1886.] 



GEOCOCCYX CALTFORNIANUS. 



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 Citculus 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 hrevis agree with the 

 corresponding arrangement as found in my specimen of Geococcyx. 



So far as this one character is concerned, then, it points to the 

 fact that a certain affinity exists connecting our Geococcyx with the 

 Galbulidai. 



Fig. 1. 



Fig. 2. 



Fig. 1. Muscles at the outer side of the elbow of the right wing of Caprimulgus 



euro'pcBus. 



Fig. 2. The same of the left wing of Steatornis. (Both figures after Grarrod.) 

 tpb, tensor patagii bret is ; ecr, extensor carpi radialis (extensor meta- 

 carpi radialis longior of the present writer) ; b, biceps ; d, deltoid ; 

 t, triceps ; h, 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 europceus, 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 Geococcyx it goes to the extensor carpi 

 ulnaris muscle. 



Garrod pointed out another character of some value, which he 



