HEMIPTERA HKTEROPTERA. 



55 



-+• First and second joints of the rostrum equally 



long, or the first shorter than the second. 

 ++ Disk of the hind lobe of the prolhorax bituber- 



culate hind ward. 

 un Apical angles of all the abdominal segments, 



or at least of the first and second, promi- 

 nent. - Aristippus. 

 u?>ms>» Apical angles of the abdominal segments not 



prominent. .... Helonotus. 



■»-+♦+ Hind lobe of the prothorax not bituberculate. 

 *o Hind angles of the prothorax extended. Disk 



of the scutellum with a much elevated and 



sometimes dichotomous tubercle. - - Pristhesancus. 



* Scutellum with a slightly elevated tubercle. - Lanittus. 



*»*c?> Hind angles of the prothorax not extended. 

 ** Scutellum with no tubercle. 

 Ante-ocular part of the head shorter than the 



post-ocular. First joint of the antennas 



longer than the head, the prothorax, and the 



scutellum together. Fore lobe of the pro- 

 thorax with two high tubercles hind ward ; 



fore angles with an acute tubercle, which is 



inclined outward. Side angles of the hind 



lobe of the prothorax elongated. Legs 



rather long. - Archilochus. 



©0 Ante-ocular part of the head about equal to the 



post-ocular, the former a little lower than 



the seat of the ocelli. First joint of the 



antennae somewhat longer than the head. 



Prothorax with no discal tubercles ; fore 



angles obtusely tuberculate; lateral angles 



of the hind lobe obtusely rounded, not pro- 

 minent. Legs rather short ; thighs towards 



the tips slightly tapering; fore thighs 



incrassated ; tibia? and fore thighs equally 



long; hind thighs extending almost to the 



third apical part of the abdomen ; tibia; 



6lightly thickened at the tips. - - Saxitius. 



The following description of Saxitius, translated from the same 

 author, differs somewhat from the preceding one: — 



Head and prothorax equally long, the former 

 cylindrical; post-ocular part slightly tapering 

 hindward, a little longer than the ante- 

 ocular part, which is hardly lower than the 

 seat of the ocelli, the latter being very 

 slightly raised. First joint of the rostrum 

 short, just shorter than the ante-ocular part 

 of the head; second about twice as long as 

 the first. Antennae rather short; first joint 

 a little longer than the head. Lobes of the 

 prothorax with small spines or acute 



