Letter XIXTo Thomas Pennant, EsquireSelborne, Aug. 17, 1768.Dear Sir,I have now, past dispute, made out three distinct species of the willow-wrens (motacillae trochili) which constantly and invariably use distinct notes. But, at the same time, I am obliged to confess that I know nothing of your willow-lark.* In my letter of April the 18th, I told you peremptorily that I knew your willow-lark, but had not seen it then: but, when I came to procure it, it proved, in all respects, a very motacilla trochilus; only that it is a size larger than the two other, and the yellow-green of the whole upper part of the body is more vivid, and the belly of a clearer white. I have specimens of the three sorts now lying before me; and can discern that there are three gradations of sizes, and that the least has black legs, and the other two flesh-coloured ones. The yellowest bird is considerably the largest, and has its quill-feathers and secondary feathers tipped with white, which the others have not. This last haunts only the tops of trees in high beechen woods, and makes a sibilous grasshopper-like noise, now and then, at short intervals, shivering a little with its wings when it sings; and is, I make no doubt now, the regulus non cristatus of Ray, which he says ‘cantat voce stridula locustae.’ Yet this great ornithologist never suspected that there were three species.* Brit. Zool. edit. 1776, octavo, p. 381.
To Thomas Pennant, Esquire
Selborne, Aug. 17, 1768.
Dear Sir,
I have now, past dispute, made out three distinct species of the willow-wrens (motacillae trochili) which constantly and invariably use distinct notes. But, at the same time, I am obliged to confess that I know nothing of your willow-lark.* In my letter of April the 18th, I told you peremptorily that I knew your willow-lark, but had not seen it then: but, when I came to procure it, it proved, in all respects, a very motacilla trochilus; only that it is a size larger than the two other, and the yellow-green of the whole upper part of the body is more vivid, and the belly of a clearer white. I have specimens of the three sorts now lying before me; and can discern that there are three gradations of sizes, and that the least has black legs, and the other two flesh-coloured ones. The yellowest bird is considerably the largest, and has its quill-feathers and secondary feathers tipped with white, which the others have not. This last haunts only the tops of trees in high beechen woods, and makes a sibilous grasshopper-like noise, now and then, at short intervals, shivering a little with its wings when it sings; and is, I make no doubt now, the regulus non cristatus of Ray, which he says ‘cantat voce stridula locustae.’ Yet this great ornithologist never suspected that there were three species.
* Brit. Zool. edit. 1776, octavo, p. 381.