AGRTON. 19 



green ; posterior margin of the prothorax, with the middle lobe 

 small, rounded; dorsum of the thorax black, each side of it a green 

 stripe ; sides green, with a small black stripe at the wings ; feet 

 pale, exteriorly, in part, lineated with black ; abdomen very slen- 

 der, brassy-black, the sides and a basal annulus upon segments 

 3 6 yellowish -green; apical half of 8, and 9 entirely blue; a 

 stout process upon the margin of the tenth segment, which is two- 

 horned; appendages short, superior ones black, trigonal, obtuse; 

 inferior ones yellowish, longer, two-parted, the external branch 

 broader, trigonal, the internal branch longer, cylindrical, ungui- 

 culated, strongly recurved ; wings hyaline ; pterostigma small, 

 yellow, in the middle fuscous. Six to eight postcubital cross- 

 nervules. Male. 



Length 22 millims. Alar expanse 21 millim. 



Hob. Porto Rico, Brazil. 



Almost the smallest species known. 



9. A. aduncum ! 



Agrion aduncum Hagen ! 



i 

 Black, varied with yellow ; head black, in front and an occipital 



spot which is cuneiform, each side, yellow ; posterior margin of 

 the prothorax rounded; dorsum of the thorax luteous, with a broad 

 medial, $ack stripe ; sides luteous ; feet luteous, exteriorly lineated 

 with black ; abdomen very slender, brassy-black, the sides, and a 

 basal ring, which is excised iu the middle, yellow, upon segments 

 3 8; 910 blue (J"), or 9 at the sides and 10 entirely luteous 

 (9); appendages very short, the superior ones longer, biparted, 

 the external branch cylindrical, obtuse, straight; the internal 

 branch slender, curved downwards ; the inferior appendages obtuse, 

 emarginated at the apex; 9 apex of the tenth segment cleft; the 

 appendages obtuse, luteous ; eighth segment with an acute ven- 

 tral spine ; wings hyaline ; pterostigma small, rhomboidal, luteous, 

 fuscous in the middle. Nine postcubital cross-nervules. 



Length 26 millim. Alar expanse 26 millim. 



Hob. Cuba. 



10. A. discolor. 



Agrion discolor Bunn. ! Handb. II, 819, 8. 



Uniformly testaceous, or with the dorsum rosy, or brassy-black; 

 thorax two-striped ; pterostigma pale. Female. (From Burmeis- 

 ter's description.) 



