18 



X. tenuata, Smith. 



X. formosa, Smith. 



X. barbata, Fabricius. 



X. lateralis, Say. 



X. cyanea, Smith. 



X. tabaniformis, Smith. 



X. azteca, CressoD. 



X. subvirescens, Cresson. 



X. anthophoroides, Smith. 



Centris, Fabr. 



C. lanosa, Cresson. San José del Cabo; minas Calma- 

 lli; B. Cal., Hermosillo. 



C. eisenii, Fox. Gruaymas 1 . 



C. flavifrons (Fabricius), Lepeletier. Tepic. 



C. Jioffmanseggicie, Cockerell. Juárez. Mr. W. J. Fox 

 me dice que la ha visto en la Baja California. 



C. maculifrons, Smith. 



O. montezuma, Cresson. 



C. decolórala, Lepeletier. 



C. agilis, Smith. 



C. difformis, Smith. 



C. totonaca, Cresson. 



C. fulviventris, Cresson (dentípes, Smith). 



C. otomita, Cresson. 



C. aterrima, Smith. 



C. nigroccerulea, Smith. 



C. mexicana, Smith, 



C. melanchecena, Smith. Veracruz. 



C. ígnita, Smith. Orizaba. 



C. versicolor (Fabricius), Fabricius. 



