NATHAN BANKS. 207 



10. Prosternum distinct ; hind tibia more or less thickened. 



Anisoptera. 

 Prosternum not distinct ; hind tibia not thickened. 



Syinphrasis. 



In the type of Drepanictis {D. gayi Blanch.) the antennae 

 are wide apart at base ; the pronotum very short ; costal 

 area reaches to the stigma, and has twenty-five cross-veins, 

 some of them forked; the radial cells long, the first with 

 five branches, the second with two, and the third with five ; 

 the subcosta does not run into the radius at stigma but con- 

 nected thereto by a short cross-vein; the costals beyond 

 stigma are forked. 



MantisPa chilensis Hag. is a Gerstaeckerella. The front 

 femora are not much more swollen than in Therestria ; the 

 vertex is tumid ; no branch from first radial cell, two from 

 the second, three from the third. 



Mantispa delicatula Westw. is a Theristria, the antennae 

 are wide apart at base ; the long spine on femora I is longer 

 than the width of the joint ; first radial cell with one branch, 

 second with three branches ; in the hind-wing cubitus not 

 bent toward anal. 



Ditaxis biseriata Westw, In hind-wings the cubitus is not 

 bent toward anal ; the antennae small and wide apart : ver- 

 tex strongly tumid ; hind tibiae long and slender; the prono- 

 tum coarsely wrinkled. 



The species of Anisoptera in the Oxford Museum (West- 

 wood's types) may be tabulated as follows : 



1. Stigma of fore-wing about four times as long as broad ; front legs 



all pale 2. 



Stigma not more than three times as long as broad ; front legs 

 marked or dark 5, 



2. Fore-wings with dark marks 3. 



Fore-wings not with dark marks 4. 



3. A band before middle of the wing, and the tip dark ; stigma yellow 



(fig. 41) fasfiatella. 



Two dark spots behind stigma ; stigma also dark leiiella. 



4. Veins black; stigma dark; smaller; first radial cell with two 



branches .se<iuella. 



Veins marked with yellow ; stigma yellowish ; larger ; first radial 

 cell with three branches iridella. 



TRANS. AM. ENT. SOC. , XXXIX. 



