436 Mr. T. D. A. Cockerell — Descriptions and 



LXY. Descriptions and Records of Bees. — LXXVIII. 



I3y T. D. A. Cockerell, University of Colorado. 



Perdita perpulchra, Cockerell. 



Male. Aguas Calientes, Mexico, Dec. 1, 1909 {F. C- 

 Bishopp). New to Mexico. 



Agapostemon cocherelli, Crawford. 



Tlahualilo, Durango, Mexico, March 9, 1904, at peach- 

 blossoms, 6 ? {A. W. Morrill). New to Mexico. 



At the same flowers, at the same time, were takea females 

 of A. texanus, Cresson, and A. meUiventris, Cresson. 



Agaj)ostemon obscuratus, Cresson, var. ahjecfus, var. nov. 



$ . — 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 ohscuratusj though that has the 

 head and thorax black, with more or less purplo 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 scutellani 

 is dark but shining olive-green. 



Agapostemon 7iasutus, 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 tvpical A. nasutus is Santa Eulalia, 

 Peru, 3000 ft. alt., Jan. is, 1913 {C. A. T. Toivnsend). 



Ptiloglossa mayariim, Cockerell. 



Tabernilla, Canal Zone, Panama, May 14, 1907 {Auq. 

 Busck). 



Previously known only from Guatemala. 



Ptiloglossa eximia, Smith. 



Male. On convolvulus, C. Bolivar, Venezuela [M. A. 

 Carriker}. 



The marginal cell is longer in this species than in P. ma- 

 yarnm and P. me.vi'cana. 



