4 HEMIPTERA. 



a. Abdomen with a distinct 

 central furrow, reaching be- 

 yond the middle of the belly. 



** Body broad, ovate 5. PCECILOCORIS. 



ft Body elongate 8. SCUTELLERA. 



b. Ventral furrow wanting en- 

 tirely, or confined to the basal 

 segments of the abdomen. 

 ** Second joint of the an- 

 tennae very short, not 



length of third joint 12. CALLIDEA. 



ft Second joint of the an- 

 tennae about half as long 

 as the third. 



aa. Body elongate .... 11. LIBYSSA. 

 /3j3. Body ovate and con- 

 vex, or nearly hemi- 

 spherical, 

 aa. Scutellum covering 



the entire abdomen . 3. SPH^EROCORIS. 

 bb. Abdomen project- 

 ing on each side . . 13. CHCEROCORIS. 

 t Abdomen with an oblong spot 

 of a peculiar silky texture on 

 each side, near the middle of 

 the penultimate and antepe- 

 nultimate segments. 



a. Base of antennae visible . . 14. PACHYCORIS. 



b. Base of antennae concealed 

 by the produced anterior 



margin of the breast 16. HOM^EMUS. 



2. Head with the anterior portion in- 

 clined at right angles to the vertex. 22. CYPTOCORIS. 

 B. Second joint of the antennae 

 as long or longer than the third. 



a. Second joint very long, more than 



three times as long as the third .... 9. PELTOPHORA. 



b. Second joint never more than double 

 the length of the third ; the two joints 

 sometimes equal. 



1. Sexual organs visible, 

 a. Base of antennae not concealed. 

 * Thorax with a transverse fur- 

 row 23. ZOPHOESSA. 



t Thorax destitute of transverse 

 furrow. 



