6 ARKIV FÖR ZOOLOGI BAND 12. N:0 8. 



wing 303; tarsus 103; middle toe and claw 123,5; hind toe 

 51,5; elan 38 mm. »Iris flame-coloured.» 



4. Herodias egretta Wils. — During an excursion along 

 Pacore River, one of the IJJO watercourses, which fall into 

 the Bay of Panama, Dr. Bovallius met vvith great flocks of 

 Egrets in a fen, a couple of kilometers in length. The bird 

 was observed at T i lire River, C. R. It also occurred at 

 San Juan, Nio., where it was observed in the neighbour- 

 hood of Rio Randal and Rio Mosquito. It was not as usu- 

 ally seen in flocks, but in single specimens, these being in 

 H cases of 17 in company with Florida ccerulea. Single 

 specimens were seen in Ometepe I. 



5. Egretta candidissima candidissima Gm. — Occurring 

 in great flocks in the Lake of Nicaragua, at the outflow 

 of this lake in San Carlos River. Instead of as usually 

 wading in the water in search of food, Dr. Bovallius here 

 observed the Snowy Egrets flying över deep water, in the 

 flight catching their prey at, or just under the surface of the 

 water. It was also common at Ometepe Island. 



6. Hydranassa tricolor ruficoUis Gosse. — 1 J", Nic, 

 San Juan del Norte, No v. 23. 



7. Florida cserulea L. — 1 J", Nic, Rio Ometepe, Muyo- 

 galpa, Jan. 1. 



8. Butorides virescens virescens L. — I $, Nic, San 

 Juan del Norte, Nov. 16. 



Said to be common at the mouths of most rivers in 

 Costa Rica and Nicaragua and also on the islands in the 

 Lake of Nicaragua. 



9. Nycticorax nycticorax naevius Bodd. — 1 J*, Nic, 

 Rio Ometepe, Chano Verde, Jan. 21. 



About this bird Dr. Bovallius says: »A low rustle was 

 heard in the densest leafage above us, and with long cau- 

 tious strides a white-breasted 'Correo', Night Heron, stalked 

 along the branches, suspiciously looking round, and at the 

 least noise concealing itself behind the trunk or a thicker 

 branch. But as a makeshift it took its recourse to the 

 wings — .» 



