170 



MISS JOAN B. PROCTER ON THE 



cream-colour, which brings it out very sharply. On the body this 

 series is well defined. 



The fourth or latero- ventral series is never present on the body, 

 and not always upon the head. It is evidently a most primitive 

 character, which has disappeared in many specimens. In the 



Text-figure 1. 



most marked form this series only consists of three or four black 

 spots on the lower labials, and one larger spot which has become 

 confluent with the post- ocular streak. This latter spot is the 

 last of the series to disappear, and is entirely the cause of the 

 apparent broadening and lengthening of the post-ocular streak in 



