charles w. hooker. 5 



Distribution. 



The Tribe Ophionini comprises about thirty genera of 

 which only eight have been found in America. Of these 

 Ophion, Enicospilus and Eremotylus have a world-wide distri- 

 bution, but among the others, most of the species are Ameri- 

 can ; members of the tribe range in America from Sitka, 

 Alaska, to Chubut Territory (Patagonia), Argentina, includ- 

 ing the West Indies. Most of the species are tropical or sub- 

 tropical, but some range into the Boreal Zone ; Ophion bili- 

 neatus apparently ranges from Alaska to Patagonia, Enicos- 

 pilus purgatus from Alaska to Chili, and Thyreodon laticinctus 

 from Central Mexico to Chili. 



Table of Genera. 



1. Discocubital vain angularly broken and appendiculate 2. 



Discocubital vein not angularly broken, straight or bent 3. 



2. Labium abnormally lengthened, nervellus broken slightl}' above 



the middle, nervulus postfurcal to interstitial. 



Agatliopliiona West. 



Labium normal, not lengthened, nervellus broken at or below the 



middle, nervulus antefurcal to interstitial Ophion Fabr. 



3. C\a.vjs simple, not pectinate Retanisia Cam. 



Claws pectinate 4. 



4. Discocubital cell with one or more maculae.. .Enicospilus Steph. 

 Discocubital cell without maculae 5. 



5. Nervellus straight, not broken Opliiopterus Br. 



Nervellus angularly broken 6. 



6. Nervellus broken above the middle 7. 



Nervellus broken at or below the middle 9. 



7. Ocelli large, close to each other and to the tops of the eyes. 



Atliyreoclon Ashm. 



Ocelli small, well separated from each other, and from the tops of 



the eyes 8. 



8. Anterior wing with stigma Ophion Fabr. 



Anterior wing without stigma Thyreodon Br. 



9. Radial vein with the basal half slender, not thickened. 



Ophion Fabr. 



Radial vein with basal half thickened 10. 



10. Base of radial vein straight Ophioniorpha Szep. 



Base of radial vein bent Eremotylus Forst. 



TRANS. AM. ENT. SOC, XXXVIII. 



