S52 



AN INTRODUCTION TO ENTOMOLOGY 



An important feature of the head in the Hemiptera is the extended 

 development of the gular regions, which results in the beak being 



Fig. 402. — Tracheation of a fore wing of a pentatomid nymph. 



borne by the front part of the head. This contrasts strongly with the 

 condition found in the Homoptera, where the gula is so reduced that 



Fig. 403. — Head of Lemocertis, aorsal Fig. 404.^ — Head of Lethocerus, ventral 

 aspect. asoect. 



the beak arises from the hind part of the lower side of the head. 



In Lethocerus the occiput (Fig. 403, o) is separated from the vertex 



by a distinct transverse suture. The vertex (Fig. 403, v, v) is very 



