136 
Psyche 
[June 
strongly hypognathous, while that of Cerylon is opisthognathous with 
entognathous stylets. It is less likely that either larval type would be 
predaceous. It is hoped that observations on living specimens will 
provide more information on the feeding habits of both larvae and 
adults. 
The evolution of piercing-sucking mouthparts has occurred at least 
two more times in the Coleoptera. Leiodid beetles of the genus 
Myrmecholeva Lea, which occur with ants in Australia, have a 
relatively robust, piercing beak and prognathous head, and they may 
be predators on ant larvae. The maxillary stylets are well-developed 
and blade-like in this group, but the mandibles are much shorter than 
the beak and do not appear to function as piercing organs. In the 
family Eucinetidae, members of an undescribed genus from the New 
World are extremely small (less than i mm.) with a hypognathous 
head and a labral-labial beak with an opening of about 5 microns; 
the mandibles in these insects are even further reduced, but the max- 
illary stylets are very long and fine. A detailed comparison of pierc- 
ing-sucking feeding mechanisms in beetles will be included in a paper 
now in preparation by J. F. Lawrence and T. F. Hlavac. 
We would like to thank those individuals and institutions who 
made their collections available to us. In the following list abbrevi- 
ations in brackets are those used in the text: Fred Andrews, Sacra- 
mento, Calif. [FA] ; California Academy of Sciences, San Francisco, 
Calif. (D. Cavanaugh, H. B. Leech) [CAS] ; D. S. Chandler, 
Columbus, Ohio [DSC] ; Henry F. Howden, Ottawa, Canada 
[HH] ; Field Museum of Natural History, Chicago, 111. (H. S. 
Dybas) [FM] ; John F. Lawrence, Cambridge, Mass. [JL] ; Mu- 
seum of Comparative Zoology, Harvard University, Cambridge, 
Mass. [MCZ] ; Ohio State University, Columbus, Ohio (C. Triple- 
horn) [OSU] ; Karl Stephan, Tucson, Arizona [KS] ; Walter 
Suter, Kenosha, Wise. [WS] ; William Tyson, Fremont, Calif. 
[WT] ; University of Arizona (F. G. Werner) [UAZ] ; United 
States National Museum, Smithsonian Institution (J. Kingsolver) 
[USNM]. The following persons have made a special effort to 
collect cerylonids and other cryptic beetles and have provided much 
of the material used in this study: D. Chandler, A. Newton, S. 
Peck, and W. Suter. We are grateful to R. Crowson, J. Doyen, 
T. Hlavac, A. Newton and R. Silberglied for advice given during 
portions of this study. We also wish to thank Virginia Phear, 
Marilyn Pearce, Jennifer Slade, and Margaret Thayer for typing 
and proofing, and to F. M. Carpenter for a critical reading of the 
manuscript. 
