316 Mr. J. E. Collin's Confribuiion towards knowledge of 



postero ventral fringe of long bristly hairs as compared with the row 

 of bristles in personaia ; similarly the hind femora have an antero- 

 ventral fringe of long bristly hairs among which some stronger bristles 

 may be distinguished towards the tip, and numerous posteroventral 

 long fine hairs, besides being distinctly pilose m front and (to a less 

 extent) behind. Tibiae with the pubescence (as distinct from strong 

 bristles) longer than in personata ; front tibiae with two to tlu'ee long 

 fine posteroventral bristly hairs ; middle tibiae also with the usual 

 bristles as Avell as the pubescence longer and finer ; hind tibiae with 

 an anteroventral row of bristly hairs endmg in a strong bristle to- 

 wards tip, as compared with the tkree to four short bristles of 

 personata; and with a fringe of long bristly hairs on the middle 

 third behind. Pulvilli and ungues very long. Wings very much 

 as in j)ersonaia ; postical cross-vein sloping and somewhat sinuous, 

 in neither perhaps quite so much as in personata. Alar squamae 

 distinctly larger than thoracal and as in personata with a longer 

 fringe, whereas in hnccata the fringes on the two squamae (except 

 as in all cases about the angle between them) are much more equal 

 in length. 



$. The differences between this species and personata are much 

 less marked in the female sex. It is, however, normally darker — 

 more brownish-grey — with the tomentum on cheeks and jowls 

 usually more yellowish-grey instead of silvery-grey, a distmct central 

 stripe on thorax, and with decided indications of darker hind- 

 margins to abdominal segments. An important distinction lies in 

 the arrangement of the bristles on the hind-margin of the last visible 

 (external) segment of the abdomen ; in the present species they are 

 strong stout bristles and the middle four are, like the others, j)laced 

 close to the hind-margin ; in personata they are not so strong and 

 the middle four are placed a considerable distance from the hind- 

 margin, especially the middle pair. Front tibiae more usually with 

 two posteroventral bristles, one at about middle and the other nearer 

 the tip, hind femora with about ten anteroventral bristles strongest 

 towards tip, and no distinct posteroventral bristles. 



Length 6-8 mm. 



H. obtusa is probably not rare in Britain. The late 

 Mr. Verrall caught a male at Darentb (Kent) on April 8th, 

 1870, and had also taken a female in his brother's garden 

 at Denmark Hill, London, on April 26th, 1868. Col. Yer- 

 bury caught two females at Charlton (Kent) on April 15th, 

 1897, while Col. S. Monckton Copeman found the females 

 in numbers round the burrows of Andrenafulva at Primrose 

 Hill, London, N.W., in May 1919. Two males and two 



