118 H. C. EFFLATOUN. 



the length of the vertex; antennal petiole long and strong, blackish, 

 except at the extreme base and apex where it is light brown ; an- 

 tennas dark reddish-brown, almost blackish, with the basal joint 

 elongate and thin, and the second and third joints much shorter, in- 

 flated, and forming together an elongate oval mass; the third 

 joint is shorter than the second with a terminal thin, acute style. 



Thorax dull black, except the humeri bright yellow and a spot 

 immediately behind the suture on the side-margin also yellow; the 

 pleurae are blackish, but with a large, elongate and conspicuous 

 yellow spot occupying all the mesopleura and most of the sterno- 

 pleura; scutellum semicircular and entirely yellow. 



Abdomen elongate, cylindrical and much narrower at the 

 base; it is somewhat dull, hut shining in places and thinly rugose; 

 the basal segment is long, dull black but with the basal corners 

 which are very inflated, broadly yellow; there is a slight depres- 

 sion at about the middle of this segment and its lower margin is 

 produced in the centre; the second, third and fourth segments are 

 black except for a conspicuous and very uniform yellow band, 

 more like a ring, on the lower margin of each segment; the band 

 on the fourth segment is a little deeper than the one on the others; 

 each of these three segments possess two peculiar longitudinal 

 depressions, one on each side of the middle; the fifth segment is 

 very short, entirely black and rather shining. Venter brown, 

 but yellow at the base, opaque and shining and with the 

 yellow rings on the dorsum continuing around each segment. 

 Hypopygium very small and reddish-brown. Legs mostly 

 yellow but all the coxae and trochanters brown; front, middle and 

 hind tarsi brown and the tibiae rwssess a brown ring near the 

 apex; the hind femora are rather thickened and their apical thirds 

 brownish; they possess two inconspicuous rows of minute black 

 spines on their ventral surface near the apex, between which the 

 tibiae fold back; the hind tibiae are subclavate and their apical 

 thirds are also brownish; the legs are entirely bare except for a 

 very minute yellow and inconspicuous pubescence beneath the hind 

 tarsi. 



Wings with almost all the upper half brownish and the lower 

 half pellucid; the brown colour extends from the costa to the vena 

 spuria; there is also a brownish border along Cubitus 2, dilated 

 at the end and extending along Cubitus 1, Media 3 and across cell 

 R; the veinlet at the bottom of the loop in Radius 4 + 5 is short. 

 Squamulae very small, pale yellow with very short whitish fringes. 

 Halteres yellow. 



Female: — Similar to the male; frons with its upper half black 

 and its lower half yellow and with a triangular dark brown mark- 



