ORTALID^ — CEROXYS. 125 



longitudinal vein is weak and indistinct soon after its middle, so 

 that it appears interrupted a long distance before the margin of 

 the wing. 



Hab. New York (Osten-Sacken) ; Virginia; Texas (Belfrage). 



Observation. — The description of Herina ruficeps by v. d. 

 Wulp, contains only one datum which might render its identifi- 

 cation with T. humilis doubtful. He says that the third antennal 

 joint is four times as long as the second, while in all my speci- 

 mens it hardly reaches three times its length. As, in other 

 respects, the agreement of the very good description is perfect, 

 I have not the slightest doubt that this difference arises from a 

 different mode of viewing or measuring the antennae. Unfortu- 

 nately, the name given by Mr. v. d. Wulp cannot be preserved, 

 as it has been preoccupied by Fabricius. 



Gen. IV. CEROXYS Macq. 



Charact. — Head rather rounded. Front very broad, somewhat narrowed 

 above, without stripe. The perpendicular diameter of the eyes is 

 much larger than the horizontal one. Cheeks of medium breadth. 



Third antennal joint upon its upper side distinctly excised, very much 

 pointed at the tip. Arista distinctly pubescent. 



Thorax, upon its middle, with bristles as far as its anterior portion. 



First longitudinal vein with bristles upon its end only ; the fourth 

 longitudinal vein not curved forward. The posterior angle of the 

 anal cell acute, but not prolonged in the shape of a lobe. 



The genus Geroxys contains species which are very much 

 alike ; the thorax and abdomen are thickly covered with yellow- 

 ish or grayish dust; the head is yellow. The picture of the 

 wings, consisting of comparatively large blackish-brown or black 

 spots, is the same in all the species ; it consists of seven spots, 

 the first of which lies on the basis of the submarginal cell, the 

 second upon the end of the stigmatical (third costal) cell ; the 

 third covers the small and the fourth the posterior crossvein ; the 

 last three spots lie on the ends of the second, third, and fourth 

 longitudinal veins; the last two generally coalesce completely, 

 while the one placed at the end of the second vein is generally 

 less completely united with them. 



The species are easily distinguished by the shape and color of 

 the third antennal joint, by the presence or absence of a dark 

 crossband on the posterior margin of the abdominal segments, by 



