260 Mr. E. Sa,vinders\further notes on the 



hidden beneath the 6tb, and the 8th appears at the apex, 

 bemg generally somewhat dilated apically and rounded 

 or subtruncate ; the 7th is sometimes emarginate in the 

 centre of the apical margin. The armature is very little 

 liable to variation in the genus, and except in a few 

 species shows no important modifications. It has the 

 stipites bent and arched over the sagittae, and each flat- 

 tened and more or less pilose at the apex (see Trans. 

 Ent. Soc. Lond., 1882, PI. X). Andrena carinata, Mow, 

 is a notable exception. 



Macrojns. — This genus is most peculiar in its ter- 

 minal segments (see Trans. Ent. Soc. Lond., 1882, 

 PL X.), the 7th segment being subquadrate and fringed 

 at the sides with a series of flattened spines ; the 8th is 

 produced at the apex into a subrotundate process, 

 terminating in a sharp point ; the genital armature 

 has the stipites each terminating in two deflected fur- 

 cate prolongations, very unlike that of the surrounding 

 genera. 



Dasypoda and Cilissa. — In both these genera the 8th 

 ventral segment is exposed beneath as in Andrena, and 

 dilated at the apex ; the 7tli is hidden and generally 

 emarginate at the apex, with a lateral projection on each 

 side (see Trans. Ent. Soc. Lond., 1882, PI. XI). 



Panurgus. — All eight ventral segments exposed in 

 some species, the 6th being emarginate so as to show 

 the 7th, the 8th projecting and dilated at the apex, 

 as in Andrena and its allies ; armature with the cardo 

 very elongate (see PL V., figs. 1, 2). 



Panurginus. — All eight ventral segments exposed; 7th 

 slightly elevated, narrowed and bidentate at the apex ; 

 8th with an elongated central process fitting into the 

 emargination of the 7th segment, its apex slightly 

 swollen and rounded ; armature very like that of 

 Panurgus, with the cardo very elongate. 



Dufourea. — 7th segment hidden, bilobate ; 8th with a 

 long straight central process, visible beyond the 6th ; 

 armature with the stipites pointed, the sagittffi distant 

 at the base (see PL V., figs. 4 — 4 b). 



Systro2)ha. — 7th ventral segment consisting of a basal 

 band, from which emerge two elongate processes some- 

 what curved, thickest in the middle and pointed at the 

 apex, with an elevated ridge on each on the side nearest 

 the armature (see PL XIIL, fig. 13 a) ; 8th with an elon- 

 gate apical process, bent upwards, and hairy beneath 



