COLLECTED IN DUTCH NEW GUINEA. 421 



Genus RioxA. 



Rioxa Walker, Proc. Linn. Soc. Loudonj i. p. 35 (1857) ; Bezzi, Mem. lud. Mus. iii. no. 3, 

 p. Ill (1913). 



The first two species mentioned diverge from Bezzi's definition of the genus Rioxa 

 in having the second vein wavy : the third has a widely different type of wing- 

 marking. 



75. EioxA sp. 



Cf. Acanthoneura sexguttata de Meijeie, Nova Guinea, ix. p. 364 (1913). 



1 cJ . Utakwa Eiver, March 1913. 



The single specimen is somewhat damaged, and I therefore refrain from naming it. 

 The wing-pattern agrees closely with de Meijeie's figure, but the thorax has three 

 narrow longitudinal black lines on the scutum and one black spot (not three) just 

 above the pleurae. 



76. Rioxa foemosipennis. 



Rioxa formosipennis Walker, Proc. Linn. Soc. London, v. p. 252 (1861) ; de Meijere, Nova 



Guinea, v. p. 93 (1906) . 

 Acanthoneura furmosipennis de Meijere, Nova Guinea, ix. p. 365 (1913). 



1 S . Iwaka Eiver, Feb. 1911. 



1 ? . Utakwa Eiver, 3000 ft., Jan. 1913. 



77. EioxA FLATA, sp. n. (PI. XXXVIII. figs. 10, 10 a.) 

 1 $ . Mimika Eiver, July 1910. {Type of the species.) 



Head, including the whole of the antennse, light ochreous-brown or brownish-yellow, 

 the palpi darker brown ; pvt well developed, parallel ; or 2 + 2 ; arista plumose to the 

 base on both the upper- and undersides ; the antennae considerably shorter than the 

 face ; all the bristles yellowish. Thorax uniformly yellowish-brown with yellowish 

 pubescence and bristles. Abdomen orange-brown with a pair of small roundish black 

 spots on the sides of the fourth segment ; pubescence yellowish. Legs almost uniformly 

 ochreous, the extreme tips of the tarsal joints darkened ; pubescence yellowish. Wings 

 slightly yellowish-tinged ; stigma yellow, dark brown apical! y ; a narrow dark brown 

 border round the apical margin of the wing from just beyond the stigma to the termi- 

 nation of the fourth vein ; a dark brown cloud along the lower margin of the fifth vein 

 and also over the sixth vein. Second vein nearly straight ; first vein bristly to the 

 tip ; third vein with scattered bristles nearly to the tip ; fifth vein bare ; no costal 

 spine. Small cross-vein placed well before the middle of the discal cell, hind-cross- 

 vein slightly sinuous. Halteres ochreous. 



Length of body 8"5 mm., of wing 6"5 mm. 



This species is so distinct that it cannot be compared with any which has previously 

 been described. The wina:-marking recalls that of a Dacus or Bactrocera. 



