Rev. F. D. Morice on Armatures, etc. of Andrena. 239 



and the transverse basal plate (Plate VI, Figs. 9 to 

 13). Many eccentric effects are produced by extreme 

 development of the geniculation, which seems to absorb, 

 as it were, the pilose part beyond and make it shorter, or 

 at least give it a bend which foreshortens it in the ventral 

 view. (It seems to me that whenever a geniculation is 

 lobate, it invariably looks much nearer the apex of the 

 segment than usual ; and the length of a process is 

 generally in inverse ratio to the strength of its genicula- 

 tion.) Extremely paradoxical are the laterally -toothed 

 (cruciform) processes shown in Plate VII, Figs. 6, 7, 8, 9 

 (see also Plate VI, Fig. 16). I cannot find that these have 

 ever been described or figured, but they are surely a most 

 striking " character." Lastly, an exaggeration of that 

 thickening of the process on its naked side, which in Plate 



VI, Fig. 2a, y suggests a minute subapical tooth, gives in 

 the lateral view a paradoxical aspect to the apex of the 

 process in nigro-olivacea, Dours, and livens, Perez (Plate 



VII, Figs, lb, 26). And to conclude — for I see I have said 

 " lastly " a little too soon — though a bilobed apex may 

 disappear in some species by variation, such a development 

 of it as appears in bucejjhala, Steph. (Plate VI, Fig. 17), is 

 a character that may probably be trusted. 



As to the pilosity — I think that even in the normal 

 types this is principally developed near the geniculation, 

 the hairs becoming sparser and shorter towards the apex. 

 But in many paradoxical forms the phenomenon becomes 

 far more conspicuous. Thus in alhicrus, Kirby (Plate VI, 

 Fig. 7), argentata. Smith and others, the pilosity is 

 practically confined to the geniculation, which it encircles 

 with a definite belt, the apex of the process standing up 

 naked beyond it. In ovina, Klug, suerinensis, Friese, etc., 

 it forms not so much a belt as a pair of lateral brushes at 

 this point, and the rest of the process is manifestly 

 clothed less densely. In ephippncm, Spin. (Plate VI, 

 Fig. 13), the lateral brushes are again conspicuous, but the 

 process is very hairy at the apex also. In Fig. 16 (scita, 

 Ev.) there is a tremendous development of hair over the 

 whole process, but we still see the strong brushes of the 

 geniculation asserting themselves independently. While 

 in bucephala, Steph. (Fig. 17), though the sides of the 

 process are fringed all along with hair, it is still possible 

 to distinguish a pair of special brushes at the 

 geniculation. 



