(whicli turns out to be new and is described below) was 

 observed. It was at rest on the upperside of a leaf with wings 

 flat and partly drawn back. It was beaten into the net, and 

 was sluggish as the weather was dull. No other specimen was 

 seen, and neither P. angidosa nor the present species was seen 

 on the wing. 



" The whole set of insects taken during the week is especially 

 interesting from its rather unusual composition, Helicotiius 

 aulicus being present in some numbers, and having no very 

 real support from any very similar Ithomiine. Hirsutisficria 

 certainly never gave a suggestion that it might be a Heliconius 

 aulicus. Probably at different periods of the year the com- 

 position of the group varies greatly, as I found it did over a 

 long series of collections made in central British Guiana. But 

 the Ithomiine models of the Heliconines were there never 

 absent. In the case of Heliconius anderida estebana, which 

 was practically absent at San Esteban, it was interesting that 

 Lycorea ceres atergatis was also practically absent contem- 

 poraneously, as these two are probably in close association 

 with the Protogonius. The most perfectly protected mimic 

 was undoubtedly the Pierine, Dismorphia a. astynomides, 

 as its associated Ithomiine models outnumbered it by at least 

 ten and perhaps twenty times, while the detailed resemblance 

 to two of the models, Ceratinia fraterna and Mechanitis p. 

 doryssus, made detection on the wing onl}^ possible with close 

 scrutiny. 



" It remains to be said that lizards were observed in the 

 greatest abundance, especially on the bank before mentioned, 

 where the Ithomiines were mixed up with Dismorphia a. 

 astynomides y 



Pericopis philithomia, n. sp. 



Intermediate between Pericopis isse and Pericopis itiiomia. 



Pore-wing very dark greyish brown with a slightly paler 

 longitudinal shade below the median nervure. A pale yellow 

 transverse median band from costa to tornus, and a parallel 

 broad pale yellow subapical band. A marginal series of whitish 

 spots from apex to tornus. Hind-wing pale reddish orange, 

 with the discocellulars heavily marked. A broad marginal 

 band composed of oblong black spots or wedge-shaped marks. 

 Just before the margin the ground-colour of the wing shows 



