O. P. Ferris and F. R. Cole 197 
that certain of its hosts are wide ranging forms, both as species and as 
individuals. 
Fig. 13. Pseudolfersia spinifera (Leach), male. From paratype of P. diomedeae Coq. 
W e present the following notes on the morphology of the species. 
Head with no strong fronto-orbital bristles. 
Thorax with the mesonotum almost bare, the scutellum with a marginal 
row of very small setae. Sternum practically entirely bare. The tibiae and 
