312 KELLOGG AND BELL 



this is a new species) the following conditions with regard to 

 the variation in actual and relative lengths of the antennal seg- 

 ments was noted : writing out the formula for each antenna in 

 the series (a total of 50, two antennae on each individual), based 

 on careful measurements with micrometer, and comparing these 

 formulas, it was found that no two formulce agree, and that 

 there was practically as much variety in these formulae as there 

 is among the eleven formulae published as specifically diagnostic 

 for eleven North American species of the genera Ccrofiito and 

 Phenacocciis. 



The formulae for the 50 antennae of the 25 individuals are as 

 follows : 



1. L. broken. 14. L. (9, 3), (i, 2), S, 7, 5, 6, 4. 

 R. 9, 3, 2, (I, S), (6, 7), (4, 5). R. 9- 3> (I, 2), (5, 4. 8), (6, 7). 



2. L. broken. i5- L. (9, 3), 2, i, 8, 7, 6, 5, 4. 

 R. 9, 3, 2, I, (4, 8), (5, 6, 7). R. 9> 3, 2, (i, 7, 8), (4, 5- 6). 



3. L. 9, 3, 2, (I, 5, 8), 4, (6, 7). 16. L. 9, 3, 2, 1/(5, 8), 6, (4, 7). 

 R. 9, 3, (I, 2), 8, (4, 5, 6, 7). R. 9, 3> (i^ 2, 8), (4, 5, 6, 7). 



4. L. (8, 3), (i, 2, 7), (4, 5, 6). 17. L. broken. 



R. (8, 3), 2, (I, 7), 6, (4, 5). R. (9. 3), 2, (I, 8), (4, 5, 7). 



5. L. 9, 3, 2, I, (5, 6, 7, 8), 4. 18. L. broken. 

 R. 3, 9, 2, I, (7, 8), 5, 4, 6. R. broken. 



6. L. (9, 3), (I, 2), S, (4, 5, 6, 7). 19- L. (9, 3), 2, I, 8, 4, 7, (6, 8). 

 R. 3, 9, 2, (i, 5, 8), 4, 6, 7. I R. broken. 



7. L. 9, 3, 2, I, (4, 7, 8), (5, 6). 20. L. 9, 3, 2, I, (7, 8), (4, 5, 6). 

 R. 9, 3, 2, 1, 4, (5, 6, 7, 8). R. 3. 9. 2, I, 8, 7, (4, 6), 5. 



8. L. broken. 21. L. 9, 3. 2, 8, (i, 4, 5, 7), 6. 

 R. (9, 3), (I, 2), 8, (4, 5, 6, 7)- R- 9. 3. 2, (5, I, 8), (4, 7), 6. 



9. L. broken. 22. L. 3, 8, i, 4, 2, 7, (5, 6). 

 R. (8, 3), I, 5, 2, (4, 7). R. 3' 8, 4, (I, 2), (5, 6, 7). 



10. L. 3, 9, (I, 2), 5, (4. 7> 8), 6. 23. L. 9, 3. 6, (i, 7- 8), 6, (4, 5). 

 R. 8, 3, 4, (I, 2), 7, (5, 6). R. 9, 3. 2, I, (6, 7. 8), (4, 5). 



11. L. (9, 3), (i, 2), (7, 8), (4, 5,6). 24. L. broken. 

 R. 9, 3, 2, 5, 8, (4, 5, 6, 7). R. broken. 



12. L. 9, 3, (I, 2), 8, 7, (4, 5, 6). 25. L. 3, 9, (I. 2), (4, 5. 6, 7, 8). 

 R. 9, 3, I, (2, 8), (5, 7), (4. 6). R. 9. (2, 3), I, (4. 5, 8), 7. 6. 



13. L. 8, 3, (2, 4), I, (6, 7). 5. 

 R. (8, 3),4, 2, 7, (1,5. 6). 



In actual lengths the antennal segments varied as follows, 

 (only the range given) : Seg. i, 4-7 ; seg. 2, 4-8 ; seg. 3, 6-1 1 ; 

 seg. 4, 3-8; seg. 5, 3-5 ; seg. 6, 3-4 >^ ; seg. 7, 3-5 >< ; seg. 



