EXPLANATION OF PLATE XXXTII. 



JIeteroiiieh>ii'm itrgevted Macquart. 

 F'io-. 1. Tlie Jiiale. 

 ,, 2. The side view of the head of tlie male. 

 ,, 3. The female. 

 ,, 4. The side view of the head of tiie female. 



Note. — f'i|JS. 2 and 4 were inadvertently dra"WTi to face the same direction 



as figs. 1 and 3. 



