20 University of Michigan 



lo dull yellowish below. Appendages dull yellow at base, 

 brown at apex. 



Legs similar to those of male. 



Wings clear to tinged yellowish brown ; stigma light brown, 

 oblique, covering two to nearly three cells ; 6 front wings all 

 have two postquadrangular cells ; of 6 hind wings, 4 have two 

 postquadrangular cells, and 2 have two minus ; postnodals of 

 front wing 17 or 18, of hind wing 13 to' 15 ; the relations of the 

 cubito-anal cross-vein to the arculus and to the separation of 

 the anal vein from the posterior border are as in the male. 



Material Studied: Wismar, Tumatumari and Potaro Land- 

 ing, all in British Guiana, January 31 to February 10, 1912, 

 a total of fifteen males and three females, collection E. B. W. : 

 Tamanoir, ]\Iana River, French Guiana, May and June, 191 7, 

 S. M. Klages collector, collection Carnegie Museum, a total 

 of twenty-four males and thirteen females, both tenerals and 

 adults in each month. Type male, Wismar, January 31, 1912; 

 allotype female, Tumatumari, February 9, 1912. 



In the Proceedings of the National Museum, Vol. 48, pp. 

 626 and 627, I have described a small stream between Wismar 

 and Christianburg where we collected. Heteragrion ictericum 

 was taken along this stream associated with Bpipleoneura 

 lamina and fnscaenea. 



4. Heteragrion melanurum, new species 

 Figures 9, 16, 76, 77, 136 



Abdomen, male 32 to 34 mm.: hind wing, male 21 to 22. 



Male. — Rear of head and genae yellow ; labrum yellow to 

 dark brown, yellow along the anterior border, rhinarium and 

 nasus yellow, the latter sometimes darker to deep orange, dark- 

 er medianly and in front ; f rons orange or reddish brown ; 



