publication of " Jurinean " Genera of Hymenoptera. 427 



the Methode as representing Trachusa, (viz. cincta Jrn,, 

 Pf. 12'36 — a Dioxys Lep.) one of the original types. 



The real Type of Trachusa Jrn. (1801) can only be an 

 Anthidium F. (1804), an Osmia Pzr. (1806), or a Stelis Pzr. 

 (1806), and as Trachusa antedates all these names one of 

 them must give place to it. 



Osmia and Anthidium are both very long genera — 

 Ducke in 1900 monographed 266 Palaearctic species of 

 Osmia, and Friese, in 1898, 148 Palaearctic species of 

 Anthidium., whereas Friese only records 22 forms of Stelis 

 in 1895 (including varieties and synonyms). Clearly, 

 therefore, by far the least inconvenience will be caused 

 by retaining the names Anthidium and Osmia in their 

 present senses and sinking only the somewhat less familiar 

 Stelis Pzr. In justification of this method of meeting 

 the difficulty, we may add that Stelis is a parasitic 

 genus resembling in habits, and more or less in structure, 

 Dioxys, and that the figure by which Jurine elected to 

 represent his Trachusa in the Nouvelle Methode (Plate 12) 

 is the figure of a Dioxys. We do not contend that Jurine 

 had any idea of restricting the Type of Trachusa to the 

 parasitic forms included in it, but by choosing one of these 

 to supply his figure he shows at least that he regarded 

 them as not otherwise than typical. 



Stelis, then, becoming a synonym of Trachusa, its Type 

 aterrima Pzr. (the only Stelis included among the original 

 exponents of Jurine's genus) becomes the Type of Trachusa 

 also. 



The species m-aculata F. is a synonym of manicata. L. 

 (cited by Latreille in 1810 as the Type of Anthidium F.) ; 

 hicornis, rufa, cornigera, and fronticornis are all different 

 names for one species, viz. hicornis L. ; and fusca is a 

 synonym of Osmia bicolor Schrk. {hicornis L., F., was cited 

 by Latreille as the Type of Osmia Pzr., in 1810). 



{^Taurus F. (ined.), associated with fronticornis Pzr. 

 in the Erlangen List, 1801, is homonymous with Taurus 

 Storr (1780) Mamm.] 



DiPHYSis Lep. (1841) 

 = *Trachusa {nee Jrn.) Auctt. 



Type: Trachusa serratulae Pzr. 86*15 (= pyrenaica Lep. ; Lep. 

 1841). 



DiPHYSis Lep. HN. Ins. Hym. 2. 307-9 sp. 1 (1841)— Type: 

 serratulae Pzr. (= fyrenaica Lep.). 



