386 FAMILY XI. — LYGJEWJE. 



aa. Head never extended behind into a long curved neck. 



b. Pronotum usually constricted at or slightly behind the middle, 

 the front lobe black and (except in some Ptochiomera) never 

 more than twice as long as hind one (fig. 69). 

 c. Head not inserted in thorax to eyes; front lobe of pronotum with 

 a constricted ring-like collar; body more or less elongate. 

 d. Head strongly exserted forming a short neck at base, the post- 

 ocular space about four times as long as that between base of 

 antenna? and eye (fig. 84) ; eyes placed at or near middle of 

 head. II. Her^us, p. 389. 



dd. Head much less exserted, usually strongly contracted just be- 

 hind eyes, the postocular space subequal to that between base 

 of antennas and eye."'" 

 e. Front lobe of pronotum globose, almost the diameter and about 

 twice the length of hind one; head and front lobe of pronotum 

 shining; scutellum much longer than wide. 



III. Sph^erobius, p. 391. 

 ee. Front lobe of pronotum less globose, narrower than the hind 

 one; head and pronotum seldom shining. 

 /. The two lobes of pronotum separated by a deep clean cut, 

 transverse constriction ; first joint of beak not reaching 

 base of head. 

 y. Second and third ventrals furnished each side with a nar- 

 row, lunate, very finely strigose, opaque area '(fig. 70). 



IV. Ligyrocoris, p. 392. 

 gg. Second and third ventrals without lunate strigose areas. 



V. Orth^ea, p. 397. 

 //. The two lobes of pronotum separated by a shallow obtuse con- 

 striction; first joint of beak reaching base of head. 

 h. Form of body narrowly elongate with long legs; basal joint 

 of hind tarsus, fully three times as long as the others 

 united; hind tibiae with rigid bristles only. 



VI. Zeridoneus, p. 403. 

 hh. Form of body more broadly oval with shorter legs; basal 

 joint of hind tarsus not more than twice as long as the 

 others united; hind tibiae with long setose hairs and with 

 a few bristles near apex. VII. Perigenes, p. 404. 



cc. Head inserted in thorax to eyes ; pronotum without a constricted 

 ring-like collar, sometimes with the front margin depressed or 

 furnished with a row of punctures; clavus with two or three 

 rows of punctures; pronotum strongly constricted to form two 

 lobes, both of which are punctate. 

 i. First antennal surpassing tip of tylus by half or more its 

 length; front margin of pronotum depressed, punctate; sur- 

 face not shining. 

 j. Third and fourth antennals not or but slightly thicker than 

 second ; front lobe of pronotum convex, transverse, nearly 

 as wide as hind one. VIII. Tomopelta, p. 405. 



B0 Except in Orthcea longifl.ua (Dull.) and Perif/enes constrictus (Say). 



