346 Annals Entomological Society of America [Vol. IX, 



7. Posterior lobes of pronotum black 13 



Posterior lobes of pronotum pale or yellowish 8 



S. Antennal joints 9-12 not serrate beneath 9 



Antennal joints 9-12 serrate beneath 10 



9. Mesoscutum subopaque, with minute almost adjoining punctures . hruiineicornis 

 Mesoscutum shining, sparsely punctured fraternns 



10. Clypeus produced in the middle, with two large, obtuse teeth bidentatus 



Clypeus not produced in the middle 11 



11. Front subopaque, very densely punctate, appearing granulose occidentalis 



Front more or less shining, with separated or sparse punctures 12 



12. Front with distinct, separate punctures; frontal impressed line faint. 



neomexicamis 

 Front shining, with a few scattered punctures; frontal impressed line 

 very distinct florissanlensis 



13. Front sparsely punctured; lineolate running into tessalate; antennas 



simple, not serrate beneath leguminiferus 



Front densely punctured; antennee more or less serrate beneath 14 



14. Distance between the posterior ocelli a little greater than the distance 



between the lateral ocellus and the nearest eye margin, lateral margin 



of posterior face of propodeum not toothed crassicornis 



Distance between the posterior ocelli distinctly less than the distance 

 between the lateral ocellus and the nearest eye margin; lateral margin 

 of posterior face of propodeum toothed rugosus 



Xylocelia occidentalis Fox. 



1892. Diodontus occidentalis Fox, Trans. Amcr. Ent. Soc, xix, p. 315. 



Type locality: Southern California and Arizona. The 

 University collection contains one female and four males from 

 the following Nebraska localities: 



Sowbelly Canyon, Sioux County, June 23, 1911 (R. W. 

 Dawson), 1 9 ; Glen, Sioux County, July 12, 1910 (L. Bruner), 

 2cr; Monroe Canyon, Sioux County, August 16, 1912 (R. W. 

 Dawson), 1 c^ ; Monroe Canyon, Sioux County, August 20, 

 1908 (R. W. Dawson), Ic^. 



Xylocelia rugosus Fox. 



1S92. Diodontus rugosus Fox, Trans. Amer. Ent. Soc, xix, p. 315. 



Type locality: Montana, Illinois. Two specimens at hand from 

 Omaha; July 2, 1913 (L. T. Williams), cf and August 1, 1914 

 (L. T. Williams), cf. 



Xylocelia brunneicornis Viereck. 



1906. Diodontus brunneicornis Viereck, Trans. Amer. Ent. Soc. xxxii, p. 212. 



Type locality: Sedgwick County, Kansas. 

 Xylocelia florissantensis Rohwer. 



1909. Diodontus florissantensis Rohwer, Trans. Amer. Ent. Soc, xxv, p. 107. 



Type locality: Florissant, Colorado. 



