46 Psyche [June 



but this antagonism is much more evident in animals that do not 

 die after a bacterial infection, i.e., animals which are immune. 



If it were only possible to inject an insect more than once without 

 producing fatal results, I am sure one could obtain still more in- 

 teresting results. I have often made two trials but grasshoppers 

 and caterpillars, at least, do not seem able to overcome the effects 

 of a second injection. 



Summary. 



1. Entomological text-books emphasize the importance of 

 phagocytosis in ridding the insect body of foreign matter, but in 

 reality insect blood cells are visibly rather passive. 



2. Grasshopper and caterpillar blood cells do not seem to pha- 

 gocytise bacteria in an amseboid fashion. 



3. When bacteria are found within the blood cells, they may have 

 gained entrance through their own aggression or physical factors 

 may have been involved. 



4. The blood of normal insects, however, is somewhat antago- 

 nistic towards bacteria. 



5. This antagonism acts extracellular ly. 



6. Actively immunized grasshopper blood shows a high degree of 

 antagonism towards the bacteria used in producing this immunity. 



7. An agglutinin was found in immune grasshopper blood. 



8. Some quantitative data on the bacteriacidal action of im- 

 mune grasshopper blood were obtained. 



LIPEURUS DOVEI NOM. NOV. 



E. A. McGregor. 

 Bureau of Entomology, U. S. Department of Agriculture. 



It was recently brought to my attention by Dr. A. Hassall 

 through Dr. L. O. Howard that in naming Lipeurus lineatus^ 1 

 have used a preoccupied name.^ Therefore, as a substitute for 

 L. lineatus I propose, as above recorded, the name L. dovei, in 

 honor of Mr. W. E. Dove of the Bureau of Entomology who 

 has been instrumental in collecting several new and interesting 

 species of Mallophaga. 



I PsTCHE, Vol. 24, No. 4, p. 114, 1917. 



i Zeitsch. f. Ges. Naturw., Vol. 28, p. 384, 1866. 



