 Halteres pale testaceous. Length of the body 2£ lines ; of the wings 6 lines. 



Mount Ophir. 



52. Psilopus posticus, n. s., mas. Viridis, proboscide antennis abdominis 

 fasciis pedibusque nigris, tibiis luridis, alis nigris apud marginem posticum 

 subhmpidis. 



Male. Dark green. Head above bluish-green. Proboscis and antennae black ; 

 arista nearly as long as the body. Abdomen with black bands. Legs black ; 

 posterior tibiae lurid ; fore tibiae testaceous. Wings black, rather narrow, 

 nearly limpid along the hind border ; veins black ; fore branch of the prae- 

 brachial vein slightly curved ; discal transverse vein slightly undulating. 

 Halteres black. Length of the body 2 lines ; of the wings 5 lines. 



Malacca. 



53. Psilopus tenebeosus, n.s.,foem. Purpureo-niger, facie pectoreque albis, 

 abdomine purpureo, pedibus fulvis, femoribus apice tarsisque nigricantibus, 

 alis nigricantibus margine postico fasciaque subhmpidis. 



