1885. ] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 573 



ceous, and size decidedly smaller. Wing, 3.2O5 tail, 1.80; culmen, l.lOj 

 bill from nostril, .68; tarsus, .97; middle toe, .60. 



Five specimens, compared with a series of sixteen from the mainland 

 of Middle America (including sitecimens labeled ^1. citreojji/f/ia, A. scla- 

 t£ri, and A. cinnamomea), are all colored like those described above, show- 

 ing the difference from the mainland representative (or, more properly, 

 representatives, since there appear to be two and possibly three spe- 

 iiiea) to be not only very obvious but also exceedingly constant. 



Family TROOHILID^. 



'-f-^6. Tiochilus col ubris Linn. 



One specimen, obtained January 22. 



+ 47. Lampornis prevosti thalassinus Eidgw. 



Lampornia thalassinus, EiUGW. Descr. New Sp. B. Cozumel, February 26, 



1885, 3. 



SuBSP. OHAE. — Most like L. prevosti (Less.), but upper parts less 

 bronzy or more of a grass green, the black of the throat more extended, 

 and the breast more bluish green. 



Adult $ (type, Ko. 102,790, U. S. National Museum, Cozumel, January 

 24) : Above uniform metallic grass-green, with golden reflections in 

 ■certain lights; middle pair of rectrices metallic bottle-green or bronze- 

 green ; rest of tail brilliant metallic violet-purple on a rich chestnut 

 ground, the feathers bordered for terminal third, on both webs, with, 

 greenivsh black. Wing coverts metallic bronze-green, like the back 5 

 remiges uniform blackish dusky, with a faint gloss of brownish xmrple 

 in certain lights. Chin and throat uniform opaque velvety black, bor- 

 dered along each side by brilliai.t metallic Paris green, this changing 

 gradually on the jugulum to metallic sea-green, which gradually becomes 

 less bluish toward the abdomen; sides and flanks bronzy green, like 

 upper parts; exposed portion of lower tailcoverts dark chestnut, glossed 

 with i^uiple, and narrowly bordered terminally with dusky, the concealed 

 portions of the feathers dull dusky greenish; anterior lower tailcoverts 

 bright green. A line of white, downy feathers between flanks and 

 rump. Bill and feet black. Wing, 2.60; tail, 1.55; culmen (to extreme 

 base), 1.20, to frontal apices, 1.00. 



Immature S (No. 102,810, Cozumel, January 22) : Above bronzy grass- 

 green, much duller than in the adult, liectrices, except middle pair, 

 with basal two-thirds chestnut, richly glossed with metallic violet-purple, 

 the terminal third blue-black (glossed with bronze-green on edges), the 

 tip white. Lower parts chiefly white, divided medially bj' an irreg- 

 ular line or stripe extending from the middle of the throat to the anal 

 region, this opaque velvety black anteriorly, the rest sea-green and 

 dusky. Green of upper parts and white of lower surface separated, 

 from rictus to sides of breast, by a somewhat broken stripe of deep 

 <3innamou. Wing, 2.50; tail, 1.50; bill from frontal feathers, 1.00. 



