COLORATION IN POLISTKS. 



59 



With respect to the pattern of the metathorax, the specimens fall 

 into five classes : 



Class I. Red-brown, with or without parallel yellow stripes. 



Class 2. Red-brown, with black in the median furrow, and perhaps in 

 two points at the anterior end of the red zones which border the furrow 

 laterally. 



Class 3. Black and red-brown about equal in amount. This condi- 

 tion is brought about by the spread of the black from the points above 

 indicated. 



Fig. 21. — Expresses similar relation as in fig. ig for material from Gotha, Fla. 



Class 4. Black extended to obscure all but two red-brown lines, 

 which occasionally are tinged with yellow. 



Class 5. Entirely black, with occasional slight traces of yellow in the 

 zone of the median stripes. 



The distribution of material in these classes is shown in the following 

 table. Classes according to the second abdominal segment are arranged 

 horizontally, class 6 being included with i, and o with 5, according to 

 the metathorax, vertically. 



