EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 1. Gomphus vulgatissimus; 6, labium; c„ appendices. 

 2. Herpetogomphus ; b, labium ; c, side view. 



■• 3. Gomphus pilipes V a, side view ; b, labium ; c, appendices. 

 ■ 4. Ictinus ; a, side view ; b, labium ; c, appendices ; d, lateral border of the abdomen ; e, the 



same (the tip) more magnified. 

 '■ 5. Gomphoides, species No. 10; a, side view; b, labium; c, appendices; </, head. 



PLATE II. 



Fig. 1 . Macrogomphus spiniceps ; a, side view ; b, head ; c, two last joints of the antenna. 



" r 2. Gomphus, species No. 7 ; 6, labium; c, the same (the tip) more magnified ; d, bristles of 



the labium border. 



•' 3. Progomphus ? ? a, side view ; b, labium ; c, bristles of the labium border. 



4. Gomphus, species No. 4 ; b, labium, 



o. Gomphus, species No. 5. 



6. Gomphus, species No. 6 ; b, labium. 



PLATE III. 



Fig. 1 . Cordulegaster bidentatus ; o, side view.; b, labium ; c, head ; </, bifid tip of the labium. 



2. Cordulegaster Sayi. 



" 3. Cordulegaster annulatus ; b, appendices. 



" 4. Ha»enius brevistvlus : a, side view ; c, head ; </, wing-cover. 



" 5. Hagenius Japonicus ; c, head. 



