204 Mr. E. Saunders' Synopsis of 



adpressed paler hairs, the 5th with a basal band of the same, and 

 the 6th entirely so covered, except a small triangular region at the 

 apex ; apical crest of the 6tli segment irregularly spined at each 

 side and emarginate in the centre ; 7tli narrowly visible beneath ; 

 under side of the abdomen with the four basal ventral segments 

 fringed with white hairs ; 5th segment just visible at the sides, the 

 rest hidden (for genitalia, &c., see PI. IX., figs. 7 — 7 a). Legs clothed 

 with ochreous-grey hairs ; front femora slightly dilated, pale, and 

 excavated beneath to receive the tibiae ; posterior tibiae slightly 

 swoUen. 



$ . Very like the <y , but with the head narrower ; the face 

 clothed with short dull grey hairs. Antennae shorter, not reaching 

 the tegulae. Abdomen with the two basal segments clothed with 

 erect pale hairs, the remainder with very short black ones ; the 

 2nd to 5th with apical bands of pale hairs, the 6th with a basal 

 band ; beneath with long greyish hairs, the extreme apical margins 

 of the segments fringed with pale hairs, apical segment with black. 

 Legs clothed with greyish hairs. Length, 9 — 11 mm. 



Hah. A maritime species, and common in many 

 places on the east and south coast. 



OsMiA, Panz. 

 Panz., Krit. Eev., ii., p. 230. 



Wings with two submarginal cells. Maxillary palpi 4-jomted ; 

 labial palpi i-jointed; ^ with the antennae considerably longer than 

 in the 2 ; the 3rd ventral abdominal segment sometimes only 

 visible at the sides ; five segments usually exposed ; 7th very thin 

 and membranous ; 8th narrowly triangular ; genital armature very 

 narrow and elongate (see PI. VIII). 5 with a dense ventral 

 pollen-brush composed of simple hahs. 



A genus which contains a large number of species, 

 although only a few occur in this country ; it has been 

 divided into several sections, depending in many cases 

 mainly on the male characters. Although these sections 

 are natural enough, and some have characteristics which 

 may be considered of generic value, I have not em- 

 ployed them here, as in a small fauna like ours I think 

 it is probably more convenient to keep the species all 

 together. 



The habits of the species of this genus are most in- 

 teresting ; some of them make their cells of mud, and 

 are amongst what are called the " mason bees " ; for a 

 good account of their habits see Smith, Cat. Brit. Hym., 

 2nd ed., p. 147. 



