OF NORTH AMERICA. 203 



2.-LEUCARCTIA ALBIDA. N. S. (PI. 8, fig. 22, 6 .)* 



$ . — White. Head and thorax white. Sides of the front, next the 

 eyes black. Palpi black, a little whitish below. Thorax beneath 

 white. Antennae black. Abdomen clear yellow ochre above, except 

 the apical segment and the basal hairs which are white. Beneath 

 white. Each segment above has a transverse black spot. There is a 

 lateral row of small black dots, and a faint indication of a sublateral 

 row of the same color. Legs white above. Coxae of anterior pair 

 black, fringed with yellow hairs. Inside of femora yellow ; those of 

 the middle pair only partially so, those of the posterior pair only at the 

 apex of the joints ; tips all touched with black. Tibiae of anterior and 

 middle pairs streaked with dusky inwardly ; posterior pair w^hite. 

 Tarsi dusky beneath. 



Wings pure white, both above and beneath ; the anterior pair im- 

 maculate ; secondaries showing faint traces of a discal spot, and two 

 submarginal spots. 



Expanse of wings, 1.20 inches ; length of body, 0.80 inch. 



Habitat. — Owen's Valley, California, (Coll. Stretch), ? unknown. 



I am indebted for this specimen to Lieut. Wheeler, of the U. S. 

 Exploring Expedition. The specimen is in poor preservation, but 

 may be readily distinguished from L. acrcca, not merely by its smaller 

 size and the absence of markings, which alone, in such genera as 

 this, would scarcely warrrant its separation under a specific name, but 

 by the color of the posterior wings, which are totally different from 

 the well known L. acrcea. It may not be uninteresting to add that I 

 have in my collection a $, exactly corresponding to the foregoing 

 description, which I received from Costa Rica, through Dr. Von Patten. 

 This gentleman's collection was made on the table lands of the interior. 

 I have also, from the same locality, a large notodofitid (.?), likewise 

 identical with a specimen received from Arizona ! When it is remem- 

 bered that I am as yet acquainted with only sis species of Bombycitia from 

 the district of Arizona and its vicinity, it is somewhat remarkable that 

 two of these should be represented in a locality so widely removed as 

 Costa Rica, and we may naturally look for many striking additions to 

 our list of insects as we become more familiar with this as yet almost 

 unknown country. 



* See page 98 ante. 



