320 Annals Entomological Society of America [Vol. IV, 



Prothoracic Legs. In crawii Coq. and citri Risso the third 

 segment is always the longest, the fourth segment coming next 

 in order. In the remaining three species the third segment is 

 usually the longest but may be equal to or less than the fourth 

 segment. The first segment is always third in order in the 

 formulae. In no species does the second segment bear any fixed 

 relation to the fifth. The sixth segment is always much the 

 shortest and comes last in order in^ the formulae. 



Mesothoracic Legs. In crawii Coq. the third segment is 

 always the longest. In the other species the position of the 

 third and fourth segments vary in relation to each other. The 

 first segment always comes third in the formulae. The second 

 and fifth segments vary in relation to each other in each of the 

 species. The sixth segment always comes last in the formulae. 



Metathoracic Legs. In obscurus Essig and citri Risso the 

 fourth segment is usually longer than the third. In obscurus 

 Essig an exception is seen to this in the right leg of Specimen 

 XL In obscurus Risso an exception is seen to this in specimen 

 VII. In the other species the fourth segment is always longer 

 than the third. The first segment always comes third in the 

 formulae. In no species do the second and third segments bear 

 any fixed relation to each other. The sixth segment is always 

 much the shortest and comes last in the formulae. 



It will be seen from the above discussion that the variation 

 in the formulae is too great for them to be of service in specific 

 determination. Exceptions are found to any generalization 

 that might be made. The limits within which there can be 

 variation are so small that the variations are almost sure to 

 go beyond these limits. Other parts of the legs as setae, 

 digitules, etc., apparently offer no characters of a specific 

 nature. 



