On Bees from New Mexico. 7 



Parana formation is truly of late Tertiary age, and may 

 probably be correlated with the Pliocene of the northern 

 hemisphere. 



EXPLANATION OF PLATE I. 



Teeth of Elasinobranch fishes from the Parana formation, Province 

 of Eutrerios, Argentine Republic. 



Figs. 1, 1 a. Odontaspis eleyans, Ag. ; outer and lateral aspects. 



Fig. 2. Ditto; inner face. 



Fiys. 3, 3 a. Ditto ; inner and lateral aspects. 



Fii/s. 4, 5. Ditto ; inner face. 



Figs. 6, 6 a. Oxyrhina hastalis, Ag. ; outer and lateral aspects. 



Fiys. 7, 8. Ditto ; outer face. 



Fig. 9. Carcharodon meyalodon, Ag. ; outer face, two thirds nat. size. 



Figs. 10, 10 a. Galeocerdo aduncus, Ag. ; outer and inner faces. 



Fiys. 11, 11a. Hemipristis serra, Ag. ; outer and inner faces. 



The original specimens are in the National Museum, Buenos Aires, and 

 all the figures except no. 9 are of the natural size. 



II. — The J^eiv Mexico Bees of the Genus Megachile and a 

 new Andrena. By T. D. A. CoCKERELL, Professor of 

 Entomology, New Mexico Agricultural College. 



Megachile Wootoni, Ckll., 1898. 



The type was a male. I have before me two females from 

 the Rio Ruidoso, about 6900 feet, at flowers of Verbascum 

 thapsus, July 23 (C. H. T. Townsend). They differ at once 

 from the female of M. calogaster by having little or no black 

 hair on the vertex and mesothorax ; one has the orange 

 scopa as in calogaster, but the other has the scopa orange 

 in the middle and black at the sides, thus approaching 

 M. melanophcea. 



This belongs to the subgenus Megachile s. str., as restricted 

 by Friese. 



Megachile sapellonis, sp. n. 



$ . — Length 17-22 millim., the shorter examples having 

 the abdominal segments retracted. 



Black, with rather thin pubescence, white on sides of 

 face, cheeks, pleura, metathorax, femora, sides of first seg- 

 ment of abdomen, and hind margins of second and following 

 segments, more or less interrupted in the middle, at least on 



