Occasional Papers of the Museum of Zoology 23 



female at Vienna. Calvert (4), in identifying specimens in the 

 Carnegie Museum from Chapada, Brazil, as triangularc, clear- 

 ly implied that he did not regard this material as conspecific 

 with the McLachlan specimens. I have studied the specimens 

 from Chapada, and I agree with Calvert. I have no idea 

 what the McLachlan specimens are, but they are certainly 

 nearer aurantiacuui than the species determined by Calvert 

 as triangulare. The species was credited to Hagen by de 

 Selys (i) but later (2) was credited to de Selys. The same 

 shift occurs in the case of macilentum. 



The profile of the head in both cases is similar to figure 65. 

 The arculus is distal to the cubito-anal cross-vein .3 to .4 mm., 

 and the anal vein separates from the posterior border .2 to .3 

 mm. distad to the cubito-anal cross-vein in the front wings and 

 .4 to .5 mm. in the hind wings. 



6. Hcteragrion macilcntiiin Selys 

 This species seems distinct by the male having a very dark 

 head (apparently darker than triangulare) and by lacking a 

 distinct broad black posthumeral stripe. It was described (de 

 Selys 1) from specimens from Porto Cabello, Venezuela, and 

 from Brazil in the Museum of Vienna and the de Selys and 

 Hagen collections. In 1886 (de Selys 2), under the name mis- 

 spelled macitentmn, the Venezuela record is repeated, but a 

 question mark, without explanation, follows Brazil. Only the 

 very teneral female has been described (de Selys i) and its 

 identity with the male was later questioned (de Selys 2). The 

 description of the female contains nothing definite. The same 

 shift in name of author occurs here as I have noted under 

 triangulare. The species is no longer represented in the 

 Hagen collection and I have not seen any specimens. In view 

 of its apparent relationships its occurrence in Venezuela, far 

 to the north of the range of its allies, is remarkable. 



