AUSTRO-MALAYAN DIPTERA 489 



antennal furrows; a double brown spot on the front, about 

 midway between antennae and ocelli ; a smaller spot on each 

 side, above, near the orbit ; ocelli on black ground ; three brown 

 shadows on the occiput. Ground color of thorax yellow, with 

 many black stripes and spots : three such stripes on the dorsum, 

 all three interrupted in the region of the thoracic suture , but 

 continued again beyond it ; only the middle one , attenuated , 

 reaches the reddish-yellow scutellum ; metathorax with two 

 black stripes ; pleurae mostly black ; the yellow portions are : a 

 streak above the front coxae , connected with a large spot in 

 front of the root of the wings ; another streak above the middle 

 coxae, not reaching the root of the wings ; a large spot bet- 

 ween the halteres and the root of the wings. Halteres yellow. 

 Abdomen black ; a yellow crossband in the middle of the first 

 segment ; fifth segment and hind margin of the fourth, reddish ; 

 ovipositor ferruginous, equal in length to two thirds of the ab- 

 domen. Front legs : coxae blackish, femora yellow, with a brown 

 ring ; tibiae brown ; tarsi black ; middle legs brown, the femora 

 being broadly yellow at base ; hind legs darker brown , espe- 

 cially the tibiae : the femora yellow at base. Wings hyaline ; a 

 brown costal border, inside of the second vein ; a small hyaline 

 space between the costa and the auxiliary vein ; apex of the 

 wings brown, the boundary of this color running parallel to, and 

 not far from , the anterior crossvein , on its proximal side, and 

 then obliquely towards the hind margin, which it reaches near 

 the end of the fifth vein, inside of the second post, cell; a brown 

 band runs along the fifth vein, becomes broader on the crossveins, 

 closing the basal cells , and thus reaches the costal border ; it 

 also emits a branch running along the tip of the anal cell, and 

 the sixth vein. Length : about 9 mm. , without the ovipositor. 



Hah. Katau, N. Guinea {L. M. D'Alhertis) ; one female. 



NB. The posterior crossvein is a little arcuated ; the antepe- 

 nultimate section of the fourth vein very much so, towards its 

 tip, giving the first basal cell an almost club-shaped appearance. 

 A detailed comparison between the venation of D. ophion and 

 myrmex has been given above. 



