72 University of Michigan 



PLATE IV 



Diagrammatic patterns of head coloration ; figure 29 by Dr. Calvert. 



Figure 12, Hcfcragrioii flavovittatum, male, and figure 13, female, 

 collection ]\I. C. Z. ; figure 14, Hctcragrion ictcricum, type male, and 

 figure 15. allotype female; figure 16, Hcteragrion mclanunim, type 

 male; figure 17, Hcteragrion triangulare, male, figured by Calvert (4), 

 and figure 18, female, both sexes, collection Carn. Mus. ; figure 19, 

 Heteragrion ochraccum, female, collection M. C. Z. ; figure 20, Heter- 

 agrion beschkii, male, collection M. C. Z. ; figure 21, Heteragrion 

 aurantiacum, male, figured by Calvert (4), and figure 22, female, both 

 sexes collection Carn. Mus. ; figure 23, Hcteragrion sp., female, labelled 

 aurantiacum, but not that species, collection M. C. Z., see footnote 6; 

 figure 24, Heteragrion consors, male, collection M. C. Z. ; figure 25, 

 O.rystigina pctiolatum, male, Tumatumari, British Guiana, February 9, 

 1912, and figure 26, female, Wismar, British Guiana, January 31, 1912; 

 figure 27, Oxystigma cyanofrons, type male, and figure 28, allotype 

 female; figure 29, Heteragrion angustipenne, malt, fi§,uve.Ahy C2.\\trt{4) . 



