304 EEV. A. E. EATON ON EECENT EPHEMERID.E OR MAYFLIES. 



surface being of a dirty yellow colour. The dark markings comprise, on the thorax, — an 

 almost circular stripe on the neck ; two very large subquadrate spots and the commence- 

 ment of a longitudinal median line on the pronotum ; two longitudinal stripes on the 

 mesonotum united by a transverse band before the metanotum ; and two somewhat 

 confluent and more or less raised [knobbclaehtig] black spots upon the hind border of 

 the metanotum preceded by four similar black dots soaiewhat coalescing into a more or 

 less curved line: — the markings on the abdomen comprise, — two small oblong spots on 

 the dorsum of the first segment situated one on eacli side of the middle line and some- 

 wliat near the lateral border ; in the next segment the correspondiug marks are widened, 

 and in the fourth and fifth segments the spots begin to be blended into one; in the 

 following segments the corresponding spots become gradually larger, so that towards the 

 extremity of the body the ^vliole of tlie dorsum is occupied by the grey-black colour, 

 excej)tiug the lateral borders of the segments and the whole of the tei-minal segment, 

 which remain of a yellowislx colour. Venter uniformly pale yellow. On each side 

 of the mesothorax a fine oblique dark line extends backwards and downwards from the 

 transverse band of colouring mentioned above, and sometimes unites with a very similar 

 line running downwards in the opposite direction upon the side of the metathorax so as 

 to form a single arcuate line. Seta3 shorter than in C. lFcq)p(Ei. Length of body 

 12 mm. 



Hub. Buenos Ayres ; scarce. [After Weyenbergh ; abstract of translation.] 



Campsurus Nappii, Weyenbergh. 



PaUngcnia Nappii, Weycnb., Tijdscli. v. Eiit. xxvi. 1882-3, p. in2, pi. x. 2 (1883) [wings]. 



Adult. — Eyes brown-black. Underside of body yellowish. Pronotum greyish yellow, 

 with a darker longitudinal double median stripe, and with an extremely Jiarrow, dark, 

 nearly brown edging to its hind margin; the remainder of the notum grey-brown, with 

 three darker longitudinal stripes; the sides of the thorax lighter. Abdomen anteriorly 

 greyish above, with a darker transverse band in the hinder part of every segment ; 

 posteriorly these bands become successively broader, until in the seventh to the ninth 

 segments almost the whole surface of the dorsum is occupied by the darker colour ; the 

 tenth segment, however, remains yelloAV. Seta3 transparent white. Legs [pooteu en 

 sprieten] greyish, in some degree tinged with brownish. Wings transparent; fore wing 

 darker along tlie costal margin, owing to the colouring of the subcostaand radius, and 

 sometimes slightly lactescent in the remainder of the disk, as is usual in subimagines. 

 Length of body 13, wing about 12, sctse 6 about 33 millim. 



Uab. Santiago d. E., Argentine E-epublic; January. [After Weyenbergh; abstract 

 translation.] Judging from the figures of the wings, I am disposed to rank this species 

 in Campsurus, as well as the two preceding, pending further observations. The wings 

 illustrated by Prof. Weyenbergh in the cited publication appear to have been drawn in 

 situ, without being flattened out ; and this should be borne in mind when reference is 

 made to the plate. 



