ORDER HYMENOPTERA. 



171 



reasoning powers t" meet the exigencies of their life; tln-ir 

 nary acts being instinctive, viz., the results ol iuherited Imbii- 

 Typical are Camponotus, Polyergus, Formica, Myrn 



c\ -in-. :ni(l Tapinoma 



mily Odontomachidac Mandibles very long and suddenly 

 curved within al tip, inserted close to each other. Odontomachus. 

 Family Dorylidae. Am- with a very small or even IndisI 



I ■ .11 mexicana; worker >n:ij.>r; a, front view ..f head. 



clypeus; frontal crest very short; petiole depressed, nodiform 



ated by ;i single genus, Labidus, of which only the m 

 are known; and they are supposed to be the m Bciton 



Family Poneridne —Abdomen proper constricted between the iir-t 

 and second segments. Ponera 



Family Myrmicidte. In the stinging :ml< 1 1 1 » - petioli 

 two |oints. Myrmioa molesla Say is found all over the other 



typical genera are Attn. Eciton, Pseudomyrmn, P 

 iind Pheldole. The workers are divided into two sets; those with 

 large heads are called worker majors or soldiers, and th< smaller < 

 work r-minoi - 



roup of Fossores, or fossoria] Hymeno] 

 in u: of the Band- and wood-wasps, et<\. U I into 



number <d" families, some of which ma\ d. The 



potiolo is simple, i.>\. not formed int»» - nodes; there 



are no workers, though the females of the Mutillidsa are 



