138 AMERICAN HYMENOPTERA. 



arctice, but there is also variation of the radius angularly 

 broken as shown in flavohisais and others. The shape of the 

 radius is therefore quite variable, like the other characters 

 considered above, For these reasons and from general ob- 

 servation and comparison I believe that the species are too 

 closely related, and the diverging characters as yet too vari- 

 able to permit their separation into two genera. I have there- 

 fore united the two genera, Eremotyhis and Allocamptus, under 

 Ereniotyhis Forster, the oldest valid generic name. 



Forster, when proposing Eremotylus in 1868, gave its 

 generic characters in a table but designated no species under 

 it, and none was placed there till 1889, when Brauns desig- 

 nated Eremotylus marginattis Jur. (Arch. Nat. Meckl., 43, p. 

 98). The genus Allocamptus, was proposed by Thomson in 

 1888 as a subgenus of Enicospllus, and Ophion undulatus Grav. 

 was placed as a member. In 1889 (Arch. Nat. Meckl., 43, 

 p. 97) Brauns raised it to generic rank including the same 

 species.* 



The generic name Allocamptus was, however, preoccupied 

 by Allocamptus Forster 1868, and as a homonym can not 

 stand even though the latter has proved to be a synonym 

 a Enicospihis Steph.t 



Kriechbaumer recognized this fact, and in 1901 (Zeitsch. 

 Hym. Dipt., I, p. 18) proposed the name Cy7natoneura, which 

 should supersede the generic name Allocamptus Thoms. if 

 that genus was valid. In uniting these two genera I have 

 followed the International Code of Nomenclature (Art. 28), 

 by which " a genus formed by the union of two genera or 

 subgenera takes the oldest valid generic name of its com- 

 ponents. If the names are of the same date, that selected by 

 the first reviser shall stand," and have preserved the generic 

 name Eremotyhis Forster, considering that since the name 



* This description of the genus Allocamptus Thoms. and designation 

 of type are given in the same volume, only one page ahead of a de- 

 scription of — not the original— and designation of the type for the 

 genus Eremotylus F'orster, 



t Internat. Code Nom., Arts. 34, 36; "A generic name is to be re- 

 jected as a homonym when it has previously been used for some genus 

 of animals." 



