54 E. Brunetti : Notes on Oriental vSyrpliidae. [Vol. II. 



DIDEOIDES, mihi, gen. nov. 



Allied to Didca, Macq., from which it is separated by two 

 characters, viz., (i) distinctly and closeh^ pubescent eyes, and (2) 

 by the 3rd longitudinal vein (cubital, Verrall) being nearly straight, 

 as in Syrphus, and not dipped, Eristalis-Vike, into the cell below. 

 In all other respects it resembles Didea, Macq., having a bare arista 

 and the large flat ovate abdomen in- both sexes much wider than 

 the thorax, and bearing the distinct, ridged margin as in that 

 genus. 



'7:-'y ::i D. ovata, mihi, sp. nov. - . ■ ^ ] 



• ■ " cf 5 . vSikkim. Long. 12-16 mm. 



Head^ cf : face moderately produced above the mouth and 

 just below the antennae ; in depth descending only a little below 

 the eyes. Face and frons bright yellow, with moderately thick 

 yellow hair, which above the antennfe is replaced by black hairs. 

 Eyes touching for half the distance from the top of the frons 

 to the triangular elongated vertex, which is black with black hairs 

 and prominent reddish ocelli. Eyes with close grey pubescence. 

 Antennse reddish brown, situated on a tawny (darker on upper 

 side) protuberance ; 3rd joint of antennae darker on upper side, 

 arista orange, bare. Mouth and proboscis black, latter with some 

 gre}' hair at tip. Back of head greenish grey ; posterior orbit 

 of ej^es with a thick fringe of short bright yellow hair, of equal 

 length all round. 



In the ? the frons bears a broad greenish black stripe from the 

 vertex down to and enclosing the upper part of the antennal pro- 

 tuberance, the black hairs being thicker than in the cf . The 

 antennae are nearly all black except the under side of the first two 

 joints, and the under side of the 3rd at the base ; the arista is 

 more brownish than in the cf , the pubescence of the eyes almost 

 3^ellowish, especialh' on the lower pait ; but the rest oi the characters 

 are as in the other sex. 



Thorax : dorsum dull greenish aenous with three central, 

 narrow, well-separated, not ver}^ distinct brownish lines reaching 

 from the anterior nearly to the posterior margin. Sides concolorous, 

 rather darker behind ; with a broad yellow vertical stripe just 

 in front of the wing, descending to and terminating on, the meta- 

 pleurne, this stripe bearing a rather thick fringe of bright yellow 

 hair. In the 9 all the pleurae are dull greenish yellow, and the 

 hair is rather more abundant. The dorsum is covered with soft 

 short yellow hair, which around the wing-insertion is bright orange. 

 vScutellum rather dull orange-yellow, covered with soft black hairs ; 

 an orange elongated callosity on each side in front with bright 

 orange-brown hair, forming posterior corners to the dorsal surface 

 of the thorax. Metano|;um black. 



