Rev. F. D. Morice on Armatures, etc. of Andrena. 287 



outlines approaching each other like the sides, not of an 

 arch, but of a triangle. And in some species (Fig. 18, so 

 also in/wZ-ya, Schr. and others) there is a marked sinuation 

 inwards of the exterior margin, because the process is 

 creased, not doion, but wp. This character makes the 

 process still more resemble a leaf with its petiole. The 

 crease is upwards also in the extraordinary cingulata 

 (Fig. 8.) In fuhicrus, Kirby, the process is so folded as to 

 produce a little subapical notch in its exterior outline 

 (Fig. 5). By this character the species can be distinguished 

 at once. I have seen it in countless specimens from all parts 

 of Europe, and never known it to fail. 



The very elongate and narrow-looking processes of Fig. 9 

 hucephala, Steph., and Fig. 10 sucrinensis, Friese, are 

 conspicuous at once. In neither insect is the type of 

 armature at all like that of other species which one would 

 suppose to come near it. Bucephala $ is excessively like 

 megace])liala, Smith, in most characters, but megacephcda has 

 a perfectly normal armature, and, as will be seen hereafter, its 

 8th segment is also normal while it is very eccentric in 

 hucephala. The rare ferox, Smith, I have never had a chance 

 of dissecting. It would be interesting to know whether its 

 terminal characters resemble those of hucephala. As to 

 sucrinensis its propodeal sculpture, etc., would place it near 

 tibialis, Kirby, pilipes, Fab., etc. But these species, and also 

 himaculata, Kirby, with all its varieties {Magrettiana, 

 Schmied., etc.) have the wholly different type of armature 

 shown in Fig. 23. Here the dentate angles of the lobe are 

 excessively sharp, divergent, and much deflexed. The sinua- 

 tion of its apical margin is almost continued into a perfect 

 circle by reason of a sort of rounded tubercle on the inner 

 margin of the process ; above which tubercle comes another 

 semicircular sinus, the outline of the two sinuations and the 

 tubercle together forming a sort of " figure three " (3), which 

 alone would distinguish this type of armature from all the 

 normal ones. The apical creasing is also quite peculiar,dowu- 

 wards, but longitudinal (not diagonal or transverse) in its 

 direction, so that the actual " dog's-ear " is quite narrow, 

 and the apical part of the process as a whole is so fore- 

 shortened as to look somewhat triangular. This is one of 

 the comparatively few cases, in which a number of 

 evidently nearly related species have one very distinct and 

 practically identical type of terminal segments. But different 

 as are these characters in sucrinensis, Friese, I should 



TRANS. ENT. SOC. LOND. 1899.— PART II. (JUNE) 16 



