XV. 6 
Bezzi: Fruit Flies from the Philippines 
415 
that the genera Dacus sensu stricto, Tridacus, Tetradacus, and 
Callantra have not yet been found in the Philippine Islands. 
cs 1 . Antennas as long as face or only a little longer, carried very near the 
face and with first joint not elongate, even shorter than second; face 
hollowed in the middle; abdomen not properly stalked, though some- 
times a little constricted at base; second basal cell short, usually 
not more than twice as long as broad. 
ft 1 . Thorax without prescutellar bristles; scutellum with a single pair 
of bristles, the basal one being always wanting. 
c 1 . Wings of male without supernumerary lobe at end of anal vein, 
cfi. Thorax with only two supra-alar bristles, the anterior one being 
quite wanting; abdomen often with no distinct segmentation 
along middle line; anal brown stripe of wings less developed 
or wanting; Mediterranean or Ethiopian species Dacus s. s. 
<f. Thorax with three or four supra-alar bristles, the anterior ones 
well developed; abdomen as a rule with free segments on the 
middle. 
e 1 . Thorax with but one anterior supra-alar bristle; anal brown 
stripe of wings usually well developed; ovipositor not pe- 
culiarly swollen at base; Ethiopian Tridacus Bezzi. 
e *. Thorax with two anterior supra-alar bristles; no anal stripe 
on wings; ovipositor greatly swollen, bottle-shaped at base; 
Japanese Tetradacus Miyake. 
c 2 . Wings of male with a well-developed supernumerary lobe; abdom- 
inal segments free; anal brown stripe of wings well developed; 
Oriental Chaetodacus p. p. 
F. Thorax always provided with prescutellar and with anterior supra- 
alar bristles; scutellum sometimes with two pairs of bristles, the 
basal pair often present; wings of male, as a rule, with- a well- 
developed supernumerary lobe; Oriental. 
f. Wings adorned with transverse, fuscous bands. 
Bactrocera Guer.-Men. 
f. Wings not banded Chaetodacus Bezzi. 
of. Antennae much longer than face, carried far apart from it and with 
the first joint usually elongate, as long as second; face not or little 
hollowed, usually flat or even convex; abdomen typically stalked, 
club-shaped; thorax without prescutellar bristles; femora sometimes 
spinose beneath; wings with second basal cell more elongate, usually 
many times longer than broad, and without supernumerary lobe in 
the male; Oriental. 
g 1 . Basal joints of antennas wholly separated. 
ft 1 . Face flat or even a little concave; thorax with transverse 
suture broadly interrupted in the middle and destitute 
of unpaired acrostical bristles ; front femora not spinose 
beneath or very rarely so; second portion of fourth 
longitudinal vein straight, the discoidal cell being less 
narrowed at base Mellesis Bezzi. 
ft*. Face distinctly convex; thorax with transverse suture 
not interrupted and often with a strong acrostical 
bristle on the middle line; front femora with some 
spines beneath near the end; second portion of fourth 
