390 GUNDLACH's work on the ODONATA of CUBA 



tergite of ten (.9-1.0 mm. on mid-dorsal line). Two spines on sternite of ten, 

 each .7-1.0 mm. long. 



Material examined: 5cf, 3 9, two of the males from Liberia and Surubres 

 in Costa Rica, the other specimens cited in Biologia Centrali-Americana.*^ 



ereagris (Plate XXXIV, figs. 31, 35-37.) 



d^. Ventral margins of tergite of two with a submarginal row of ten to 

 fourteen black denticles which extend from .32-.4 to .66-.7 of the segment's 

 length, i. e., in the anterior, converging portion of these margins. 



Spines of anterior lamina reaching caudad not as far as the level of the hind 

 edge of the hamular process, in profile view straight, forming an acute angle 

 with the ventral margin of two. 



Basal part of anterior hamule extending etc. for a distance subequal to or 

 shorter than that from that edge to the hind margin of the sternite of one. 



Planes of posterior part of hamular process subvertical and subtransverse ; 

 mesal angle of hind edge of process a little ventral to the place of union with the 

 anterior part. 



9 . Styles of genital valves 1.4-1.6 mm. long, distinctly longer than tergite 

 of ten (1.0 mm. on mid-dorsal line). Two spines on sternite of ten, each 1.0 

 mm. long. 



Material examined': 3cf, 3 9, the same as those listed antea, page 359. 



Explanation of Plates 

 Plate XXXIII 



Figs. 1-4. — Dorsal views of head of males oiEnallagtna spp., to show color 

 patterns, labrum omitted. X 11.8. Zeiss oc. 2, obj. A, lower lens off. 



Fig. 1. — E. truncatum Gundlach. Cuba, Poey, 1864. 



Fig. 2.—E. pollutum Hagen. Miami, Florida, March 27, 1901. 



Fig. 3. — E. vesper U7n new species. Hurdstown River, Lake Hopatcong, 

 New Jersey, September 6, 1902. 



Fig. 4.- — E. laurenti new species. Enterprise, Florida, April 15. Type. 



Figs. 5-7. — Dorsal views of left half of middle and hind prothoracic lobes of 

 Enallagma spp., to show color patterns. X 24. Zeiss oc. 4, obj. A, lower 

 lens off. 



Fig. 5. — E. pollutum Hagen. 9 , Biscayne Bay, Florida, pairing. 



Fig. 6. — E. pollutum Hagen. cf , Biscayne Bay, Florida. 



Fig. 7. — E. vesperum, new species. 9 , Pemigewassett Pond, New Hampshire, 

 July 9, 1917; pit, pit or fossa. 



Figs. 8-11. — Nasus and frons of Enallagma vesperum new species. 4d^, 

 Black Lake, New York, August 2, 1898, to show color patterns. Same scale 

 and lenses as in figs. 1 to 4. 



Figs. 12-23. — Left profile (even numbers) and dorsal (odd numbers) views 

 of terminal abdominal segment and appendages of males of Enallagum spp. 

 The broken lines indicate the boundary between the black of the dorsal sur- 

 face and the pale color of the side. X 28. Zeiss oc. 4, obj. A, lower lens off. 



Figs. 12, r,i.~E. truncatum Gundlach. Cuba, Poey, 1864. 



«9Neur., 193. 



