1911.] 



181 



refer to Prof. Newstead's interpretation of the antenna of Newsteadia ^ 

 He remarks (Mon. Brit. Coccidae, vol. ii, p. 242) : " With reference to 

 the antennae, Mr. Grreen says that ' the terminal joint is apparently 

 composed of two fused joints, forming a scape-like termination ; the 

 antennae thus consisting of seven distinct joints as opposed to eight in 

 the other species. . . . Another remarkable character in floccosa is the 

 very long basal joint of the antenna.' In ascribing seven joints to the 

 antennae, Mr. Green has evidently overlooked the true character of 

 the third joint, which, although deeply constricted in the centre, is not 

 articulated ; the constriction, however, so exactly simulates a joint 

 that it may easily be mistaken as such." 



Prof. ISTewstead is quite correct in asserting that there is no true 

 articulation between what I considered as the 3rd and 4th joints and 

 what he takes to be a single 3rd joint with an illusory constriction. 

 Tliere certainly is no articulation between these two joints — or nodes, 

 as the case may be. But I do not agree with the view that this, of 

 itself, deprives the part of its right to be considered a separate joint. 

 In many Lecaniinx there is no actual articulation between certain of 

 the recognized joints. It is sometimes difficult to decide whether a 

 manifestly compound segment shovdd be reckoned as one or more 

 joints. In practice, it is usual to consider such a segment as con- 

 sisting of a single joint when the transverse divisions have completely 



