22 CALIFORNIA ACADEMY OF SCIENCES. 



not even hide the structural material. The two eggs which 

 were in the nest when found were not taken until March 31, 

 when they contained small embryos. Although these two 

 eggs constituted a set, I do not consider it a normal one, but 

 lacking in number from some cause unknown. The diame- 

 ter of each specimen is 19.5x15 mm. 



The female was sitting at the time I went to take the nest, 

 but quietly retreated amongst the rushes and made no dem- 

 onstration, further than a coarse "tchep" note. 



Two other nests, one containing two fresh eggs and the 

 other new, were shown to me by Mexican boys April 3; my 

 departure from Comondu on that day prevented me from 

 securing more than these two additional eggs, which meas- 

 ure 19.5x14.5 and 19.5 x 15 millimetres. 



A young bird, the plumage of which has, I believe, never 

 been described, was taken at Comondu, April 18, 1888. It 

 was attended by the female, which exhibited considerable 

 solicitude for its safety. 



Young (No. 3211, immature, coll. of W. E. B. from 

 Comondu, Lower California). — Above, uniform dark olive- 

 brown. Below, sides, and under wing coverts, light yellow- 

 ish-buff. Faint indications of light superciliary stripe. 

 Wings above, dark olive-green with distinct greenish edging 

 to outer web of each feather except the first, which has a 

 whitish edging the same as adults. Greater wing coverts, 

 rusty on edges. Tail, olive-green above, lighter below. A 

 few feathers of the fall plumage are just showing on the 

 sides of the breast; otherwise the specimen seems to be in 

 first plumage. 



Melospiza fasciata rivularis Bryaut. 



Brown's Song Sparrow. — Nest building begins about the 

 middle of March with this bird at Comondu. In 1888 I 

 found them sitting, March 12. This year I prepared a female 

 taken at Comondu, March 22, at 7 a. M. , which contained a 



