CHARLES W. HOOKER. M 



Wings (PL II, fig. 8). — The wings are quite large, usu- 

 ally hyaline and often irridescent, though frequently, espe- 

 cially in Thyreodon and Athyreodon, more or less colored 

 with fuscus, fulvus or fuliginous, sometimes with a violet 

 reflection, and in some species entirely black or cyaneous. 

 The surface is sparsely covered with very fine, short hairs, 

 but a glabrous area frequently occurs in the discocubital cell. 

 It has seemed best to follow in this paper the nomenclature 

 of veins and cells used by Cresson and others, and this is 

 given on Plate II, figure 8. 



Anterior wing. — A well developed stigma is present in 

 most members of this tribe, but in Thyreodon and Athyreodon 

 it is lacking. The discocubital cell receives both recurrent 

 veins — which vary in length in different species — and in the 

 Genus Enicospilus contains one to three yellow chitinous 

 thickenings called maculae. The number, size and shape of 

 these maculae seem constant in some species but in others 

 variation is evident. The discocubital vein is angularly 

 broken, angularly bent or arcuate, sometimes slightly sinu- 

 ous, and this difference in shape has been given generic 

 value. In Agathophiona, and Ophion it is usually angularly 

 broken and appendiculate with a short stub of a vein — ap- 

 pendix — extending from the point of the angular out into the 

 discocubital cell — but in some species only angularly bent 

 or arcuate and without an appendix. In the other genera it 

 is arcuate or slightly sinuous. The radial vein is slender 

 throughout and straight, except in the Genera Eremotylus 

 Enicospilus and Ophiomorpha where it is thickened and more 

 or less bent, or in some species angularly broken near the 

 stigma. This is, I believe, the older condition showing where 

 the second transverse cubital vein originated. The place of 

 connection of the transverse median vein, or, as I have called 

 it for brevity, nervulus (thereby following European writers), 

 and the median vein, varies in difEerent species ; in some it 

 meets the end of the basal vein — when it is called interstitial 

 — or is nearer the body — prefurcal or antefurcal, in these cases 

 uniting with the discoidal vein (which is Cresson's name for 



TRANS. AM. BNT. SOC. , XXXVIII. (2) 



