244 C. R. Osten Sacken: Diptera 



The wings, like those of Selomyza, have a series of stronger 

 bristles along the anterior margin; nevertheless Loew places the genus 

 among the Geomyzldae (Centuriae, List of species, Vol. I, p. 266) on 

 account of the shortness of the first vein, the end of which coincides 

 vvith the end of the auxihary vein. The discal and second basal cells 

 are coalescent (this character is mentioned by Scbiner, Fauna Austr. 

 Dipt. II, VII, foot-note, but not by Macquart and Loew; on the con- 

 trary, Macquart's figure shows the second basal cell as closed). 



The species of the genus hitherto known, are Curtonotum Perrisi 

 Schin. (syn. Helomyza gibba Perris), from the South of Europe ; 

 Helom. gibba F. (Wied.). from S. America; Diploc. helva Lw., Centur. 

 II, 91, from N. Amer, and an undescribed South African species, men- 

 tioned by Loew in Centur. II, p. 288. The species from the Phi- 

 lippine Islands which I describe, is not unlike the european and North 

 American species in its coloring. 



Diplocentra arenata n. sp. Brownish-yellow, abdomen 

 with three roivs of suhcoalescent hroivn spots along the middle; 

 wings pale brownish. Length 7 — 8 mm. 



Face yellowish-white ; front reddish brown, with two short longi- 

 tudinal paler stripes on which the fronto-orbital bristles are inserted ; 

 anterior margin of the front along the frontal fissure, yellow. Antennae 

 reddish; third Joint brownish. 



Thoracic dorsum densely punctate with brown, a black hair issuing 

 from each dot; the intervals of the uots pollinose (with a dirty gray 

 anteriorly, more brownish posteriorly). Pleurae yellowish-pollinose; ill- 

 defined grayish-brown spots on the sternopleura and the hypopleura; 

 macrochaetae black. Halteres reddish-yellow. Abdomen yellowish, 

 densely covefed with short black hair; longer hairs along the posterior 

 raargins of the Segments; a brown spot in the anterior lateral margin 

 of each segment (on the ventral side) ; along the back three rows of 

 suhcoalescent brown spots: on segment one, they are coalescent and 

 form a transverse brown spot in the middle of the segment, the an- 

 terior margin of which remains yellow; on segments 2 and 3 the three 

 spots, in the shape of longitudinal brown stripes are connected by a 

 transverse brown band near the posterior margin ; on segment 4 nearly 

 the same pattern, except that the lateral stripes are reduced to a mere 

 brown spot, near the anterior margin and disconnected from the brown 

 band on the posterior. Wings uniformly tinged with brownish; posterior 

 crossvein very little oblique, slightly sinuate, clouded with brown. A 

 Single specimen (female?). 



