380 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 part 3 



19. Genus Diapetimorpha 



Figure 317,b 



Diapetimorpha Viereck, 1913, Proc. U.S. Nat. Mus., vol. 44, p. 564. Type: 

 {Cryptus armatus Ashmead) =introita (Cresson); original designation. 



Front wing 3.4 to 11.5 mm. long; body moderately stout; frons 

 unarmed; clypeus moderately large, rather evenly convex except that 

 it is a little flattened or reflexed near apical margin, its apical margin 

 broadly arcuate with a faint, rounded median point that often is 

 wealdy divided into a faint pair of points; mesoscutum moderately 

 convex, mat to polished, its punctures medium sized to very fme, 

 rather dense to separated by about 2.0 their diameter; notaulus sharp, 

 usually reaching to middle of mesoscutum; epomia usually weak; 

 propodeum rather strongly convex, its spiracle round, its basal carina 

 strong and complete, its apical carina in the female forming strong 

 sublateral crests or teeth, elsewhere usually weak or absent; apical 

 carina in the male less strongly modified, usually complete and regular 

 or forming rather weak sublateral crests; areolet small or very small, 

 roughly pentagonal or quadrangular, the second intercubitus absent 

 or vestigial; ramellus absent; nervulus opposite basal vein or approxi- 

 mately so; second discoidal cell moderately narrowed basally; apical 

 half of mediella strongly arched; nervellus broken below the middle; 

 axillus close to anal margin; first abdominal segment moderately long, 

 its spiracle far beyond the middle, rather strongly widened apically, 

 with a lateral subbasal triangular tooth (strong and sharp in female, 

 weaker in male), its dorsolateral and ventrolateral carinae weak or 

 obsolete, its median dorsal carinae absent or in female often present 

 as short, blunt traces on basal part of postpetiole; second tergite mat, 

 with fine, dense punctures and dense, short hairs, especially in female; 

 tergite 7 frequently with a median white spot; ovipositor sheath 

 about 0.50 as long as front wing; ovipositor moderately stout, some- 

 what compressed, its tip more or less sagittate. 



This is a large genus of small or medium sized, mostly bright- 

 colored species. The males are usually differently colored from the 

 females. Eight species are in the southeastern quarter of the Nearctic 

 region. The rest of the genus is Neotropic. 



The characteristic habitat of the species is low grassy or weedj^ 

 vegetation, some species usually in the sun and some in the shade. 



Keys to the Nearctic species of Diapetimorpha 



MALES 



1. Propodeum black and yellow or black and wliite 2 



Propodeum fulvous or ferruginous, sometimes with indistinct whitish mark- 

 ings 4 



