ORIMARGA. 121 



issues from the first at about the middle of the length of the 

 wing ; the praefurca is angularly bent near its basis (in my speci- 

 mens even with a vestige of a stump of a vein); its remaining 

 portion is nearly straight, the length of this portion being about 

 two-thirds of the submarginal cell ; the portion of the second 

 longitudinal vein which is beyond the origin of the third, is very 

 gently arcuated ; the marginal cross-vein is at about the middle 

 of the distance between the tip of the first longitudinal vein and 

 the inner end of the submarginal cell ; the stigma is indistinct, 

 forming an elongated streak on both sides of the first longitudinal 

 vein, between the tip of the auxiliary vein and the marginal cross- 

 vein ; the first posterior cell is a good deal shorter than the sub- 

 marginal, as the small cross-vein is about opposite the middle of 

 the distance between the inner end of the submarginal cell and 

 the marginal cross-vein ; the veins inclosing the first posterior 

 cell are straight, parallel, converging at the tip only ; the inner 

 end of the second posterior cell is not quite in one line with the 

 small cross-vein, but projects a little towards the basis of the 

 wing ; the third posterior cell is short, petiolate (and hence, it is 

 the posterior branch of the fourth vein which is forked) ; the 

 fourth posterior cell is nearly twice the length of the second, as 

 the great cross-vein is removed to the middle of the wing, a little 

 beyond the origin of the second vein ; fifth longitudinal vein 

 nearly straight ; the seventh, for nearly one-half of its length, 

 runs so closely along the sixth, that they appear coalescent ; 

 beyond this, however, the seventh vein diverges from the sixth 

 and runs in a nearly straight line towards the margin of the wing. 

 The venation of this genus along the anterior margin has an 

 unmistakable resemblance to that of Dicranoptycha ; they have 

 in common the great distance between the tips of the auxiliary 

 and of the first longitudinal vein, the length of the latter, the 

 shape and position of the stigma, and the position of the marginal 

 cross-vein ; both have distinct empodia. The differences (absence 

 of a discal cell and unusual position of the great cross-vein in 

 Orimarga) are obvious ; but these differences notwithstanding, 

 I incline to believe that the place of the present genus is next to 

 Dicranoptycha. We ought not to overlook at the same time the 

 remarkable analogy in the structure of the thorax of Orimarga 

 and of Toxorrhina : in both the same oblong shape, comparatively 

 narrow, when viewed from above, a long neck, and a remarkable 



