OhcrlioUei — StatKs of Generic Name Hemiprocne Nitzsch. 69 



sufficient for its recognition as a different genus. However valid 

 such a claim may be, — and it seems not to be so in this case, — 

 there can be now no doubt of tlie propriety of generically segregat- 

 ing the group of swifts of which Hirundo zonaris Shaw may be con- 

 sidered the representative, because aside from its emarginate 

 instead of square or rounded tail, it differs remarkably from 

 Chaetura in the arrangement of the deep plantar tendons. Mr. 

 F. A. Lucas has recently shown* that in Hemiprocne zonaris, the 

 muscle which ordinarily flexes the front toes, the flexor perforans, 

 instead of having its own tendon as is usual in the swifts, is at- 

 tached to the muscle of the hallux, ilia flexor longus hallvcis, and 

 their common single tendon l)y means of four slips ultimately 

 reaches and manipulates all the digits. 



In view of all the aVjove facts it seems proper to provide this 

 group with a generic name, and Streptoprocne, from sTpe-n-rSs, 

 torquis, and UpoKvrj, Progvc, with Hiniudo zonaris Shaw as the 

 type, is suggested as appropriate. The species will therefore 

 stand as follows : 



Streptoprocne zonaris zonaris (Shaw). 



Streptoprocne zonaris alhicincta (Cabanis). 



Streptoprocne zonaris palUdifrons (Hartert). 



Streptoprocne biscutata (Sclater). 



^reptop)'ocne semicollaris (Saussure). 



* Auk, 1899, pp. 77-78. 



