320 INSECTS. HEMIPTERA. 



* Head not narrowed posteriorly in the form of a neck, 

 f Head where broadest narrower than the thorax ; thorax narrowed before. 

 Gen. LYG.fcus. 



This genus is divided into, 1. Those with membranous appendages of the elytra 

 striated, or with areolas at their base and terminated afterwards by nerves. 2. Those 

 in which the membranous appendages have only some longitudinal often indistinct 

 nerves. 



I* Head at its greatest breadth as broad or broader than the thorax, and with the 

 posterior angles dilated ; eyes large ; thorax square. 



Gen. SALDA. 

 ** Head ovoid, narrowed posteriorly like a neck. 



Gen. MYODOCHA. 

 II. No ocelli; antennae often setaceous. 



Gen. ASTEMMA, CAPSUS, HETEROTOMA, Minis. 



Gen. SCUTELLKRA, Lat. Leach, Cimex, Lin. 

 Antennae with five joints, the second shorter than the third ; 

 scutellum large, covering the whole of the abdomen ; body 

 more or less oval ; thorax very narrow in front. 



S. sexmaculata, Leach. Red, shining with silver ; feet, antennae, 

 middle of the thorax, six spots on the scutellum, breast, and mar- 

 gin of the abdomen black. Inhabits New Caledonia. Zool. Mis.i. 

 pi. 36, fig. 1. 



Gen. LYG^US, Lat. Clmex, Lin. 



Antennae filiform, inserted beneath a line drawn from the eyes 

 to the base of the labrum ; body elongate-ovate ; head trigo- 

 nate ; neck not apparent ; tarsi with three distinct joints. 



L. apterus, Fab. Body red, mixed with black ; antennae, head, 

 scutellum, and feet black j a large black spot on the middle of the 



thorax divided by a red line. 4 lines long. Inhabits Europe 



Nouv. Diet, xviii. 302. 



TRIBE II. MEMBRANACE^E. 



Sheath of the sucker with only two or three apparent joints ; 

 labrum short and without striae ; all the feet inserted near the 

 medial line below the thorax, and terminated by distinct 

 hooks ; rostrum straight, sheathed at its base or in all its 

 length ; head not narrowed posteriorly ; eyes of medium size. 



I. Anterior feet terminated in a pincer ; antennae clubbed. 



Gen. M ACROCEPHALUS, PHYMATA. 



II. All the feet alike, and simply for walking. 



1. Antennas filiform, or thickest at their extremity. 



Gen. TINGIS, ARADUS. 



2. Antennas setaceous. 



Gen. CIMEX, (Acanthia lectularia, Fab.) 



Gen. CIMEX, Lin. Lat. Acanthia, Fab. 

 Rostrum short, of three joints ; tarsi with three joints, the first 

 very short ; body apterous, ovoid depressed, membranous ; 



