93 

 NEW FORMS OF NORTH AMERICAN COSSID^E. 



By James S. Bailey, A.M., M. D. 



Cossus Angrezi. n. S. 



? . Head somewhat narrow on the vertex. Collar and head 

 yellowish gray, thorax black ; the edges of the tegulae shaded 

 with yellowish gray. Fore wings with a nearly white ground, 

 shaded with black, and with black reticulations. Hind wings yel- 

 lowish gray, mottled with blackish outwardly. The fore wings 

 have the costal edge pale, marked with black ; the black shading 

 obtains on costa at apical third, and over the whole wing at ter- 

 minal third, extending obliquely downwards and inwards ; there 

 are a series of interspacial longitudinal black streaks before 

 the margin, more or less defined. Fringes whitish, dotted with 

 black opposite the ends of the veins, which latter conversely are 

 whitish. Thorax shaded with yellowish gray behind. Abdomen 

 dark gray. Beneath, the wings repeat the markings very distinctly, 

 owing to the strong contrast of the pale ground color with the 

 black markings. Expanse, 82 mm. i ? . Wells, Elko Co., Ne- 

 vada. From the late Mrs. Caroline Chase. Type, coll. James 

 S. Bailey. 



COSSULA. n.g. 



Size small. Antennse of the female bipectinate to the tips, the 

 inner series one-third of the length of outer pectinations. Eyes 

 naked. Clypeus relatively broad. Labial palpi well developed, 

 squamous, third article small ; the palpi extend as far as the 

 front. Tongue wanting. Hind tibiee pilose. Fore wings rounded 

 at apices. Wings broad. 



The neuration of Cossula is peculiar. The fore wings of 

 Cossula are 12 veined. Vein 5 belongs to the series of median 

 nervules, and sets back along the middle of the discal cell, divid- 

 ing it into two fields, to the base of the wing. Vein 6 is rather 

 weak ; 8 out of 7 ; veins 9 to 1 1 are simple, thrown off at elbows 

 or angulations of the subcostal vein. The type of neuration of 

 Cossula, as well as other Cossidcs examined, does not suggest an 

 affinity with Castnia, as, I believe, Mr. Butler views the affilia- 

 tions of the group. We must rather expect to find that the Tor- 

 trices and Cossidce have been, in times past, nearer allied than 

 at present. The CossidiB are a low form of BombycidcB, and the 

 discovery of small forms like the present materially alter our 

 ideas of the group based on the large of Europe. 



Natural History. 



We are indebted to the intelligent and indefatigable labor 

 of Mr. Albert Koebele for the discovery of this interesting 

 insect, which he found in the vicinity of Tallahassee, Florida, 

 during May, from the 9th to the i6th, 1880. The larvae were 

 found boring species of oak and hickory. The presence 

 of the larvae were detected by the gnawings of the wood being 



