1886. | GEOCOCCYX CALIFORNIANUS. 471 
It is still further interesting to compare the arrangement of these 
tendons in Geococcyx with the similar structures as they were found 
to exist by Mr. Garrod in Upupa epops and Cuculus canorus, both 
of which are figured upon the same plate alluded to above. We at 
once observe that our subject differs considerably in these particulars 
not only from the Hoopoe, but still more from the Cuckoo. Indeed, 
so far as Upupa is concerned, it simply lacks the long slip going to 
the humeral condyle in order to make the arrangement of the 
insertional extremities of the tensor patagii brevis agree with the 
corresponding arrangement as found in my specimen of Geococcyw. 
So far as this one character is concerned, then, it points to the 
fact that a certain affinity exists connecting our Geococcyx with the 
Galbulide. ji 
Fig. 1. Fig. 2. 
Fig. 1. Muscles at the outer side of the elbow of the right wing of Caprimulgus 
europeus. 
Fig. 2. The same of the left wing of Steatornis. (Both figures after Garrod.) 
tpb, tensor patagii brevis; ecr, extensor carpi radialis (extensor meta- 
carpi radialis longior of the present writer); 0, biceps; d, deltoid ; 
¢, triceps ; 2, humerus. 
Further, the marked difference in this particular between Geo- 
coccyx and Cuculus canorus is not to be overlooked. 
Now, strange to say, there is still another (and what we must 
believe to be a widely separated) group of birds that possesses an 
arrangement of the insertional extremity of the tensor patagii brevis 
very much as we find it in our present subject. ‘These are no 
others than the Caprimulgi. 
I reproduce (figs. 1 & 2) Prof. Garrod’s figures of these parts in 
Steatornis and Caprimulgus europeus, the better to show this simi- 
larity. It will be seen in these Caprimulgine birds, however, that 
the lowest slip merges with the fascia to the outer side of the ulna, 
while in my specimen of Geococeyw it goes to the extensor carpi 
ulnaris muscle. 
Garrod pointed out another character of some value, which he 
