8COLIADJE. 



175 



is easily recognized by the black body and legs, and red pos- 

 terior femora, and is six lines long. C. Robinsonii Cresson 

 (Fig. 104, <?) is an elegant 

 species found in West 

 Virginia. An allied genus 

 is Mygnimia (Fig. 105, 

 wing) containing M. Mex- 

 icana Cresson and M. us- 

 tulataDahlb., two Mexican 

 species. 



In the genus Pepsis 

 (Fig. 106, wing) the max- 

 illary and labial palpi are 

 of equal length. The spe- 

 cies are large, some of 

 them being among the lar- 

 gest of Hymenoptera, and 

 are generally indigo-blue in color. Pepsis heros Dahlbom is 

 found in Cuba ; it is two inches long. P. cyanea Linn., 



which is blackish-blue, with 

 blue abdomen and wings, 

 the latter reddish at the 

 apex, has been described by 

 Beauvois from the United 

 States,' while P. elegans St. 

 Farg. also occurs in the 

 Southern States. 



P. formosa Say affords 

 another example of a species 

 rig. 106. common to both sides of the 



Rocky Mountains, as it has been found both in Texas and Cal- 

 ifornia. It is black, with bluish or greenish reflections, with 

 bright fiery red wings, and is thirteen to eighteen lines long. 



SCOLIAD^E Leach. This family forms a group very easily 

 distinguished from the Bembecidce or Chrysididce , as well 

 as the Pompilidce, by the broad front, the small indented eyes, 

 and the great sexual differences in the antennae, those of the 

 male being long and slowly thickened towards the tip, while in 



