52 WILLIAM G. DIETZ, M. D. 



near the base" in the author's description, of which I could not see 

 any evidence. The head and thorax in this specimen is sordid och- 

 reous, the latter darker anteriorly. It is about the size of a small 

 pellionella. 



Occidentella Group. 



The few species comprising this group are moths of more than 

 average size; head yellowish or white, color of forewings brown, 

 with more or less white; stigmata distinct, Hindwings as wide as 

 the forewings, costa not retuse. 



They are distinguished as follows: 



With dark purple Hue from middle of costa to end of disk behrensella. 



Without such a line. 



Second discal spot transverse; plical spot before the middle. 



occidentella. 



Second discal spot round, plical spot not before the middle- • tuseanella. 



T. behrensella Ch.— Dyar's List, p. 570, No. 6494.— "Palpi yellowish; 

 hairs of the face and vertex yellowish, mixed with some of a darker hue; an- 

 tennae fuscous, silvery tinged; primaries brownish, suffused with pale purple, 

 and paler towards the dorsal margin, a reddish or purplish brown line extends 

 along the costal margin to about the middle) when it leaves the margin, passing 

 backwards to the end of the disc, becoming, also, wider; apical part of the wing 

 pale purple, or purple-slate color, with white scales intermixed ; cilia pale straw 

 color; under surface and legs whitish, except the anterior surfaces of the first 

 and second pairs of legs, which are brown, annulate with yellowish white at the 

 joints. Al. ex. ? inch. Named for Mr. J. Behrens, of San Francisco, from whom 

 I reieived it." 



This is the author's description, to which I have nothing to add, 

 as the insect is not known to me in nature. I place this species 

 tentatively into the present group. 



T. occidentella Ch. — Dyar's List, p. 573, No, 6532.— Palpi fuscous brown, 

 outer half of terminal joint of labials whitish. Head creamy-white. Antenna- 

 deep fuscous, basal joint white. Thorax dark brown ; anterior part, except 

 patagia. white. Forewings moderately wide, obtusely pointed, ground color 

 creamy-white, overlaid with dark brown or almost black, the latter most dense 

 in basal two-fifths and in the apical part of the wing, also more or less along the 

 margins; on the apical third of costa are four or five short oblique lines which 

 extend into the cilia; a large, somewhat transverse spot at end of cell, another 

 well marked and nearly rectangular; on the fold before the middle extending as 

 a streak towards the base, immediately exterior to these spots, the white ground 

 color appears as a more or less conspicuous white spot or dash. Cilia fuscous, tra- 

 versed by several pale lines in costal and dorsal portion. Hindwings fully as 

 wide as forewing, obtusely rounded at apex, gray, dusted with fuscous and with 

 an ochreous tinge; cilia gray. Abdomen grayish fuscous above, underside of 



