X LIST OF ILLUSTEATIONS 



A REVISION OF THE TWO-WINGED FLIES OF THE FAMILY ClUSIIDAE 



By A. L. Melander and Naomi George Argo 



Facing page 

 1-4. Flies of the family Clusiidae 54 



Notes and descriptions of naiads belonging to the dragonfly 



GENUS HeLOCORDULIA 



By Clarence Hamilton Kennedy 



1. Naiads of the dragonfly genus Helocordulia 4 



Fossil insects in the United States National Museum 



By T. D. A. Cockerell 



1-2. Fossil insects in U. S. National Museum 16 



A revision of the Mutillid wasps of the genera Myrmilloides and 

 Pseudomethoca occurring in America north of Mexico 



By Clarence E. Mickel 



1-4. Male genitalia of the ilfwiiiZid wasps. Dorsal view 52 



New North American parasitic copepods, new hosts, and notes on 



COPEPOD nomenclature 



By Charles Branch Wilson 



1. Argulus paulensis and A. nobilis 22 



2. Anchistrotos occidentalis and Parapandarus nodosus 22 



3. Parapandarus nodosus 22 



MORDENITE and ASSOCIATED MINERALS FROM NEAR ChALLIS, CuSTER 



County, Idaho 

 By Clarence S. Ross and Earl V. Shannon 



1. Mordenite, analcite, and argentine 20 



2 . Mordenite masses and amygdaloidal rock, Challis, Idaho 20 



3. Analcite, Argentine calcite, mordenite, and quartz 20 



Notes on cestode parasites of sharks and skates 

 By Edwin Linton 



1. Cestodes of sharks and skates 112 



2. Cestodes of sharks 112 



3. Cestode from sleeper shark 112 



4. Cestodes of sharks and skates 112 



5. Cestodes of sharks 112 



6. Cestode from hammer-headed shark 112 



7. Cestodes of hammer-headed shark, thrasher shark, and torpedo 112 



8. Cestodes of sharks 112 



9. Cestodes of tiger shark and sting ray 112 



10. Cestode from sting ray 112 



11. Cestode frohi blue shark 112 



12. Cestodes of sharks and skates 112 



13. Larval stage of shark cestode encysted in flesh of a teliost 112 



