in 



middle part (sometimes almost through the width) black, while the 

 pubescence on the remaining segments is almost all black excepting 

 of the posterior fring- of each segment yellow ; the seventh segment 

 clothed with dense long black bristly hairs. 



Length : 17-22 mm. 



Male. Almost like the female. Head not conspicuously larger 

 or more arched than in the female, though slightly broader than the 

 thorax. Frontal triangle greyish yellow or pale greyish yellow, con- 

 spicuously darkened at the upper angle which is prolonged narrowly a. 

 short distinct between the eyes ; the median sulcus fine, extending 

 throughout the length of the frontal triangle but never reaching the 

 top angle and just below which there are some rather deep oblique 

 depression on each side of the median sulcus. Face greyish yellow or 

 yellowish grey, bare on quite the middle but with long fairly dense 

 and fine greyish yellow or deep yellow pubescence round the bare 

 part of the epistoma and on the inflated cheeks and with much 

 numerous, longer, more conspicuous black hairs on the cheeks, the 

 black hairs in amount as some specimens bear only black hairs on the 

 cheeks ; pubescence on the lower part of the cheeks, at the back of 

 the mouth and on the jowls longer and yellow or sometimes deep yellow, 

 ami sometimes on the lower part of the cheeks there is black pubes- 

 cence intermixed. Back of the head moderately hollowed out and with 

 a very narrow yellowish bare postocular rim which at the temple 

 region is practically sunk behind the eyes, and behind which is a very 

 short though rather conspicuous black ciliation which slightly grows 

 longer near the top angle of the eyes and which has somewhat long- 

 overhanging or outstanding hairs ; vertex very small, globular, dark 

 grey and clothed with short inconspicuous black pubescence which is 

 not nearly long enough to constitute a tuft ; absolute back of the head 

 pale yellowish grey or greyish yellow, bearing some scattered yellowish 

 white soft hairs which become more yellowish and longer on the 

 lower part just behind the jowls. Proboscis as in the female, but 



