THE CANADIAN ENTOMOLOGIST. 319 



The third species is at first sight very easily confused with luxa ; a 

 glance at the tibife will suffice, however, to separate it, for they are all 

 unarmed, as in im macula. The front has a large corneous heart-shaped 

 process with raised edges and the infra-clypeal plate is very distinct. 

 Although differing considerably in outward appearance from the species 

 at present included therein, it seems to belong in the genus Oslaria Dyar. 

 As it appears to be undescribed, we would propose the W2,vi\t pura for it, 

 and append following description : 



Oslaria piira^ n. sp. 



Front, thorax, abdomen and primaries creamy-white; t. a. and t. p. 

 lines faintly outlined in brown : the former from costa at ]i from base, 

 irregularly dentate, with two darker brown dots at intersections of median 

 and anal veins ; the latter well beyond reniform, midway between it and 

 outer margin, parallel with margin, slightly dentate and with darker brown 

 dots at intersection of veins ; orbicular and reniform outlined in brown ; 

 former small, round ; latter large, constricted in middle, and connected 

 with inner margin by faint brown shade ; on costa between orbicular and 

 reniform a slight brown shade ; fringes but slightly darker than wings ; 

 secondaries pure white. 



Beneath white shaded with brown towards apex of primaries and 

 with indistinct postmedial band on same. Expanse, 28 mm. Described 

 from 5 (j s, 10 9 s. Christmas, Gila Co., Ariz. Types, Coll. Barnes. 



The above description was made from a clearly-marked specimen. 

 There is a great tendency for the raaculation to become indistinct, 

 especially in the males, leaving only the dots at intersection of veins 

 distinct. In one $ specimen there are traces of a dotted median line on 

 secondaries. 



The fourth and last species belongs in the group v/ith unarmed tibiae ; 

 its frontal structure is that of the genus Lythrodes Sm., consisting of a 

 corneous protuberance with raised edges, containing a prominent vertical 

 plate ; infra-clypeal plate is present ; the fore tarsi are also shot, with large 

 terminal claws, agreeing in this respect with Smith's characterization of 

 the genus. It differs greatly from L. radiata and vetiosa, but seems to 

 approach more closely semihina Sm. in general appearance. We propose 

 to call it tripunda, with following description : 



Lythrodes tripujicta, n. sp. 



Head, thorax and wings white, primaries suffused with light brown, 

 especially in median and subterminal areas. A small brown basal dot, 



