388 Annals Entomological Society of America [Vol. XI, 



Phlepsius (Dixianus) costomaculatus V. D. (Fig. 11a, b, c, d and e). 



This pale species is the largest one of the group. It occurs 

 in most of the Gulf States region of the United States and is the 

 only one so far known to occur far south of the Mexican border. 

 Specimens are at hand from Teapa in Tabasco, Mexico, Feb- 

 ruary, (H. H. S.). 



Phlepsius {Dixianus) utahnus Ball. 



Of this beautiful little species which occurs in the south- 

 western United States a single example has been examined 

 from Commondu, Lower California, Mexico (Haines). 



Subgenus Zioninus nov. 



Resembling Paraphlepsius in general form but without the foliaceous 

 margin to the vertex. Vertex long, flat, rounding or subangulate in 

 front; face almost straight in profile, meeting vertex at an acute angle; 

 the margin blunt and not inclined to be foliaceous ; front broad, wedge- 

 shaped, the ocelli distant more than their width from eyes. Pronotum 

 with the lateral margin almost as long as the short diameter of the eye, 

 strongly carinate. Elytra broad, short, apical cells almost quadrangular, 

 venation of disc much obscured by heavy reticulations. 



Type of the subgenus Phlepsius {Zioninus) extremus Ball. 



The broad, short form of this small species renders it quite 

 distinct in the broad-headed groups, while the large, flat vertex 

 and reticulate venation set it off structurally from all others. 



Phlepsius {Zioninus) extremus Ball (Fig. 13a, b, c, d and e). 



This species has been found in the United States from Utah 

 to California and south to Mexico. Mexican examples are at 

 hand from Ti Juana, June and August, (Ball). 



