NEUKOPTERA— ODONATA— AGRIONINA. 131' 



thickened black veins, and surmounts four cellules at its lower margin ; the 

 veins of the wing generally are testaceous; there are twenty postcubitals. 



Length of the wing, 36""°; length of part beyond peduncle, 34"""; 

 breadth, 'J'""'; distance from nodus to tip of wing, 23"""; from arculus to 

 nodus, 8"""; from nodus to inner angle of pterostigma, 17"'"'; length of 

 pterostigma, 3.5""". 



Another wing from the same beds with its reverse (Nos. 4165, 4166) 

 is very fragmentary, showing little besides the border of the apical half of 

 the wing with the pterostigma, and most of the postcubital nervules. I have 

 here considered it the hind wing of the same species, from its similar size, 

 the exact resemblance of the pterostigma, which also surmounts four cel- 

 lules, and the indication of a similar profusion of intercalated supplementary 

 nervules. It seems, however, not improbable that it may prove to be a 

 second species of the same genus, from the great difference in form. The 

 two borders of the outer half of the wing are nearly parallel, and the apex 

 falls a little below the middle. This diff'erence, however, really concerns 

 only the posterior curve of the wing below the apex. The nodus is not 

 preserved. Greatest breadth, 7.5™"'. 



Considering the fragments of heads, etc., referred to under the genus 

 as belonging to this species, we have to add Nos. 4179, 4180, and 4182 

 (besides No. 62 of Mr. Richardson's collection) as representing heads; Nos. 

 418J, 4184, the united head, thorax, and ba.se of wings; and Nos. 4170, 

 4173, 4174, 4177, 4178, as parts of the abdomen. The abdomen shows a 

 slender, dorsal, pale stripe, distinct and moderately broad on the sixth to 

 the eighth segments, scarcely reaching either border, and posteriorly ex- 

 panding into a small, round spot ; and a faint dorsal line on the fourth and 

 fifth segments, interrupted just before the tip. The appendages are simple. 



Length of head (according to the mode of preservation), 4.0-4.5°""; 

 breadth of same, 5.5°"°; length of thorax, 5™™; of pedicel of wing, 5*°"; of 

 abdomen (probably 1°"" should be added for a break at the base), 39"™; 

 length of segments 8 to 10, 6"""; breadth of ninth segment, 2.75""; of 

 fifth segment, 2.1""; estimated length of whole body, 55"". 



Named for my friend and fellow collector of Green River fossils, Mr. 

 P>ederick C. Bowditch, of Boston. 



Green River, Wyoming. Three specimens, Nos. 4165 and 4166, 4167 

 and 4168, 15244, besides the parts of the body mentioned. 



