416 



The terminal joints and outer base of maxillis are hairy, as also 

 the base of the lip and the basilar joint of its palpi. 



The thorax is black ; an oblique yellow stripe commences on 

 each side of the back, near the base of the wing, and the two con- 

 ver^inir meet near the head ; the raeso-and meta-thorax have each 

 a pair of yellow spots of a somewhat triangular shape ; there is 

 also a triangular spot on the side of the thorax under each wing. 



Abdomen. The segments are yellow and somewhat differently 

 bordered with black on their anterior edge. In the middle of 

 the first segment a broad triangular black spot is united by a 

 narrow neck to the middle of the black border. In the second the 

 border extends backwards in a triangular form across nearly 

 the whole breadth of the segment ; in the succeeding segments this 

 i:)rojection is represented by a narrower and more pointed one. 

 Each segment has a pair of nearly square black spots, which 

 are much smaller near the last segment. 



The legs are yellow, wdth the exception of the coxae and 

 base of the femora, which are black, as also the anterior border 

 of the femora of the first pair of legs. 



Neuters. The head is the same as in the females. Antennce 

 have thirteen joints. Thorax as in the female. The black 

 bands of the abdomen are much broader on the back, covering 

 nearly the whole breadth of the segment, and have each three 

 projections, one median and two lateral, but not very strongly 

 marked ; these correspond with the central projections and the 

 pair of black spots of the female. The black bands are not so 

 broad on the abdomen as on the back. 



Males. Head proportionally much smaller, jaws less power- 

 ful, and the abdomen more slender than in either of the preced- 

 ing. A small black spot exists on the forehead, but none on the 

 clypeus ; in other respects the distribution of the yellow and the 

 black markings is nearly the same as in the neuters. 



The antennae are fourteen jointed ; the first and second joints 

 are hairy ; the second has a yellow spot on its base. 



The external markings on the females and neuters, especially 

 those of the face, are liable to some variation in different indi- 

 viduals. The middle stripe of the face may be continued on 

 either side, so as to unite with the lateral dots, thus forming 

 an inverted T shaped mark ; or the stripe may become nearly 



