4 U. S. NATIONAL MUSEUM BULLETIN 216 part a 



are sharply different, and thus it seems that the similarity of the 

 adults is due to convergence rather than to a close relationship. 



Key to the tribes of Gelinae 



1. Wings fully developed, the front wing longer than the thorax 2 



Wings absent or vestigial, the front wing shorter than the thorax ... 4 



2. Second recurrent vein with two bullae or rarely with one, nearly always sloping 



outward posteriorly so that posterodistal corner of second discoidal cell is 

 somewhat longer and more pointed than anterodistal corner; face of male 

 rarely marked with white or yellow; propodeum usually areolated, with 



longitudinal as well as transverse carinae 1. Gelini (p. 4) 



Second recurrent vein with a single bulla, usually not sloping outward pos- 

 teriorly and usually meeting subdiscoidal vein at a right angle; face of male 

 frequently marked with white or yellow 3 



3. Dorsal rim of metanotum with a posterior sublateral projection opposing front 



end of lateral longitudinal propodeal carina; propodeum with longitudinal 

 carinae (at least the basal part of the lateral longitudinal carina present) as 

 well as transverse carinae, or in some females only transverse carinae are 

 present but in these the basal transverse carina is weak or absent and the 



apical transverse carina strong 2. Hetnigasterini (p. 6> 



Dorsal rim of metanotum without a posterior sublateral projection (though 

 sometimes there is such a projection just below the dorsal rim) ; propodeum 

 without longitudinal carinae except for often those bordering the median 

 basal area and rarely others; if only one transverse propodeal carina is 

 present it is the basal carina rather than the apical one (except in Echthrus 

 and a few other cases) 3. Mesostenini (p. 7) 



4. Wings entirely absent 1. Gelini (in part; (p. 4) 



Wings present as stubs 5 



5. Lateral longitudinal carina of propodeum absent basad of propodeal spiracle; 



fourth tarsal segment, as seen from below, sometimes deeply bilobed. 



3. Mesostenini (in part) (p. 7) 



(some specimens of Sphecophaga and some females of Agrothereutes) 



Lateral longitudinal carina of propodeum present basad of propodeal spiracle; 



fourth tarsal segment not at all or only weakly bilobed 6 



6. Propodeum with basal transverse carina 1. Gelini (in part) (p. 4) 



Propodeum without basal transverse carina 2. Ilemigasterini (in part) (p. 6) 



(some females of Aplesis and of Opidnus) 



m 



1. Tribe Gelini 



Front wing normally 2 to 9 mm. long (wings sometimes vestigal 

 or absent) ; apex of clypeus various, frequently with a median pair 

 of small teeth; head of male usually entirely black; areolet complete, 

 open, or sometimes not formed; second recurrent vein nearly always 

 sloping outward posteriorly so that outer hind corner of second 

 discodial cell is somewhat longer and more pointed than is outer 

 front corner; second recurrent vein usually with two bullae, but 

 occasionally with one; dorsal rim of metanotum usually with a small 



