[131] ON SOME SPECIES OF Cossus. 243 



and a triangular spot having its apex on the costa at its 

 outer third. Costa with about fourteen black lines between the 

 base and vein 12, and three lines between veins 12 and 11, of 

 which the outer, at the junction of vein 11 with the costa, is 

 broad and extends inwardly to vein 10 ; another broad, black 

 costal line each at the junction of veins 10 and 9 with the 

 costa these last three spots (also shown on the upper sur- 

 face of the wings) are the equivalents of the three anteapical 

 costal white dots of many of the Noctuidse, designated by 

 Guenee as the virgular spots (traits virgulaires). 



Secondaries, from inner margin to vein 1 b, clothed with 

 fuscous hairs as above ; thence to costal margin with ash 

 scales, nearly plain between Ib. and 2 ; reticulated between 

 the median nervules (veins 2-5) and to vein 7 as on the prima- 

 ries above ; thence to costal margin, the interspaces barred 

 by black lines, of which about eighteen are seen on the mar- 

 gin. A fuscous cloud borders the median nerve from the 

 base to within its branches. Thorax above and beneath 

 covered with pale ash scales. Tibiae and tarsi ash, annulated 

 with black. Abdomen above, apparently (the body of the 

 example is much greased) concolbrous with the secondaries 

 above. Antennae black, strongly bipectinate, like those in 

 G. robinice. 



Expanse of wings, 3.35 inches ; length of body, 1.75 inch. 



Habitat, etc., Texas, Rio Grande. Described from one fe- 

 male, in the collection of Mr. B. Neumo3gen, New York city 



Cossus undosus n. sp. 



A Cossus was taken by Mr. S. H. Scudder, at Green River 

 Station, Union Pacific Railroad, Wyoming, resting on a " cot- 

 ton-wood" (Populus balsamifera, probably), together with a 

 pupa case projecting from the same trunk. Through the 

 kindness of Mr. Scudder, these have been placed in my pos- 

 session. The moth unfortunately is a wreck, in no condition 

 for accurate description, having lost its antennae, one-half of 

 one pair of wings, and one-third (the apical portion) of the ' 

 other. 



It differs from any of our known species in markings and 

 sqnammation. Both pair of wings in their ground color are white, 

 and are crossed by numerous, narrow, black, transverse lines. 

 Of these the most prominent one crosses the outer third of 



