xv, s Bezzi: Fruit Flics from the Pliilippines 415 



that the genera Dacus sensu stHcto, Tridacus, Tetradacus, and 

 Callantra have not yet been found in the Philippine Islands. 



a 1 . Antennse 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. 

 6\ 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. 

 <f. 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. 



<P. Thorax with three or four supra-alar bristles, the anterior ones 

 well developed; abdomen as a rule with free segments on the 

 middle. 

 e\ 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 3 . Wings of male with a well-developed supernumerary lobe; abdom- 

 inal segments free; anal brown stripe of wings well developed; 



Oriental Chaetodacus p. p. 



b*. 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. 



«\ 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 antennae wholly separated. 



/?\ 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. 



h 1 . 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 



