Occasional Papers of the Museum of Zoology 17 



Petersburg. It was seen and described (in manuscript) by 

 de Selys about fifteen years before the Synopsis of 1862 was 

 published. Apparently it was never seen again by de Selys. 

 Evidently its resemblance to flavovittatum, as shown by de 

 Selys' notes on the St. Petersburg specimen, was his reason for 

 referring it to his group i. In the note following his descrip- 

 tion (de Selys i), where he compares it with dorsalc, fiavovit- 

 tatnin is certainly meant. 



From the above notes, it is evident that the species is poor- 

 ly known, its relationships uncertain, and its indicated habitat 

 indefinite. 



3. Heteragrion ictericum, new species 



Figures 8, 14, 15, 54, 65, 74, 75, 134, 135 



Abdomen, male 31 to 36 mm., average 34; female 28.5 to 30: 

 hind wing, male 22 to 23 ; female 24. 



Male. — Rear of head, genae, face and vertex, yellow, light- 

 er in front, passing gradually into darker posteriorly to be- 

 come orange on the vertex ; labrum more or less obscured, 

 angle of rhinarium and nasus usually darker, sometimes black ; 

 ocelli with their opposed sides narrowly bordered with black ; 

 on each side, between the lateral ocellus and the eye is a more 

 or less defined black bar, widened at either end and not reach- 

 ing the ocellus ; occipital crest black with more or less ol^scure 

 shadings at the ends ; all markings on vertex ill defined and 

 variable. Antenna brown, the first two segments paler to yel- 

 low. Profile as figured, figure 65. 



Front lobe of prothorax black in front, a median yellow 

 area ; middle lobe yellow, a dusky area on either side ; hind 

 lobe yellow, a dusky median area and a black spot on the 

 extreme lateral margin. Propleuron yellow. 



Thorax with a narrow middorsal black stripe, continuous 

 above with the antealar siiuis and covering the area included 



