Hev. F. i). Morice on Armatures^ etc. of Andrena. 233 



the interior outline seem to catch the eye most easily. 

 Any marked deviation from their usual approximation 

 makes the armature look peculiar (see Figs. 8, 11, 19, and 

 especially 10 *) ; and such a condition arises whenever the 

 interior outlines of the lobes are wholly or in part excep- 

 tionally concave or convex. 



The exterior outlines of the lobes seldom differ, except 

 in their greater or less convexity and convergence towards 

 the base. In A. ficssx, Panz., however (Fig. 17), the lobes 

 swell out so that their outlines actually diverge for some 

 way from the process downwards, and bring the broadest 

 part of the armature much nearer to its base than in any 

 of the other species here figured. Normally the greatest 

 breadth of the armature is at or about the origin of the 

 process. 



While the process is usually rugose and dull, the lobes 

 are nearly always smooth and shining. Unless very highly 

 magnified, they seldom show much sculpture (on the disk 

 at least) except very shallow sulcate impressions visible 

 only in certain lights. To this there is one curious 

 exception in fasciata, Nyl., where the lobes are covered 

 with an intensely fine and close rugulosity, making them 

 absolutely dull. The character is visible even to the naked 

 eye, and I find it equally present in examples of this 

 species from England, Switzerland, S. France, and Italy. 

 In several other species the surface is more or less micro- 

 scopically rugulose, but not enough to prevent it from 

 shining. 



In chrysoscelcs, Kirby, Fig. 13, and also in luccns, Imhoff, 

 the lobes are so broad as to look almost spherical. These 

 species are in this respect extraordinarily unlike any with 

 which one would expect them to agree, such as coitana, 

 Kirby, which has very sharp and divergent teeth to the 

 lobes. In iichcnchi, Mor. (Fig. 11), the lobes are also rather 

 dumpy, but the interior margins being concave towards 

 the apex, give the armature a wholly different character. 



Cmgiolata, Fab. (Fig. 8), is on the whole the most 

 abnormal Andrena armature known to me. Here the lobe, 

 instead of springing abruptly inwards from the process with 



* I have only twice been able to dissect a suerinensis (Fig. 10) and 

 do not know whether the gap between the lobes is always as con- 

 spicnous as in the specimen figured. But the concavity of their 

 inner outlines evidently makes it impossible that they should ever 

 be completely adjacent. 



