170 PROCEEDINGS OF TJIE ACADEMY OF 



Genus I. jEstrelata Bp., 1855. Bill robust, compressed, its unguis large, 

 booked fiom the nostrils. Interramal space narrow, fully feathered. Extension 

 of featbers oa forehead moderate. Nasal case short. Tail more or less cunei- 

 form, the lateral rectrices much graduated. Hallux of ordinary size. 



1. A. H.ESiTATA Coues, ex Proc. hxsitata Kuhl. Not of Forst., Reich., Gld. 

 nor Fuff. hresit. Lawr. Proc. brevirostris and meridionalis Lawr., or Fulmarus 

 merid. Bp., but not brevirostris Less. Pitffinus V Herrainieri Less. jEstrelata 

 diabolica Bp. Large; pileum and upper parts brown; upper tail coverts, basal 

 half of tail, forehead and neck all around white. Bill or tarsus 1-45 ; wing 

 12-00; tail 5-50 ; middle toe and claw 2-12. 



2. A. Lessoni Cassin, ex Proc. Lessoni Garnot. Rhaniistes Lessoni Bp. Proc. 

 leucocephala Forst. jlEsirelata leuco. Bp. ?Pr. alba Gm. ?Daption album Steph. 

 Pr. variegata Bonn. Pr. vagabunda Sol. secundum Bp. Large ; head all around 

 white, except a transocular fascia. Back deep ash. Tail and coverts ashy 

 gray. Bill 1'50 ; tarsus 1*65 ; middle toe and claw 2-50. 



3. A. ROSTRATA Gray, ex Pr. rostrata Peale. Rhaniistes rost. Bp. Large, bill 

 exceedingly robust, alongr chord of culmen 1-37; height or width at base 066. 

 Wing 11-00, tail 4-75. Tarsus 1-75. With the pattern of coloration and nearly 

 the tints of young Lessoni. Frontal feathers running far forward on the nasal 

 case. 



4. A. PARViROSTRis Coues, ex Pr. parvirostris Peale- Rhantistes parvir. Bp. 

 Medium, bill slender and compressed, its length 1-08. Tarsus 1-25. Outer toe 

 and claw 166. Young? Above deep fuliginous brown, (no trace of ashy.) 

 this color extending all around the head and neck, on the tips of the feathers. 



5. A. INCERTA Coues, ex Pr. incerta Schlegel. — Large. Wing 11-50 ; tail nearly 

 5, much graduated. Bill 16 to 17 lines ; height 5 lines. Tarsus 1-50. Colors 

 as described much those of young Lessoni ; to which the species may be re- 

 ferrible. 



6. A. NEGLECTA Coucs, cx Pr. neglecla Schlegel. — Medium, with the colors of 

 incerta. Bill ; length 1-12 ; height 4 to 5 lines. Wing 10-00 inches. Per- 

 haps to be referred to parvirostris. 



7. A. SoLANDRi Coues, ex Proc. solandri Gould. — Cookilaria solandri Bp. — Pr. 

 melanopus Natt. nee. Gm. — Large ; very robust. Length 16 ; bill 1-75 ; wing 

 12; tarsus 75 ; tail 5-50; middle toe and claw 2-37. Bill and feet black. 

 Above dark brown ; becoming slate gray on middle of back, and wing and tail 

 coverts. Young? Washed with gray on the abdomen. 



8. A. GRiSEA Coues, ex Pr. grisea Kuhl, according to Schlegel's identi- 

 fication. — Pr. lugens Banks, Forst. ined. ^st. inexpectata Bp. nee. Forst. 

 Medium, generally like mollis ; with a more compressed bill, and some discrep- 

 ancies in dimensions. Wing 9-50 ; tail 3-88 ; bill lU lines ; tarsus IG\ lines ; 

 middle toe 19 lines. 



9. A. MOLLIS Coues, ex Pr. mollis Gould. — CooMlaria and Rhaniistes mollis 

 Bp. — Pr. inezpcclala Forst. — ? J'r. melanopus Gm. Vieill. Steph. — ? Pr. gularis 

 Peale. — ? J'r. Philippii Graj. — ? Pr. crepidala vel sandaliaia Sol. according to 

 Bp. Medium, bill (chord of culmen) 1-10 ; height at base -45 ; width slightly 

 less ; tarsus 1 33 ; outer toe and claw 1 -75 ; wing ranging from 950 to 10-50 ; 

 tail 4-50. Under surfaces of the wings concolor with the upper. 



10. A. CooKii Coues, ex Pr. Cookii Gray. — Rhaniistes Cookii Bp. — Pr. leucop- 

 tera Gld. Cookilaria leucopiera and C. vcloz, Rhaniistes velox Bp. Pr. brcvipes 

 Peale. Small. Bill 1-00, height at base -35. Wing 8-50 to 9-00 ; tail 3-75 to 

 4-25, its lateral graduation 1-00 to 1-50. Tarsus 110. Under wing coverts 

 and a line along edge of fore arm white. 



[May, 



