36 University of Michigan 



dicate that the specimen in the de Selys collection has the 

 tooth on the superior appendages placed more basally than in 

 the case of the Peru male in the U. S. Museum. Otherwise, 

 as pointed out by Calvert (4), the Peru male agrees with de 

 Selys' description, though it is slightly larger, abdomen over 

 48 and the hind wing 29 mm. In both sexes the profile is like 

 figure 64. The arculus is .5 to .6 mm. distal to the cubito-anal 

 cross-vein, and the anal vein separates from the posterior 

 border at or as far as .2 mm. distad to the cubito-anal cross- 

 vein. 



23. Hctevagrion angiistipenne Selys 



Figures 29, 109, no, 158 



Described by de Selys (2) as a possible race of acqnatoriale. 

 The three last segments were lost from the single male. A 

 very much smaller specimen from Peru (abdomen 42, hind 

 wing 24.5, as compared with abdomen 48, hind wing 29, of de 

 Selys' specimen) has been identified as this species by Calvert 

 (4). The differences in size are probably not incompatible with 

 specific identity. De Selys briefly described the female as re- 

 sembling aequatoriale and icterops, but he did not describe 

 aequatorialc, except to give abdomen and wing measure- 

 ments, and the description of icterops is brief and contains 

 nothing distinctive. 



24. Heteragrion calendulum, new species 

 Figures 46, 94, 159 



Abdomen, male 36 mm. ; hind wing, male 23.5. 



Male. — Rear of head dull orange, darker above; face, frons 

 above and vertex in front bright orange ; not so reddish as in 

 mitratiini ; rear of vertex black, the line between black and 

 orange about the level of the lateral ocelli, with a bar for- 



