48 PHILIPPINE DIPTERA, II 



189. Pterogenia centralis sp. nov. 



Allied to P. luteipennis, but distinguished by the very different 

 coloration of mesonotum and scutellum. 



Female. Length of body, 5.5 millimeters ; of wing, 5.5. Head 

 as in P. luteipennis, the shining occipital yellow border without 

 black spot in the dilated part; frons yellow, with an elongate, 

 double reddish brown spot in the basal part ; face with a rounded 

 black spot at end of the antennal grooves and with a narrow 

 black line, dividing the epistoma from the jowls without black 

 crossband. Antennae as in P. luteipennis, but the second joint 

 black and the arista more shortly plumose, the breadth of 

 feathers being only equal to the breadth of the third joint. 

 Mesonotum and scutellum black, opaque, with dense, shining 

 yellowish pubescence; on dorsum a yellow stripe from the 

 yellow humeri to the suture, curved inward at end and another 

 from the suture to the scutellum, a yellow notopleural stripe, 

 and below this two broad, parallel yellow stripes one on 

 mesopleura, the other on upper part of sternopleura ; hairs of 

 pleurae whitish and yellowish. 



Scutellum yellow, with a basocentral, rounded black spot. 

 Squamae whitish; halteres yellowish. All the bristles black; on 

 scutellum a pair of long apical bristles and some other pairs 

 of shorter ones. Abdomen as in P. luteipennis, but the yellow 

 hind borders of second and third segments broader, and the 

 third segment with a middle longitudinal yellowish stripe; 

 pubescence black, but yellowish on the yellow parts; ovipositor 

 black, depressed; venter black, with black hairs. Coxae black; 

 femora reddish brown with blackish stripes below and behind; 

 tibiae yellowish with black ends ; tarsi whitish, with the last three 

 joints black. Wings whitish hyaline with only the extreme base 

 less distinctly yellowish; three complete fuscous crossbands, 

 the first near base, the second below the stigma and crossing the 

 discoidal cell, the third extending from apex of the marginal cell 

 to the middle of the second posterior cell ; the hind cross vein 

 margined with fuscous only below and not included in a band, 

 but above it from costa to a little before the fourth vein there 

 is a dimidiate crossband in the hyaline space between the 

 second and third crossbands; in the apical hyaline space some 

 fuscous spots, forming one or two irregular crossbands. Veins 

 yellowish brown, directed as in P. luteipennis, but the second 

 longitudinal vein distinctly a little wavy, not straight ; anal cross 

 vein distinctly longer than that at end of the second basal cell. 



MINDANAO, Butuan (Baker). 



