X LIST OF ILLUSTEATIONS 



On fossil turtles from the Pleistocene of Florida 



By Charles W. Gilmore 



Facing page 



1 . Carapace of Terrapene singletoni, new species 10 



2. Carapace of Terrapene canaliculata Hay 10 



3. Carapace of Terrapene canaliculata Hay 10 



4. Carapace of Terrapene canaliculata Hay 10 



5. Plastron of Terrapene canaliculata Hay 10 



Some peculiar fossil forms from Maryland 

 By Wendell C. Mansfield 



1. Views at and below Langley's Bluff, St. Mary's County, Md 10 



2. Xenohelix marylandica Mansfield ■ 10 



3. Xenohelix marylandica Mansfield 10 



4. Irregular forms associated with Xenohelix marylandica Mansfield 10 



5. Cylindrical forms from below Langley's Bluff . 10 



The Maskell species of scale insects of the subfamily Asterole- 



caniinae 



By Harold Morrison and Emilj- Morrison 



1-29. Maskell species of Asterolecaniinae 37-65 



The geology, petrography, and mineralogy of the vicinity 

 of Italian Mountain, Gunnison County, Colorado 



By Whitman Cross and Earl V. Shannon 



1. Barite, diopside, and scapolite 42 



2. Vesuvianite, chabazite, and stilbite 42 



The Aj«erican moths of the genus Diatraea and allies 



By Harrison G. Dyar and Carl Heinrich 



1 . Abdominal tufts and male genitalia of Diatriaea 48 



2-7. Male genitalia of Diatraea 48 



8. Male genitalia of Diatraea, Doratoperas, and Xanthopherne 48 



9. Male genitalia of lesta, Trinidadia, Hemiplatytes, and Chile 48 



10. Male genitalia of Alamogordia, Platytes, and Diatraenopsis 48 



11. Male genitalia of Haimbachia 48 



12. Male genitalia of Haimbachia, Xubida, and Occidentalia 48 



13. Male and female genitalia of Silveria, lesta, and Trinidadia 48 



14-17. Female genitalia of Diatraea 48 



18. Female genitalia of Haimbachia 48 



19. Female genitalia of Xanthopherne, Haimbachia, and Doratoperas 48 



20. Female genitalia of Diatraenopsis, Xubida, Occidentalia, and Hemi- 



platytes 48 



Pycnodesma, a new molluscan genus from the Silurian of 



Alaska 



By Edwin Kirk 



1 . Views of Pycnodesma giganteum, new species 10 



2. Pycnodesma benjamini, P. giganteum, Megalodon cucullatus and Megalo- 



mus canadensis _ jq 



