64 University of MicJiigan 



mclanurum. The males of the three species may be separated 

 at once by the color of the apical abdominal segments and the 

 form of the superior appendages. 



Heteragrion speciosiini Sjostedt. One male, Peru. 



As Dr. Sjostedt points out. aeqnatoriale and angustipennc 

 are the closest relatives of this species. In addition to the 

 darker abdomen it seems to differ from the others also in 

 having a larger ventral tooth on the male superior abdominal 

 appendage. It is certainly different in this latter character 

 from the species so determined and figured by Calvert, but it 

 is not certain that Calvert's aeqnatoriale is that species, and 

 speciosnm may really be a synonym of aeqnatoriale. The de- 

 scription and the figure of the abdominal pattern of speciosiiin 

 do not agree well. 



Heteragrion roniani Sjostedt. One male, Amazonas, 

 Manaos. 



Sinnilatnin is very near, possibly the same as this species, 

 but siuinlatnni shows only the usual widening of abdominal 

 segments 9 and 10 (the unusual widening may be an accident, 

 due to drying, in the type of roinani) and these segments are 

 colored as described and are not entirely black above as de- 

 scribed for rouiani which moreover seems to be a much duller 

 colored species than siumlatnm. However, Sjostedt's descrip- 

 tion is not detailed (the prothorax, brightly colored and sharp- 

 ly patterned in sinmlatnni, is entirely omitted) and positive 

 determination is impossible. 



On page 5 of Dr. Sjostedt's paper, eleventh line from 

 bottom, for Antenodalen read Postnodalen ; on page 9, tenth 

 line from the top insert Flit gel before Reicht, and, in the 

 third line above the table of measurements, for Posfcostalen 

 read Postnodalen. 



