260 



CLASSIFICATION 



[CH. 



Subfamily 1. Gomphinae. 



Triangles short or moderately so, that of hindwing slightly more elongated 

 than that of forewing. Subtriangles present in all wings. Median space 

 always free. Anal loop absent or rudimentary. Eyes quite separate; 

 epicranium ending posteriorly in a sharp occipital shelf. Labium with 

 median lobe complete, not incised. Inferior appendage of male strongly 

 bifid. Ovipositor of female reduced to a pair of valvula vulvae at end of 

 eighth sternite. 



Larva with variably-shaped abdomen. Legs modified for digging, fore 

 and middle tarsi 2- jointed. Antennae reduced to four joints, and more or 

 less swollen. Mask with flat median lobe, lateral lobes with narrow rounded 

 apex and strong movable hook. Gizzard with four elongated fields, carrying 

 numerous undifferentiated teeth. Gills simplex ; undulate or papillate. 



Tribe 1. Ictinini (fig. 117). 



Moderate to large-sized Gomphinae with triangles crossed, at least in one 

 pair of wings. Membranule present or absent. Distal side of triangle often 



Fig. 117. Wings of Ictinus australis Selys, <$, Queensland. 

 (Hw. 38 mm.) Original. 



distinctly broken near distal angle. Larva of variable shape. A heterogeneous 

 tribe including two series : 



Series 1. Gomphoides-Series. Membranule absent or reduced. Larva 

 with elongated abdomen. New World (except Davidius and Sieboldius). 



Series 2. Ictinus-Series. Membranule distinct. Larva with short rounded 

 abdomen (fig. 36 A). Old World (except Cacus). 



