16 MB. walkeb’s catalogue of diptebotjs insects 
testaceous. Antennse black ; arista as long as tbe 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 pree- 
brachial vein slightly curved ; hind branch extending to the border ; diseal 
transverse vein rather deeply undulating. Length of the body 4J lines ; 
of the wings 8 lines. 
Mount Ophir. 
50. Psilopus bobustus, n. s., foem. Purpureo-cyaneus, eapite purpureo, 
facie pectoreque albis, antennis pedibus halterihusque testaceis, thoraee 
viridi-vario, abdominis fasciis uigris, tarsis apice nigricantibus, alia sub- 
einereis. 
Female. Purplish-blue. Head bright purple, white in front. Proboscis and 
antenuse 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 preebrachial vein moderately curved; 
diseal 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 subnotatus, n. s., mas, Cyaneus, eapite purpureo, facie pectore- 
que albis, proboscide antennis pedibusque testaceis, thoracis lateribus anticis 
viridibus, abdomine viridi-cyaneo basi apieeque purpuraseente, tarsis apice 
nigricantibus, alis subcinereis albido-bifasciatis. 
Male. Blue. Head purple above, white in front. Proboscis and antennas 
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 preebrachial 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 Opliir. 
62. Psilopus posticus, n. s., mas. Yiridis, proboscide antennis abdominis 
fasciis pedibusque nigris, tibiis luridis, alis nigria apud marginem posticum 
sublimpidis. 
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 tenebbosus, n. 8., foem. Purpureo-niger, facie pectoreque albis, 
abdomine purpureo, pedibus fulvis, femoribus apice tarsisque nigricantibus, 
alis nigricantibus margine postico fasci&que sublimpidis. 
