xv, 5 Bezzi: Fruit Flies from the Philippines 431 



end, ending near the middle of exterior border of first posterior 

 cell. First basal cell infuscated above the second; hind cross 

 vein margined with fuscous, fuscous border narrow above, 

 broadened below, and dilated along hind border of wing into 

 third posterior cell, to reach sometimes (chiefly in the male) 

 the anal stripe. The last is very broad and long, being dilated 

 at end in the male and reaching hind border of wing. 



16. Chaetodacus tetrachaetus sp. nov. Plate I, fig. 10. 



Related to the preceding species and likewise distinguished 

 from C. caudatus by the smaller size, the black mesonotum, and 

 the distal end of the costal border of the wings not being broad- 

 ened; but it is distinguished from C. mundus and from C. syn- 

 nephes by the brown anal stripe of the wings being quite 

 wanting. 



Panay, Antique Province, Batbatan Island (McGregor). 

 Type in my collection. 



Male. — Length of body, 6.5 to 7 millimeters; of wing, 6.5 to 

 7. Head and its appendages as in C. mundus; frons without 

 lateral brown spots, but with a distinct and convex middle 

 dark spot, the latter clothed with dense and rather long pubes- 

 cence ; two shining black oval spots on face near end of antennal 

 grooves. Cephalic bristles black; only two pairs of lower or- 

 bitals. 



Back of mesonotum as in C. mundus, but yellow supra-alar 

 stripe prolonged in front of suture to reach humeral calli, as 

 in C. continuus; it is moreover reddish in front between humeral 

 callosities, and on sides at outer border of the yellow supra-alar 

 stripe, pleura, mesophragma, and scutellum as in C. mundus, 

 but propleural region, lower border of sternopleuron, and breast 

 more broadly reddish; scutellum pellucid on its central part, 

 the yellow sides thus forming a pair of yellow spots. Bristles, 

 squamula?, and halteres as in C. mundus. 



Abdomen as in C. mundus, but black basal band of second 

 segment extending to sides, being there united with the black 

 lateral border; middle black longitudinal stripe broader and 

 extending to hind border of last segment; lateral black spots 

 of fourth and fifth segments narrower and forming an equal 

 black border; black cilia of third segment more numerous. Fem- 

 ora entirely yellowish and quite unspotted; front and middle 

 tibia? more or less infuscated; hind tibiae black and strongly 

 tuberculate before the end; pretarsi whitish. 



Wings (Plate I, fig. 10) as in C. mundus, but with the super- 



