THE SFBFA:\IILY LIBELLULIN.E. 341 



Notwithstanding these differences, I am not at present inclined to treat any oi these 

 specimens (all of which are males, the only female being described above) as specifically 

 distinct. 



Cajstjackia batesii. (Plate UII. fig. 1 ; appendages, Plate LVII. fig. 9.) 



Long. corp. 48 millim. ; exp. al. 80 millim. ; long. pter. 4 millim. 



Head and thorax yellowish (probably green when alive) ; tips of mandibles, suture 

 of labium, and legs black. Abdomen rufo-testaceous, with a black dorsal band, 

 commencing at the end of the third segment, and covering the middle of segments 

 4-9, and widened at the end of each segment to cover the whole width. Wings 

 brownish hyaline, more or less tinged with smoky yellow, especially towards the costa ; 

 pterostigma yellow, below slender black nervures. 



Hah. Amazons. 



Caxnaphila insulaeis. 



Long. Corp. 37 millim. ; exp. al. 67 millim.; long. pter. 4 millim. 



Female. ^F'a.cQ yellow, frontal tubercle and middle of clypeus violet; jaws, a large 

 square spot at the base of the labium, and the back of the head black, the latter with 

 a double yellow spot behind the occipital triangle, three spots on each side behind the 

 eyes, and a yellow crescent at the base. Thorax chocolate-red, shading into coppery 

 green at the sides, with slender yellow lines on the median suture, on each shoulder 

 (interrupted), and slightly on the hinder sutures ; pleura yellow, with wide coppery- 

 green bands, interrupted by yellow lines on the lower part of the sutures ; the space 

 between the wings spotted with yellow, space behind the legs marked with large yellow 

 spots, divided and separated by chocolate-red. Legs black, front femora yellow 

 beneath, and middle femora slightly lined with yellow. Abdomen brownish red, a 

 little yellowish at base ; the sutures, lateral carinae, and ninth segment, except a spot 

 on each side, black. Wings hyaline, slightly tinged with yellowish at the base, and 

 brownish at the tips ; pterostigma reddish brown, between black nervures. 



The male difi'ers little, except in being pulverulent blue. 



Hah. Haiti (types in British Museum) ; Jamaica (Dublin Museum). 



Acisoma(?) trifioa. 



Long. corp. 26 millim. ; exp. al. 47 millim. ; long. pter. 3 millim. 



Male. — Head black ; the upper part of the front, the nasus, a large spot on each 

 side of the mentum, the base of the mandibles, and two spots on each side behind the 

 eyes whitish or yellowish. Thorax black ; the pleura with numerous small irregular 

 yellow spots and stripes. Abdomen with lateral carinas on segments 2-4, broad, but 

 not inflated, as far as segment 6, and then suddenly contracted, segment 1 black, with 

 a small yellow spot on the middle of the sides, second segment black, with a large 



