ARTHROPODA. 149 



Bassus. Ophion. Evaniida. 



Tryphon. Agriotypus. Stephanus. 



Banchus. Pezomachus. Evania. 



Exetastes. Hemiteles. Pelecinus. 



Porizon. Cryptus. Fcenus. 



Campoplex. Amblytelus. Megalyra. 



Paniscus. Ichneumon. Trigonalys. 



TUBULIPERA. Posterior segments of the abdomen retractile, 

 and provided with a membranous ovipositor, composed of a 

 single piece. Solitary, deposit their eggs in the nests of other 

 Hymenoptera. 



Eichly coloured insects, only appearing in the hottest sunshine, 

 and capable of rolling themselves up into a ball. They are re- 

 markable for having the underside of the abdomen concave. 



Chrysididce. Elampus. 



Chrysis. Hedychrum. 



Euchroeus. Parnopes. 



Stilbum. Cleptes. 

 Homalus. 



HETEROGYNA. Males, females, and neuters ; the latter abortive 

 wingless females, sometimes of two kinds workers and soldiers. 

 Social, build nests, and excavate tunnels. 



The soldiers (or "policemen") have very large heads. The 

 females and workers of many species are furnished with a sting. 

 Some species carry off the larvas of other species, which are edu- 

 cated as slaves and then take charge of their captor's colony. 

 The common Formica sanguined is one of the slave-making ants. 



The Dorylidas are differentiated from the Formicidae by the 

 first segment of the abdomen only forming the peduncle. Their 

 sexes are not certainly known. 



Formicidce (Ants). Myrmecia. (Ecodoma. 



Formica. Myrmecina. Cryptocerus. 



Tapinoma. Stenomma. 



Ponera. Crematogaster. Doryliaa. 



Polyergus. Eciton. Anomma. 



Odontomachus. Solenopsis. Myrmecocystus. 



Polyrhachis. Strongylognathus. Labidus. 



Ectatornma. Daceton. Dorylus $ } 



(EcophyUa. Phidole. Dichthadia ? I ? 



Myrmica. Monomorium. Typhlopone, $ J 



