74 CLAUDE FULLER. 



SO closely applied to each other at half the wing-length that 

 but one rib formed. Wing 123 equally owes its abnormal con- 

 dition to a duplicated medial, both medials being atrophied 

 and the tips of both touching the radial. The venation hei-e 

 illustrates the extra development of the cubital to make good 

 the atroph}- of the medial. Wing 124 owes its condition to a 

 duplicated cubital, as in fig. 99a. 



Wing 125 possesses a remarkable venation which does not 

 give any very direct clue to the pre-existing tracheal tangle. 

 It seems to me, however, to be due, in the first place, to a 

 duplicated cubital, and, in the second place, to the crossing 

 of the medial trachea by the outer cubital, so that the latter 

 ran in between the medial and radial. 



Wing 128 serves to illustrate the result following the 

 crossing of principal tracheas. Here it would seem that the 

 medial was in duplicate, and the two stems crossed, somewhat 

 as they do in fig. 97 (PI. VII), the lower being briefly applied 

 to the cubital. Wing 129 is one which conforms to the 

 generic character for Cryptoter mes, the media "joining 

 the radius at about half the length of the wing." This is a 

 case of the tip of a weak medial becoming applied to the 

 radial. 



Wing 131 suggests a duplicated medial in company with 

 a duplicated cubital, the outer cubital being approximated to 

 the medials. Wing 133 exhibits a duplication of the medial 

 with the two trachea3 more or less atrophied and with the 

 tip of each applied to the radial, the base of one associating 

 itself Avith the radial and of the other with the cubital. 



Wing 134 is a further illustration of a duplicated medial. 



IXc. Ckyptotermes sp. 



Plates IX and X, figs. 135a-154. 



Except that in ninety-nine of every hundred wings of this 

 species the media is found united to the radius at or about half 

 the length of the wing, the structure of the Aving stumps, 

 figs. 135a and 135b (PI. IX), and the relationships of the 



