1918.] NATURAL SCIENCES OF PHILADELPHIA. 271 



321. Stelgidopteryx ruficollis uropygialis (Lawrence). Panama Rough-winged Swallow. 



A male and two females, Gatun, July 9, 1911, and June 3, 1912, 

 November 5, 1911. Iris brown, bill and feet dull black. 

 The last specimen has two pure white quills in the wing. 



POLIOPTILID^. 



322. Polioptila superciliaris superciliaris Lawrence. Lawrence's Gnatcatcher. 



Male, Gatun, Januarj- 1, 1912. Iris brown, bill black, mandible 

 blue-gray at base, feet black. 

 Found in second growth. 



TROGLODYTID^. 

 [323.1 Heleodytes albobrunneus Lawrence. White-headed Cactus Wren. 

 324. Thryophilus modestus elutus Bangs. Panama Wren. 



Two males, Gatun, April 30 and December 24, 1911. Iris golden 

 brown, bill black, mandible bluish-gray with black tip. feet blue-gray. 

 In thickets near the jungle. 



[325.] Thryophilus rufalbus castanonotus Ridgway. Chestnut-backed Wren. 



326. Thryophilus galbraithii galbraithii (Lawrence). Galbraith's Wren. 



A pair, Gatun, June 23, 1912, and a male, Gatun, April 14, 1912. 

 Iris reddish-brown, bill dusky paler below, feet blue-gray. 

 In thickets. 



327. Thryophilus castaneus castaneus (Lawrence). Bay Wren. 



Male, female and nestling, Gatun, February 18, March 15, 1911, 

 and July 28, 1912. Iris reddish-brown, bill black lighter below, 

 feet black. 



Found in heavy undergrowth in damp jungle-thickets. Song 

 loud and ringing, resembling that of Thryothorus ludovicianus, but 

 much longer. 



Nest a loosely built elbow-shaped affair, made almost entirely of a 

 round-stemmed grass and lined with finer stems of the same, a few 

 coarser stems and reddish-brown vine tendrils on the outside. Loosely 

 placed in vines, four feet up, by a stream; contained one fresh egg, 

 July 28, measuring .90 x .59 in. 



328. Troglodytes musculus inquietus (Baird). Panama House Wren. 



Male and female, Gatun, February 26, 1911; male, Gatun, Sep- 

 tember 17, 1911, and female and young, Ft. Lorenzo, June 11, 1911. 

 Iris gray-brown, bill and feet brown. 



In thickets along the lake shore, cocoanut groves, etc. 



A nest was built in a floating boathouse, on a beam under the roof, 

 made of weed stalks, small twigs and a few feathers inside. Also 

 contained a small cast snake skin and part of a kodak film. The 



