in 17 Osmia-species of the adunca-6rro?,6p. 173 



somewhat like that of cmmentaria. But I do not describe 

 it, as it is a single specimen, and in poor condition. 



Note on the synonymy of four species. 



It seems to me quite impossible that the difformis of 

 Ducke (=pallicornis, Friese) should be identical with 

 Perez's difformis. 



In the former, according to Ducke's and Friese's figures 

 and also my own specimens (Figs. 29, 29a, and 29b), the 

 basal joints of the flagellum are excessively broad as seen 

 in front, and the inferior margins of the basal joints form a 

 series of sharp serrations, while those of the following 

 joints are at least gibbosely dilated. Ducke and Friese 

 also describe the apical joint as acute ("zugespitzt "), and 

 it is so in several specimens belonging to Mr. Saunders, 

 though hardly so (except when showed laterally) in that 

 which I have figured (Asia Minor), (Fig. 29). 



Now of his difformis Perez describes the antenna most 

 minutely, and the following tabulation will show how 

 absolutely it differs from that of Ducke's species — 



Difformis Perez (sec. ipsum). Difformis Perez (sec. Ducke). 



Second joint of flagellum " a peu Second joint at least once and a 



pres aussi large au bout que long." half as wide as long. 



Last joint "once and a half as Last joint quite three times as long 



long as wide, en ovale irregulier." as wide, narrowly conical, tubercu- 



late near base below. (See Ducke's 



Fig-) 



Upper and lower margins of flagel- Lower margin with all the apical 



lum straight " non arrondis comme joints " arrondis " and all the basal 



chez L'O. Morawitzi." sharply serrate. 



Posterior "saillies" of flagellum "Saillie" on joint 2 not more 



most marked on joints 2-4, hardly marked than those on 5-6, which are 



indicated on 5-6, redeveloped on acute and prominent, more so than 



joints following. on any of the joints following. 



Joints 5-6 narrower than those Joints 5-6 as wide or rather wider 



adjoining. than those adjoining. 



Flagellum evidently twice bent Flagellum almost imperceptibly 



"en arriere puis en avant," the first bent between joints 6, 7 and again 



bend occurring " au niveau de " joints between joints 8, 9. (See Ducke's 



5-6. Fig. b.) 



(For a flagellum really answering 

 to this description see my Fig. 28a.) 



In every one of these items except the last the two 

 sides of the table contradict each other absolutely, and 

 even in that their agreement is imperfect. 



Furthermore, Ducke says in a footnote that an "angeb- 

 lich typisches" pair of difformis sent by Perez to Friese 

 were not difformis and must have been sent as such by 

 mistake. He adds that Perez's description (though not 



