96 ENTOMOLOGICAL NEWS. [Mar., "06 



Cosmosoma rubrigutta n. sp. Exp. 40 mm. Wings hyaline ; antennae 

 black ; head black with blue scales on top ; collar and patagiae orange; 

 thorax black with blue spots ; abdomen black with three metallic blue 

 spots on the segments, arranged in a triangle ; legs fuscous. Primaries 

 as in auge, except that the costa, base and interior margins are orange ; 

 there is also an orange spot at the end of the cell, surrounded with black ; 

 this spot is 2 mm. in length. Secondaries, basal half orange, outer 

 part black. 



C. impar Walk. Biol. Cent.-Amer. Het. iii, pi. 71, f 22, 

 looks very much like this species except in relation to base of 

 the secondaries and the discal spot. 



Described from one specimen taken by Prof. F. H. Snow at 

 Douglas, Arizona, August. 



Pyrgus occidentalism sp. 



This is a smaller and generally whiter species than tessellata 

 Scudder, and is found in the Northwest territory and in the 

 southwest generally. I hope to give figures of this form in 

 the near future. Prof. Snow sent me specimens from San 

 Bernardino Ranch, CochiseCo., Arizona, August, and Browns- 

 ville, Texas. 



There has been a terrific mix up in the literature in regard 

 to tessellata Scud., syrichtus Fab., and montivagus Reak. All 

 authors have them incorrectly placed. Tessellatus and syr- 

 ichtus are abundantly distinct and montivagus is a synonym of 

 syrichtus. 



Description of American Moths of the Genus Ceros- 



toma. 



BY AUGUST BUSCK. 



U. S. National Museum, Washington, D. C. 



The genus Cerostoma Latreille, of which many species are 

 common in Europe, has not yet been recorded from and pro- 

 bably is not found in eastern United States, but is evidently 

 amply represented in the West. 



In a revision of the genus and its near allies (Journ. N. Y. 

 Ent. Soc. ix, p. 45, 1903) the writer recorded eleven species 

 from the West and Southwest, and I am now able to add four 

 more striking forms to the known species of this pretty group 

 of Microlepidoptera. 



