1 18 MR. WALKER 0 V DTPTERA COLLECTED AT MAKESSAE. 
luteis basi nigris, abdominis segmentis flavo marginatis, tarsis albis 
apice nigris, alis subcinereis dimidio basali lutesoente fasciis contiguis 
fuscis, fascia strigisque exterioribus fuscis, balteribus fulvis. 
Male and Female. Black, shining. Head yellowish -white, with four 
black bands ; 1st band on the vertex, broader than the others ; 2nd 
across the base of the antennae ; 3rd in front of the face ; 4th on the 
epistoma ; antennae pale luteous, black at the base ; hind borders of 
the abdominal segments yellow ; sides dark tawny towards the base ; 
legs pubescent ; tarsi white, with black tips ; wings slightly cinereous ; 
basal half somewhat luteous, with several partly confluent brown 
bands, exterior part with one brown band and with several transverse 
brown streaks ; veins black, pale luteous exteriorly ; discal transverse 
vein slightly curved outward, parted by about one-third of its length 
from the border, and by more than its length from the prsebrachial 
transverse ; alulae w'hite ; halteres tawny. Length of the body 3 lines ; 
of the wings 7 lines. 
Gren. Platystoma, Latr. 
174. Platystoma atomarium, n. s. Mas. Cinereum, nigro pul- 
verosum, facie alba nigro biguttata, antennis pedibusque nigris, arista 
plumosa, pectore albido, alis nigricantibus guttis plurimis limpidis. 
Male. Cinereous ; head flat above, w'hite about the eyes ; face white, 
with a black dot on each side in front ; antennae black, nearly extend- 
ing to the peristoma ; 3rd joint linear, rounded at the tip, more than 
twice the length of the 2nd ; arista plumose ; thorax with numerous 
lines of minute black points ; pectus whitish, with black points ; ab- 
domen oval, powflered with black, not longer than the thorax ; legs 
short, stout, black ; wings blackish, covered with limpid dots, except- 
ing a narrow oblique band on the transverse veins ; veins black ; discal 
transverse vein straight, upright, parted by less than half its length 
from the border, and by a little more than half its length from the 
praebrachial transverse. Length of the body 21 lines ; of the wings 
4$ lines. 
175. Platystoma basale, n. s. Fcem. Cinerea, capite lineis tribus 
albidis, antennis basi nigris, arista plumosa, thorace vittis indistinctis 
fuscis maculisquc lateralibus nigris testaceo-marginatis, scutello nigro 
vitta cinerea, abdominis segmentis albido-marginatis, femoribus anticis 
tibiisque albido fasciatis, alis subcinereis lituris transversis fascia ex- 
teriore eostam versus dilatata fasciaque subapicali nigricantibus, hal- 
teribus albis. 
Female. Cinereous ; head white about the eyes and beneath, and with 
three whitish lines on the front ; epistoma not prominent ; proboscis 
large ; antennae black towards the base, not near reaching the epi- 
stoma ; 3rd joint elongate -conical, about twice the length of the 2nd ; 
arista plumose ; thorax w ith indistinct brown stripes, and on each side 
