3324 Quadrupeds. 



of a small Catagrarama ; but my kind host could not stay an hour at 

 the place, and I could have devoted a week profitably there. The 

 virgin forest is richer there in the summer, from being higher, thinner, 

 and drier, than here in the Lower Amazons. 



In your list of numbers I notice with delight that I have found some 

 new Papilios. P. Zagreus flew into a hut whilst we were encamped 

 on a sand-bank at Ega, and a boy brought it to me dead and broken. 

 I think I must have seen more of them, but thought it a Heliconia. Is 

 not P. Bolivar an exceedingly lovely thing ? If another new Papilio 

 turns up, I hope Mr. Hewitson will name it Orellana, after the first 

 heroic adventurer who explored the Amazons. 



I have no new dragon-flies for Mr. Dale, having worked them well 

 in 1848 and 1849. In my present collection are numbers of beautiful 

 Hymenoptera, now sent for the first time. In the Coleoptera the chief 

 things are a series of species of the genus Gorgus {Schonh.), allied to 

 Cryptorhynchus (Curculionidae). In life they are clothed with a short 

 silky pile, arranged in pretty patterns according to the species. I have 

 tried all methods of killing them, but cannot preserve the pile clean. 

 Probably with the pounded laurel-leaves it may be restored. There 

 are many different species sent, and all have the same habits, found 

 on trunks of standing trees in the woods, gnawing the bark; when ap- 

 proached they feign death, and fall to the ground, where half the spe- 

 cimens one sees are lost among fallen leaves. As to the Diurnes, you 

 may assure our old friends that I make great exertions to enable them 

 all to complete their series of beautiful small and rare Erycinidae and 

 Theclae, which are so very rare that a specimen only turns up now 

 and then, in months of assiduous research. H. W. Bates. 



Some Account of the Douroucouli Monkey, (Aotes trivirgatus, Humb.) 

 By H. W. Bates, Esq. 



I have had in my possession, since I left Ega in the month of 

 March last, a living specimen of a very curious nocturnal monkey, 

 which I suppose to be the Aotes trivirgatus of Humboldt, discovered 

 by him in the forests of the Cassiquare, near the head-waters of the 

 Rio Negro. My specimen was given to me in Ega, a country in ma- 

 ny respects different from the region of the Cassiquare, being the flat 

 level valley of the Upper Amazons, whilst the latter is a mountainous 

 country. It was taken by a friend of mine in the forest there, whilst 



