290 HYMENOPTEKA. 



6. Thyreodon ornatipennis. 



Thyreodon ornatipennis, Cresson, Proc. Acad, Phil. 1873, p. 376 ( ? ) \ 

 Hab. Mexico, Orizaba (Sumichrast J ). 



7. Thyreodon rufithorax. (Tab. XII. fig. 15, 2 .) 



Ferrugineus ; vertice, flagello antennarum, abdomine, pedibus postick tarsisque intermediis, nigris ; alia hyalinis, 



fuseo fasciatis. 2 . 

 Long. 33 millim. 



Hab. Panama, Bugaba 800 to 1500 feet (Champion). 



Face rugose, the clypeus punctured ; mesothorax and scutellum finely punctured, the 

 mesopleurae finely striated ; metanotum with two irregular keels, united by cross ones, 

 going down the centre ; there is an equally strong keel down the side, united to the 

 central keels by six strong transverse ones.; metapleurae with indistinct, rather widely 

 separated, keels. Abdomen of the usual shape and with a steel-blue tinge. The base 

 and apex of the wings are smoky ; the apical three fourths of the radial cellule and a 

 band along the basal nervure being deep black. 



OPHION. 



Ophion, Fabricius, Ent. Syst. Supp. p. 210. 



A genus of wide distribution over the globe. The very uniform coloration of the 

 species, and the slight structural variations which they show, render their identification 

 Very difficult. Ophion is divisible into two groups : — 



1. With horny points in the fore wings. 

 Eniscopilus, Stephens, 111. Brit. Ent. Mand. vii. p. 126 (1835). 



In the same species of this group the inner (and smaller, when present) spot tends to 

 become obsolete ; and in some species of true Ophion, e. g. O. curvinervis, the spots might 

 almost be said to be present, although transparent. I am not at all sure if the shape 

 of the outer horny point can be depended upon as an aid to specific distinction ; it 

 seems to me to vary considerably. 



A. First cubital cellule with two homy points. 

 a. Stigma yellow or fulvous. 



l. Ophion (Eniscopilus) mexicanus. (Tab. XII. fig. 23.) 



Ophion mexicanus, Cresson, Proc. Acad. Phil. 1873, p. 374 ( $ ) l . 

 Hab. Mexico, Cordova (Sumichrast l ) ; Guatemala, San Geronimo (Champion). 



This species may be known from the following by the black antennae and by the long 



