PACHYRHJXA. 349 



Antennae bright yellow or orange-yellow; flagellum wholly blackish, 

 except 1st joint, which is sometimes yellowish, bases of all the 

 nagellar joints after the 1st very narrowly blacker. Thorax deep 

 lempn- or chrome-yellow ; the three usual dorsal stripes deep 

 black, shining, clear-cut ; the median one reaching the anterior 

 margin or not, very narrowly extended (sometimes) on each side 

 for a short distance ; on each side of the collare, adjacent to the 

 end of the median stripe, is a brown or black mark, which is 

 repeated on the adjoining part of the uiesothorax ; the two outer 

 thoracic stripes quite straight, with clear-cut rounded tips, with- 

 out any sign of curving outwards or downwards ; post-sutural 

 stripes short, wide, equally shining black, contiguous in front to 

 those in front of the suture, and carried forward a little along the 

 suture, joining a brownish spot placed immediately above the 

 wing-root ; posteriorly they reach the scutelluin, which may be 

 wholly dull yellow, or wholly shining black. The metanotum may 

 be lemon-yellow, the lower part bearing an orange tint, or it may be 

 either yellow or orange, with a wide black band on the lower 

 part ; the pleura? adjacent to the metanotum bear a black stripe 

 contiguous to it ; sides of thorax concolorous with dorsum ; 

 sternopleura with median third concolorous, the upper and lower 

 parts tinged with orange. Abdomen bright orange-yellow ; pre- 

 sumably the normal banding consists of a moderately narrow black 

 posterior border to each segment, the first segment being either 

 yellow at the base or more or less black-marked ; the abdominal 

 bands seem to he weakest on the 4th and 5th segments ; the 6th 

 segment is nearly or wholly black, the remainder to the tip 

 yellow. Ovipositor brownish yellow, shining, rather long. Legs : 

 coxa?, femora, and tibia? bright yellow or orange-yellow; fore 

 femora with a dark brown broad band (ill-defined at the edges) in 

 the middle, occupying about half the length, sometimes indistinct ; 

 tips of all femora and tibiae very narrowly blackish ; tarsi blackish. 

 Wings nearly clear ; subcostal cell dark brown, ending in a large 

 oval dark brown stigma ; petiole of 2nd posterior cell compara- 

 tively long or absent. Halteres blackish, tips dull yellow. 



Length 17-1 9 rnillim. 



Redescribed from three females in the Indian Museum, taken at 

 the base of the hills in the Nairn Tal district, two at Bindukhera, 

 3. iv. 10, and one at Gangapur Pattia, 4. iv. 10. The species also 

 occurs in Java, Sumatra, and Ceylon. 



I think there can be no doubt that the three females in the 

 Indian Museum are this species and that it is very variable. 

 Osten Sacken surmised as much, noting the variability of the 

 abdominal markings and the spots on the pleura? ; whilst various 

 remarks in the three different descriptions of this species (Dole- 

 schall's, Macquart's, and Osten Sackeu's) support this view. The 

 three examples before me are distinctly lemon-yellow, especially 

 on the thorax, thus agreeing with Doleschall's " citrino-flavo." 



