Calvert: Odonata of the Neotropical Region. 175 



The specific name proposed is derived from that of an Indian tribe 

 of the neighborhood. 



83. Acanthagrion interruptum Selys. 



Acanthagrion interruptum Ris, Hamburg. Magal. Sammelr. Odon., p. io, fig. 4. 

 1904. 



Habitat: — Chile, Banos de Cauquenes, 1 9. U. S. National 

 Museum. 



Talca, 2 c? 1 9, Lota 1 J*i ?, Penco, 48 cT 16 9, Concepcion, 

 8 d\ 8 9, all in January, 1905. Academy of Natural Sciences, 

 Philadelphia. 



All the above specimens were collected by Senor Carlos E. Reed. 



84. Acanthagrion cheliferum. 



(Plate V, Fip. 98.) 



Acanthagrion ? cheliferum Selys, Bull. Acad. Belg. (2) xli, p. 319. 1876. 

 Acanthagrion cheliferum Ris, Hamburg. Magal. Sammelr., Odon., p. 12, fig. 7 

 (apps. £). 1904. 



Six males and six females give the following data for the hind wings : 

 costal edge of stigma longer (100 per cent, c?, 83! per cent. 9 ) or 

 shorter (16J- percent. 9) than proximal or distal edges ; M 2 arising 

 nearest the fourth (75 per cent. cT, 100 per cent. 9), third (i6| per 

 cent. cT), or midway between the third and fourth (8i per cent, cT) 

 postnodal. 



As noted by Dr. Ris for his material from Bahia, so in the present 

 specimens from that locality, the nasus is pale blue, except for a black 

 line on the fronto-nasal suture. There is no perpendicular median black 

 line on the frons connecting the black of the upper part of the frons 

 with that of the nasus ; the blue postocular spots are larger as well as 

 the blue lateral spots on the middle lobe of the prothorax ; this lobe 

 has also a pair of median blue lines, the antehumeral blue stripe is 

 wider and abdominal segment 8 is entirely blue. Hagen had attached 

 the manuscript name of rusticum to these Bahia examples, and this 

 name may be employed subspecifically, if desired. The abdomen c? is 

 25 mm., hind wing $ 15. 5-17 mm. 



The remainder of the material has the usual characters of cheliferum 

 type, with abdominal segment 8 black or dark bronze-green dorsally 

 in both sexes, except in one male from Rio Grande do Sul, in which 

 the hindmost third of the dorsum of 8 is blue, confluent with that of 

 the sides, The females of form a of Ris have a pair of basal dorsal 



