1974] 
Brothers — Protomutilla 
271 
pin. Since the specimen has been remounted from a glued card 
mount, some features of the venter and appendages remain somewhat 
obscured by glue. 
Although Bischoff’s (1915) descriptions are very short, P. micro- 
soma seems clearly to differ from all the amber species. It may be 
most similar to P. nana, but the head undoubtedly differs in form 
from that species. 
The resemblance of P. microsoma to Nanomutilla (Fig. 3) is 
quite remarkable, the most basic difference being the form of the 
pro-mesonotal suture. In addition to gross body form, these species 
have highly similar coloration and puncturation, and all are rather 
small in size. Nanomutilla even has a weakly developed carina on 
the hind coxa as well as pubescent eyes, characters lacking in the 
higher Mutillidae. These marked similarities tend to support my 
conclusions (elaborated in Brothers., 1974) that the Myrmosinae 
should be considered a subfamily of Mutillidae. 
Acknowledgements 
I should like to thank Mr. Christopher O’Toole of Oxford for 
bringing this specimen to my attention, and also Mr. W. L. Overal 
of the Univesitv of Kansas for his help with preparation of the 
manuscript. 
References 
Bischoff, H. 
1915. Bernsteinhymenopteren. Schrift. Phys.-Oekon. Ges., Konigsberg 
56: 139-144. 
Brothers, D. J. 
1974. Phylogeny and classification of the aculeate Hymenoptera, with 
special reference to Mutillidae. Univ. Kansas Sci. Bull, (sub- 
mitted). 
Krombein, K. V. 
1940. Studies in the Tiphiidae (Hymenoptera Aculeata). IV. A re- 
vision of the Myrmosinae of the New World with a discussion 
of the Old World species. Trans. American Ent. Soc. 65: 415- 
465, pi. 24. 
