144 'IHE CANADIAN ENTOMOLOGIST 



spinules, with a concave area between the ridges, placed on the anterior third 

 of the segment and extending nearly to the truncate lobe of the seventh segment. 

 In Leptophlebia submarginata these last mentioned ridges are closer together 

 and shorter and completely covered by a mid-ventral triangular prolongation 

 of the apex of segment seven. 



In Leptophlebia prcepedita (?) (PI. X, Fig. 11) the posterior portion of the 

 seventh abdominal sternite is still more elongated, extending outward and 

 backward so as to be distinctly visible from the side. Segment eight is but 

 slightly modified. Leptophlebia betteni shows a further specialization in which 

 both segments seven and eight are conspicuously involved (Pl.X, Fig. 12). The 

 greatest development occurs in segment eight, the expanded portion of which 

 is extended ventrally into a long and narrow, distinctly ovipositor-like organ 

 the tip of which is quite heavily chitinized and basally into a short egg guide. 

 A backward prolongation of segment seven forms with segment eight a channel 

 for the passage of the eggs. An internal dissection showed that the oviducts, 

 extend to the egg-valve and open separately at its base. One species of 

 Hagemdns, which is found in Cuba has a much longer ovipositor-like extension 

 (PI. XI, Fig. 8) than has Leptophlebia betteni. A female specimen of this form, 

 which is in the Museum of Comparative Zoology at Cambridge, Mass., was 

 kindly loaned by Dr. Nathan Banks, and upon examination it was found that 

 segm.ent seven extends beyond the apex of the abdomen, folding together toward 

 the tip in a tubular form with an opening on the upper surface. Three chitinous 

 ridges extend along the under surface, converging to the tip. The oviducts 

 extend and open separately, the eggs passing into the ovipositor in two strings 

 whcse identity is lost as they pass out of the aperture in a cylinder. 



No nymphs of the genus Hagenulus have hitherto been made known; but a 

 specimen collected by Professor C. F. Baker in Cuba and sent to Dr. Needham, 

 in whcse slide collection it now appears, dissected and mounted, has enabled 

 the writer to present herewith Figures 1 to 7 of Plate XI. Noteworthy are the 

 inequilateral gills, the form of both labial and maxillary palpi, and most re- 

 markable of all, the extraordinary lateral extension of*- the labium, its breadth 

 greatly exceeding that of the head. 



Bibliography. 



(1) 1883. Eaton, Rev. Alfred Edwin. A Revisional Monograph of Recent 



Ephemerida or May-flies. — Part I by Rev. A. E. Eaton. In the 

 Transactions of the Linnean Society of London, 2nd Ser. Zoology, 

 Vol. Ill, Part 1 (1883) p. 1-281, pi. 1-63. 



(2) 1863. Hagen, Hermann August. Synopsis of the British Ephemerida. 



In the Entomologist's Annual for MDCCCLXIII, (1863) p. 1-35. 



(3) 1908. Needham, James G. New Data Concerning May-flies and Dragon 



Flies of New York. In Museum Bulletin 124, 33rd Report of the 

 State Entomologist on Injurious and Other Insects of the State of 

 New York, 1907 (1908), p. 188-198, pi. 10. 



