268 Annals Entomological Society of America [Vol. X, 



curve of each species. While these formulae are not considered 

 to be of primary importance, they at least remain fairly con- 

 stant for each species where a large number of measurements 

 have been plotted. Where it was possible to use only a few 

 measurements, the formulae of the mean curves of those species 

 would probably vary to a slight extent if more measurements 

 had been used. In all cases as many measurements as possible 

 were plotted, ranging from only two or three to over sixty. 



The writer does not merely characterize the various new 

 species of coccids upon the basis of the antennal segments alone, 

 but in all cases they formed the working basis for their identi- 

 fications. One thing worthy of note is that all the species of 

 Pseudococciis known to occur in Missouri have the last antennal 

 segment the lotigest, as is shown by the antennal formulae of 

 the mean curves of those species, or by the mean curves them- 

 selves. On the other hand, most of the remaining species do 

 not have the distal segment the longest. 



The new species of scale insects mentioned in this paper are 

 fully described, figured, and discussed by the writer in his 

 manuscript on the Coccidae of Missouri. They will later be 

 published in a Missouri Agricultural Experiment Station 

 bulletin, so that the exact distribution, food plants, and further 

 distinguishing characters of these new species will be forth- 

 coming in the near future. 



BIBLIOGRAPHY. 



(1) Marlatt, C. L. April, 1899. Remarks on Some Recent Work on Coccidcc; 



Proceedings of the Entomological Society of Washington; Vol. 4, pp. 383-389. 



(2) Thro, Wm. C. 1903. The Genus Lecanium; Cornell Experiment Station Bul- 



letin No. 209; plates 5; pp. 206-227. 



(3) Smith, P. E. 1911. Some Specific Characters of the Genus Pseudococciis; 



Annals of the Entomological Society of America; Vol. 4, part 3; pp. 309-327; 

 tables 15. 



(4) CocKERELL, T. D. A. 1913. P/?eMacoccM5 fte/Ae/i Again; Canadian Entomologist; 



Vol. 45, pp. 14-15. 



(5) Smith, P. E. 1913. Some Specific Characters of the Genus Pseudococciis; 



Journal of Entomology and Zoology; Vol. 5; part 2; pp. 69-84; tables 5; 

 figures 17. 



(6) Brain, C. K. 1915. In Transactions of the Royal Society of South Africa; 



Vol. 5; part 2; pp. 65-194. 



