272 PROCEEDINGS OF THE ACADEMY OF [Junf\. 



5. G. densaraeolatus Montg. 



I^Wj^oming, Montana, California; evidently a Western form. 



6. G. platyoephalus Montg. 



Ungava (Canada), Guatemala; and in the United States from 

 Pennsylvania and Montana. 



7. G. violaceus Baird. 



California. I doubt whether this is tenable, since the diagnosis is 

 meagre and males are unknown. 



8. G. longareolatus Montg. 

 California. 



9. G. alasoensis Montg. 

 Alaska. 



10. Chordodes morgani Montg. 



Maryland, Pennsylvania, Michigan, Ohio, Florida, Iowa, Nebraska. 

 Fairly common in the eastern portion of the United States. 



11. C. occidentalis Montg. 



Sonora (Mexico), and California, Arizona, Montana, Texas, Wyo- 

 ming; on the western part of the continent this replaces the preceding. 



12. C. dugesi Gamer. 



Vera Cruz, Mexico. 



13. C. griflBnii Camer. 



Vera Cruz, Mexico. 



14. C. cameranonis Montg. 

 Mazatlan or Panama. 



From the United States there are then known some eleven forms, 

 two or three of which may be found to be untenable. Of these the 

 final hosts are known only for Paragordius varius (a Gryllid, Acheto), 

 for Gordius villoti (Acridiids), for Chordodes morgani (a Blattid), and 

 for C. occidentalis (an Acrid iid). 



