l''>() OENKKA OF IIYMKXOPTKR A. 



First recurrent ncrvurc received l>y the seediid suhiiuirjjiiial eell near its 

 middle, or between the niitUIle and apex ; clypeiis % prominent and 

 prolonged ; fifth abdominal segment 9 with a median longitudinal 

 furrow or rima; generally only the head and thorax metallie col- 

 ored .\;;ii|»«>sl4'iii4>ii Smith. 



Body without metallic colors. 



Abdomen .smooth, shining, naked, generally red, or red and black, rarely 

 entirely black. 

 I''iftli abdominal segment J without a median longitudinal furrow or 

 rima; fact' short and broad, subrugose; ocelli not unusually large. 



N|>lie('o<le!« Latr. 



Fifth alxbuninal segment 9 with a median longitudinal furiow or 



rima; face elongate, luirrow. shining; ocelli unusually large and 



prominent l*araS|>lie<ro<l<'!!> Sniith. 



Abdomen generally oi)aque, segments 1-4 or 5 almost always fringed at 

 apex with pale i)ubescence; fifth abdominal segment 9 with a me- 

 dian longitudinal furrow or rima; clypeus 'J, prominent, often pro- 

 longed ; face without long pubescence llsilirtiiN J>atr. 



i\i. — Second submarginal cell much narrowed towards the marginal ; body blue- 

 green, of small size ; legs and antenuie simple in both sexes. 



Coral ilia Latr. 

 Second submarginal cell (juadrate or nearly so, not narrowed towards the 

 marginal; body large ; posterior legs % more or less deformed. 

 .Vpical joint of % antennse elongate, not dilated ; apical margin of the 



abdominal segments sometimes green \'<>lliia Latr. 



Apical Joint of % antenn;e short, dilated, excavated, si)oon shajied. 



ICiiiioiiiia Cress. 

 14. — Third submarginal cell almost as long as the first and second coml)ined, the 

 second elongate, (;uneiform, narrowed and pointed at base, the first 

 recurrent nervure uniting with the second transverse cubital ner- 

 vure; third submarginal cell scarcely narrowed towards the mar- 

 ginal, which is long and narrow Xyl<»<'(»i»a Latr. 



Second submarginal cell rather longer than either the first or third. 



Marginal cell rather short, obtuse at tip. not extending more than its 

 width beyond the apex of the third submarginal cell, which is very 

 much narrowed towards the marginal ; second submarginal cell 

 quadrate, not narrowed above; posterior legs J with long, dense 



jmbescence Oiitris Fabr. 



Marginal cell long, pointed at tip, extending far beyond the ajiex of the 



third submarginal cell ; second submarginal cell strongly iimduced 



at basi' beneath ; maxillary i)alpi 2-jointed. 



I'osterior tibise 9 flattened, dilated and more or less concave, polished 



and fringed with long hair (this arrangement is called the "cor- 



bicula"); sexes three, % 9 ^ Bouilms Latr. 



I'osterior tibiie % 9 outwardly convex, dull and cnvcnd wiili short, 



dense pubescence ; sexes two, % 9 ipallms Newm. 



Second submarginal cell smaller than either tlie first or third. 15. 



1.-,. — Antennie % cons])icuously longer tlian in 9; clyi)eus % nmre or less yel 



lowish 10. 



Antennie % only slightly, or not at all. longer llian in J; clyptus not i)ale 

 colored 17. 



