164 ENTOMOLCX^iCAL NEWS. [June, '19 



In Synopsis des Agrionines hat De Selys ein $ als ^. difficilis be- 

 schrieben, von Jirrimaguas in Peru. Calvert identifiziert damit eine 

 Argia vom oculata-Typus von Zentral-Amerika, Kolombia und Ekua- 

 dor. Ich halte diese aber fiir die typische oculata. Selys beschreibt 

 letztere von Venezuela. Ich besitze Ecuador-Exemplare, welche mit 

 Hagens Abbildung in den Appendices iibereinstimmen. Von Madre de 

 Dios in Peru liegt ein Mannchen vor, welches ich fiir typischer halte 

 als Calverts Exemplare. 



From his description of this male I quote only the following : 



Pterostigma rhomboid, Innenseite und Aussenseite ziemlich gleich, 

 die hintere kaum langer, Vorderseite etwa 6/5 der hintern. 



Prof. Foerster says nothing as to whether his Madre de Dios 

 male is conspecific with de Selys' female type of difficilis, and 

 until this is positively ascertained one cannot be sure that he 

 has correctly identified his specimen. In favor of his view, 

 indeed, is de Selys' statement : ''pterostigma brun, plus f once au 

 centre, rhomboidal aussi long que large, surmontant une cel- 

 lule," whereas in the specimens which I have regarded as diffi- 

 cilis the stigma is longer than wide, as the following measure- 

 ments show: 



"Difficilis" 9 , Cayuga. April 19, fore wing, stigma, anterior side .9, 

 posterior side .9, proximal side .78, distal side .78 mm. These measure- 

 ments were all made from the outside of the enclosing veins ; cor- 

 responding measurements of the same stigma made inside the en- 

 closing veins are .78, .78, .55, .61 mm. 



"Difficilis" 9, Quirigua, March: .86, .9, .77, .65 (.78, .69, .53, .53) mm. 



"Difficilis" S, Bucay, Ecuador: .86, .86, .57, .61 (.77, .69, .45, .49) mm. 



Oculata $, Cayuga, April. 25: .82, .82, .61, .61 (.69, .65, .49, .49) mm. 



Oculata 9, Cayuga, April 25: .94, .96, .77, .65 (.82, .82, .61, .57) mm. 



Dr. Ris (Archiv. f. Naturges., 1916, A, 9, p. 107, 1918) has 

 accepted my interpretation of difficilis and makes no reference 

 to the views of Prof. Foerster; it is of interest to note that he 

 quotes I S , 2 9 , Oberer Madre de Dios, Peru, as of A. ocu- 

 lata (t. c, pp. 105-6). 



Argia cuprea Hagen. Cayuga, January, 1918, $ 9 "in cop."; they 

 are of the "form a" of Dr. Ris (Archiv f. Naturges, 1916, A, 9, pp. 

 110-112, 1918). 



Argia extranea Hagen. Purulha, October, 1 9 . 



Acanthagrion gracile (Rambur). Quirigua, March 1, 1915, 1 $. 

 Like other Central American and Mexican examples, this will 



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