iii 17 Osmia-species of the adunca-6rm/^. 171 



Fig. 13. The main lobes shaped like the last, but their 

 apical margins, if possible, even straighter, and the lateral 

 spinosity still more marked. Their pilosity however is 

 very different, being quite short and scanty at the sides. 



The process is most conspicuously "T-shaped," its apical 

 margin running quite transversely with almost no sinua- 

 tion. It is clothed with intensely fine and regular hairs; 

 and the inferior margins of the lobes and the longitudinal 

 interval between their bases is marked by a distinct and 

 well-defined brown stain on the otherwise vitreous sub- 

 stance, which gives the segment a peculiar and seemingly 

 constant appearance in all my specimens. 



This is certainly pallicornis, Friese (= difformis, Ducke 

 nee Perez. See Note at the end of this paper). 



I figure its very curious $ flagellum in Figs. 29, 29a, 

 29b. 



My specimens are from Asia Minor and Syria, Mr. 

 Saunders has others from the Ionian Islands. 



Fig. 14. Exceeding like Fig. 11, but the main lobes 

 have more convex apical margins, and their lateral teeth 

 are even stronger than in difformis. Lateral pilosity (as 

 in Fig. 11) well developed. The lobes of the process are 

 more widely separated at their bases, and the apical 

 margin is decidedly trisinuate (the central sinuation most 

 marked). 



This is a ''typical" specimen from Majorca of insularis, 

 Schmiedeknecht, given to me by Herr Friese. It is 

 evidently a near relation of loti and difformis. 



Fig. 15. Main lobes sharply angled, with deffexed lateral 

 teeth (only conspicuous when the segment is viewed from 

 its apex). Their apical margins unusually concave, running 

 almost in a single continuous curve. 



Process peculiar, the lobes being very parallel-sided 

 (almost oblong) ; set very obliquely — so as to embrace 

 with their apical margins a large triangular gap (the 

 triangle, however, rather right-angled than, as in Figs. 7, 

 etc., acute-angled) ; and clothed, especially at their apices 

 with long incurving hairs. 



My specimens are from Algeria mostly, but a few (quite 

 like the rest) from Jaffa. I believe that they may safely 

 be referred to fertoni, Perez, to whose description they 

 completely answer. They have not the punctuation 

 of his albi-spina which I have seen. The species nests 

 in snail-shells. 



