172 



IlYxMENOPTERA. 



above, than in the other genera ; the front of the head is about 



a third longer than broad. The antennje are long and fili- 

 form and sometimes crenulate, as in Figure 91 a, in the 

 males ; the mandibles are stout, Ijroad, sabre-sliaped, 

 being much curved, with low flattened teeth, and the 

 maxillary palpi are longer than the laljial palpi. The 

 wings are rather broad, with the three subcostal cells 

 l3'ing in a straight. row. The abdomen is slightlj^ com- 

 pressed, and equals in length the remainder of the 

 body. The sting is very large and formidable, and ex- 

 cessively painful, benumbing the parts it enters. They 

 are exceedingly active, running and fl^'ing over sandy 



places like winged spiders. 



There are about five hundred species of this genus described. 



They are usually shining black or deep bluish black, with 



Fis. 91 a. 



Fig. 92. 



smoky or reddish wings, and sometimes a reddish abdominal 

 band. This genus is interesting, as affording in its form a 

 mean between the globular thorax and short bod}^ of the 

 Apiarifje and the elongated body of the Ichneumonidm. 



The Pompilus formosxis Say (Fig. 92), called in Texas the 

 Tarantula-killer, attacks that immense spider the Mygale Hentzii, 

 and, according to Dr. G. Lincecum (American Naturalist, May, 



