416 
Philippine Journal of Science 
1919 
vein deeply sinuous, the discoidal cell being thus much 
narrowed on the basal half Monacrostichns Bezzi. 
g~. Basal joints of antennas united in the shape of a common 
petiole Callantra Walk.’ 
The first three genera, as far as known, are not represented 
in the Philippines. Dacus and Triclacus are not Oriental; the 
two species of true Dacus found in India ( longistylus Wied. and 
hrevistylus Bezzi) are evidently of African origin; Dacus asiat- 
icus Silvestri 8 9 10 is only a variety of the Mediterranean D. oleae 
Grnelin; but the presence of true Oriental forms lacking pre- 
scutellar bristles is demonstrated by the two Philippine species 
described below'-; and moreover by the recently described Tetra - 
dacus tsuneonis Miyake, 111 from Japan, as well as by the Austra- 
lian Dacus cucumis French, w T hich lacks also the anterior supra- 
alar bristle. 
The Philippine species without prescutellar bristles ( atrichus 
and ablepharus) , are evidently more closely allied to Chaetodacus 
than to Tridacus, as shown by their sexual wing dimorphism, 
and by their close affinity with cilifer Hendel, which has well- 
developed scutellar bristles. They have no close affinity with the 
African species of Dacus sensu stricto, like annulatus, mochii, 
blepharog aster, erythraeus, etc., which usually have a noncil- 
iated third abdominal segment in the male and are likewise 
prevalently black and of a rather small size, but all have no 
anterior supra-alar bristle, partly fixed abdominal segments, and 
no b^owm anal stripe on the wings. A possibility of an African 
origin for these Philippine species seems thus to be excluded. 
I. Genus BACTE-QCERA Guerin-Meneville (1830) 1838 
It seems that, for practical purposes, it is still convenient to 
keep the species with banded wings separate from those with 
nonbanded. wings and thus the following genus is maintained 
here as distinct; but if the two species with a single crossband 
on the wings ( frauenfeldi Schiner and albisirigata de Meijere) 
are placed in the present genus, and if the recently discovered 
African species of Dacus sensu stricto with partly banded wings 
( hamatus Bezzi and trig onus Bezzi) are taken into consideration, 
the separation of the two genera seems to be very doubtful. 
8 The genus Diplochorda Gsten-Sacken, 1880, placed in the Dacinse by 
Hendel, 1911, and by Edwards, 1915, is now considered as belonging to 
the Phytalmiidae by Hendel himself, Wien. ent. Zeitung 33 (1914) 74, note. 
9 Atti R. Accad. dei Lincei, Roma V 25 (1916) 425. 
10 Bull. Imp. Central Agr. Exp. Sta. Japan 2 (1919) 92, pi. 2, fig. 1. 
