224 C. B. Osten Sachen : Diptera 



The venation is very like that of Naupoda, only the second basal 

 cell is less broad, and a little longer. The he ad is broad, almost 

 Ach las- like, the interval between the eyes being broader than the 

 horizontal diameter of each eye, taken separately; the occiput is not 

 cloRely applied to the thorax (as it is in Naupoda). The antennae 

 are distant at their bases; scapus small; the second Joint (or base of 

 the third?) as the figure seems to show, bears a styliform organ, poin- 

 ted at the end and about as long as the third Joint; third Joint ellip- 

 tical; arista plumose. Thorax rounded, broader than long; Abdomen 

 comparatively small (the segments are not indicated in the drawing). 



Asyntona resembles Gorgopis in the breadth of the front and 

 the remote antennae; but differs in the shape of the head and thorax; 

 the shape of the head does not allow it to be closely applied to the 

 thorax; the thorax is more rounded in front; the abdomen compara- 

 tively larger than in Gorgopis; the venation is altogether different, the 

 basal cells being enormously developed here, while they have the usual 

 shape in Gorgopis. 



The drawing, which is reproduced liere, bore no name; I call the 

 genus Asyntona, in allusion to the carriage of the wings, which are 

 not fully expauded, but somewhat bent under, towards the end. 



Asyntona Doleschalli n. sp. Metallic blue, legs and 

 antennae (apparently) hlack, tarsi yellowisTi. Length 5—6 mm, 



Hab. Amboina (Doleschall). Doleschall's drawing bears the date 

 of January 28 1859; he died Febr. 26 of the same year. 



Trypetidae. 



A comparatively small proportion of the Trypetidae from South- 

 Eastern Asia can be referred to the groups, formed for the European 

 or North-American species. A number of new genera have been intro- 

 med for them by different authors; but, except the well-characterized 

 genus Ptilona v, d. Wulp, those genera require a closer definition. 

 Unable, on account of insufficient materials, to draw up such definitions> 

 I have attempted to point out some characters, principally chaetotactic, 

 that may be of use in future. 



Dacus Icarus n. sp. $. Body brownish-yellow; scutellum 

 lemon-yellow, with four long bristles; likewise yellow are: the humeri, 

 a pleural stripe between them and the pteropleura, a more or less 

 Square spot on the mesopleura, under that stripe, and the lateral meta- 

 pleural callosities. Thoracic dorsum with three dark brown stripes, not 



