436 Mr. T. D. A. Cockerell—Deseriptions and 
LIV.—Descriptions and Records of Bees —UXXVIII. 
By T. D. A. CockeRELL, University of Colorado. 
Perdita perpulchra, Cockerell. 
Male. Aguas Calientes, Mexico, Dec. 1, 1909 (Ff. C: 
Bishopp). New to Mexico. 
Agapostemon cockerelli, Crawford. 
Tlahualilo, Durango, Mexico, March 9, 1904, at peach- 
blossoms, 6 9 (A. W. Morrill). New to Mexico. 
At the same flowers, at the same time, were taken females 
of A. tevanus, Cresson, and A. melliventris, Cresson. 
Agapostemon obscuratus, Cresson, var. abjectus, var. Nov. 
9 .—Head and thorax obscure dark green; wings brownish. 
Cabanas, Cuba, May 28 (Palmer & Riley). 
Close to A. femoralis, but larger and with brownish wings, 
and the head and thorax quite differently coloured. I suppose 
that it is a form of Cresson’s obscuratus, though that has the 
head and thorax black, with more or less purple tinge, while 
in our insect these parts are very distinctly green. There is 
more black on the hind femora than in femoralis, but a large 
pale yellow patch on the outer side remains. ‘The scutellum 
is dark but shining olive-green. 
Agapostemon nasutus, Smith, variety a. 
@ .—Head deep purple-blue ; metathorax (except in middle) 
and parts of sides of thorax green. 
Frontera, Tabasco, Mexico. 
A new locality for typical A. nasutus is Santa Eulalia, 
Peru, 3000 ft. alt., Jan. 18, 1913 (C. A. 7. Townsend). 
Ptiloglossa mayarum, Cockerell. 
Tabernilla, Canal Zone, Panama, May 14, 1907 (Aug. 
Busck). 
Previously known only from Guatemala. 
Ptiloglossa eximia, Smith. 
Male. On convolvulus, C. Bolivar, Venezuela (AZ. A. 
Carriker). 
The marginal cell is longer in this species than in P. ma- 
yarum and P. mexteana. 
