108 [October, 



is articulated to the margin of the penultimate segment, and is capable 

 of being extended downwards almost at right angles to the abdomen, 

 but in repose it is horizontal. 



S. fuliginosa was first described by Pictet in the " Annales des 

 Sciences Naturelles" for 1836 ; afterwards by Burmeister in the " Hand- 

 buch der Entomologie," 2, p. 947 ; and subsequently by Brauer in 

 "Neuroptera Austriaca," p. 52. Eambur ("Hist. Nat. Nevrop.," p. 448) 

 doubts the distinctness of the species from S. lutaria ; he had probably 

 never seen an example of the true fuliginosa. It is, perhaps, widely 

 distributed on the Continent, but overlooked. I possess several 

 examples from Prof. Zeller, including a type from Brauer. At Eannoch 

 it frequented the moor-streams, but did not seem common ; S. lutaria 

 was not seen there, but was found at Pitlochry, thirty miles to the east 

 of Camachgouran. 



Fig. 1 represents an anterior wing of S. fuliginosa, and the ventral 

 lobe of the male ; fig. 2 the corresponding wing and lobe of S. lutaria. 



Forest Hill, London, I2th September, 1865. 



Mimetic analogy. — In reading Bates' " Naturalist on the Eiver Amazons," I 

 was much struck by the curious fact that a similarity of colouring exists between 

 some of the Eeliconidoe and butterflies of other families. It reminded me of what 

 I had myself observed with regard to the allied family Danaidce. In North 

 America Danais Archippus, Fab., is exactly imitated by Nymphalis Disippus, Godt., 

 and in Southern Africa the resemblance between Danais Echeria and Papilio Cenea, 

 and that between Danais Chrysippus and the female of Diadema Bolina, is most 

 striking. In the last case, even the larvse of the two insects resemble each other, 

 and, moreover, feed on the same plant, the Oleander, according to Boisduval. In 

 British KaflEraria, however, I found that the larva of Danais Chrysippus fed on an 

 Asclepiadaceous plant, Oomphocarpus fruticosus. I had no opportunity of observing 

 the metamorphoses of Diadema Bolina, as it is scarce in KafFraria ; whereas Danais 

 Chrysippus, notwithstanding that its beautiful larva is extremely subject to the 

 attacks of Ichneumons, is one of the most abundant butterflies in the country. As 

 is well known, the difference of colouring and marking between the <? and $ of 

 Bolina is so great that they have been described as distinct species by Linnaeus, 

 Fabricius, Godart, &c., and there is not the least resemblance between the male 

 Bolina and D. Chrysippus. 



Numerous species of Acrcea represent in South Africa the Heliconice of the 

 New World, and like them they are sluggish insects, emitting a peculiar scent, 

 which seems to render them distasteful to birds, &o. ; but I do not know of any 

 African butterfly which at all approaches them in appeiu'ance. — William Stewart 

 M. D' Urban, Newport House, near Exeter, Septe^nhcr, 1865. 



