110 On Gomphine Dragonflies from South America. 



broad, convex ventrally, and ending in a long straight point ; 

 in ventral view widely separated basally, converging and 

 expanding internally until they nearly touch one another at 

 about mid-length, and then narrowing to form a pair of rather 

 slender forceps. Vesicle of the penis black, rather hairy, 

 stout ; the extremity directed backwards. Upper anal 

 appendages yellow, hairy, about as long as segments 9 and 10 

 taken together, broad in the first two-thirds of their length, 

 then narrowing and curving towards one another until they 

 meet or even overlap ; a low superior tubercle at the broadest 

 part of the appendage is followed by an internal expansion 

 which terminates posteriorly in an acute tooth, directed 

 inwards and forwards. Lower anal appendages black, about 

 two-thirds as long as the superior appendages, strongly 

 divergent at their base, and then curving gently inwards, and 

 ending in a sharp hook. 



Zonophora spectabilis presents several points of difference 

 from the genotype and other members of the genus. It has 

 a more southern distribution than any other species yet 

 described, and is further distinguished from all its congeners 

 by the presence of pale spots on segments 8, 9, and 10 of the 

 abdomen. It is likewise the smallest of the known species of 

 Zonophora, and in this respect comes nearest to Z. calippus, 

 Selys. Indeed, Z. calippus and Z. spectabilis are differen- 

 tiated from the more typical forms in other ways, for they 

 share in common certain venational peculiarities from which 

 the larger species are excluded. For instance, they agree 

 with one another and differ from Z. campamdata in the 

 presence of a basal subcostal antenodal in all wings, and in the 

 normal presence of a supplementary cubito-anal cross-vein, in 

 addition to the anal crossing and the base of the subtriangle. 

 In the absence, however, of marked differences in the general 

 design of the external genitalia and anal appendages, it seems 

 advisable to treat Z. spectabilis and Z. calippus as being con- 

 generic with Z. campannkita. 



EXPLANATION OF THE PLATES. 

 Plate VI. 



Fig. 1. Gom])Jioides dentatus, Selys, cf , type. Right wings. G. Severin 



photo. 

 Fig. 2. Ditto. Anal appendages in dorsal view. G. Severin photo. 

 Fig. 3. Gorhphoides distinguendw, sp. n., tf , type. Right wings. G. 



Severin photo. 

 Fig. 4. Ditto. Anal appendages in dorsal view. G. Severin photo. 

 Fig. 5. Ditto. Terminal segments of abdomen and anal appendages in 



dorsal and left prolile view. G. Severin del. 



