146 



inconspicuous black hairs occur about the middle of each segment 

 (excepting for the basal segment) which are more noticeable on the 

 two or three terminal segments. 



Length: 15-16 mm. 



Male. Darker than the female, and usually with brownish red 

 lateral markings extending over the four basal segments on the angu- 

 larly ended abdomen. Head rather small, narrower than the thorax. 

 Frons quite bare, in profile slightly produced to an antennal prominence, 

 triangle, the apex being produced into a long point between the eyes, 

 covered with whitish or dull yellowish (this is only obvious when seen 

 from above) dust though its sharp upper point may be obscurely 

 darkened, and with a narrow middle furrow as in the female ; face in 

 profile not produced at all beyond the eyes, but slightly produced at 

 the front part of the jowls, with frons forming a triangle of which the 

 base rather longer than the sides, dusted with dull yellow or greyish 

 though inconspicuous rather dark bands may extend from the eyes to 

 the lower part of the antennal fossae, covered with rather long abund- 

 ant pubescence, which is black on all the cheeks and which extends 

 below the jowls but very little beneath the eyes so that it reaches (as 

 long pubescence) only about half-way under the eyes towards the back 

 of die head ; on all the epistoma the long pubescence is dull pale 

 yellow and rather sparse ; jowls moderate in size, almost always covered 

 with a dull yellow dust, and on its back and all about the mou h 

 there are long dull pale yellow pubescence similar to that on the 

 epistoma ; back of the head covered with a dull yellow tomentum, the 

 lower half only just inflated but the upper part is hollowed back from 

 the eyes and leaves only a submarginal rim which bears on its hind 

 margin extremely short black ciliation until above the middle of the 

 head, after which the pubescence becomes slightly longer and is pale, 

 while well before the top it becomes distinctly longer (though still not 

 conspicuously long) and forms a pale fringe up to the vertex, and 

 there is an obvious tuft of forwards-curved black hairs just behind 



