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



hesitate on that account to remove it from their company. 

 So also witli e/phippmm, Spin, (which in propodeal, and also in 

 terminal characters, shows some degree of affinity to siieri- 

 nensis, but in the latter at least is quite \xn\\ke jjilipes, etc.). 



In a species which I believe to be circinata, Dours (Fig. 

 20), the process has a singularly constricted and hook-like 

 tip. Exactly the same character occui's in a red species 

 which I have taken in Algeria. According to Lucas's 

 collections at Paris this would seem to be rvjiventris, Lep. 

 These two species have also similar and most abnormal 

 'valvulas ventrales,' which are shown in PlateVI,Figs.l4, 15. 



The 8th segment. The characters of this segment lie 

 partly in its outlines, and partly in its pilosity. In one or 

 both of these respects some species may be considered 

 normal and others ^wrfa^oicim/. 



Perhaps as simple and common a form as occurs is 

 shown in Fig. 4, megacephala, Smith. Here the constriction 

 from "plate " to " yjrocess " is uniform, causing no violent 

 sinuation in the outline (as in Fig. 10). The process is of 

 normal length and breadth, and equally broad throughout, 

 except just at the base and apex, where it dilates very 

 slightly. The moderate geniculation (only to be recog- 

 nised in this view as being the base from which the 

 jailosity springs) is about half way between the base and 

 apex of the segment. The apex is slightly bilobed, which 

 is the most usual condition ; but this character is apt to 

 vary within the limits of a single species. The pilosity is 

 perfectly simple, with a regularly oval exterior outline, 

 forming neither tufts nor separate fringes anywhere, but 

 covering the whole process uniformly, just passing its apex, 

 but extending a good deal further beyond its sides. 



The above description would suit with little alteration 

 all such species as I should consider normal. Any very 

 conspicuous deviation from its characters marks a species 

 as paradoxical. Thus, considering first the outline : I 

 should say that a more or less paradoxical condition arises 

 whenever tho process is extremely long and thin through- 

 out (Plate VII, Fig. 5a) or the reverse, or is violently 

 dilated or constricted at any point, or has markedly 

 divergent or convergent outlines from base to apex. So 

 again when the constriction from plate to process is violent 

 or uneven, causing marked sinuations or "shoulder" like 

 projections in the outline (Plate VII, Figs. 1, 2,) or creating 

 a long parallel-sided " neck " between the geniculation 



