108 Annals of the Carnegie Museum. 



there is but one entire cell and a small part of another between the 

 quadrilateral and the level of the vein descending from the nodus on 

 the left hind wing ; the stigma surmounts the equivalent of two cells 

 on the left wings, the front wings have 18 postnodals, the maximum 

 width of the hind wings is 4 mm. De Selys' description of the thorax 

 would appear to be slightly incorrect, as "seconde suture laterale" 

 is the same as the "suture laterale mediane " and ought probably to 

 have been "premiere suture laterale " ; so altered, the present male 

 agrees with the description ; the tooth of the superior appendages is 

 not as acute as in H. majus. 



?. The specimen is teneral, pterostigma pale yellow, surmounting 

 the equivalent of two cells or more, maximum width of hind wings 

 5 mm. ; abdominal segments 4-6 are lost, genital valves 1 mm. long, 

 exclusive of the "palps" : hind wing 30.5 mm. 



36. Heteragrion angustipenne Selys. 

 (Plate III, figs. 42, 43.) 

 Heteragrion angustipenne Selys, Mem. Couron. Acad. Belg., xxxviii, p. 64, 1886. 



Habitat. — Peru : Cumbase, 1 d\ Collection of P. P. Calvert 

 ex coll. R. Martin. 



Smaller than the type, abdomen 42, hind wing 24. 5 mm., maximum 

 width of front or hind wing 3.2 mm. ; 16 postnodals on the front 

 wing ; otherwise agreeing well with the description, which does not 

 include the last three segments or the appendages, wherefore the fol- 

 lowing : 8 pale yellow, some brown on each side at base ; 9 and 10 

 blackish-brown on dorsum, sides inferiorly and ventral surface pale 

 (yellowish?). Superior appendages twice as long as 10, as long as 

 9, blackish, almost identical in shape with those of H. inca, n. sp. (a. 

 v. ) . Inferior appendages very small, pale throughout, their slender 

 apices directed upward. 



37. Heteragrion inca sp. no v. 



(Plate III, fig. 38.) 



d\ Dorsal surface of the head black from the median ocellus back to 

 the posterior margin, frons and nasus golden yellow ; first two anten- 

 nal joints, genae, lips, and rear of head pale yellow, but not golden ; 

 an elongate black spot between each antenna-base and the adjoining 

 eye. 



