REVISION OF THE OECOPHORIDAE — CLARKE 129 



Larva.— Length 11-12 mm. Head light brown with a heavy suffu- 

 sion of dark brown on the margins, epicranial sutures and, especially, 

 beneath. Body subcylindrical, considerably thicker at middle and 

 tapering toward each end. Thoracic and abdominal segments light 

 yellowish green, lighter ventrally. Prothoracic shield light yellowish 

 brown. Thoracic legs yellowish with joints edged with brown. 

 Tubercles large, black; spiracles edged with brown. 



The larvae of canella are often abundant, and their work is char- 

 acteristic and easily recognized. Early in spring the tubes, formed 

 by the larvae from tied terminal leaves, are conspicuous as "beaked" 

 processes at right angles to the long axis of the stem. Frequently 

 several tubes are constructed by one larva so that it becomes necessary 

 to inspect several tubes before the larva is finally located. From the 

 terminal portion of the tube the woolly covering of the leaves is ejected, 

 this often forming a conspicuous mass. Pupation occurs in debris 

 at the base of the plant. In the laboratory larvae pupated on April 

 24 and 25, and the moths emerged May 8, 1934. 



The species is exceedingly difficult to rear. In the spring of 1935 

 nearly 400 larvae were collected but only 19 moths were obtained. 

 This might suggest faulty rearing conditions but three systems were 

 used with the same results. This and the fact that in nature the 

 moths are scarce, although the larvae are abundant, suggest a natural 

 high mortality. 



Alar expanse, 16-20 mm. 



Type. — In the United States National Museum {canella) ; A. F. 

 Braun collection, Cincinnati, Ohio {cogitata). 



Type localities. — Pullman, Wash, {canella) (Piper) ; Aweme, 

 Manitoba {cogitata). 



Food plants. — Antennaria luzuloides T. & I. (Clarke) ; Gtmphalium 

 (J. McDunnough). 



Distribution. — ^Western United States and Canada in the Rocky 

 Mountain and intermountain areas; northeastern United States and 

 eastern Canada. 



United States records 



California: Warner Mountains, 3 mi. E., Davis Creek, Modoc County, alt. 5,500 

 feet, 3 (8-10-VII-1922, A. W. Lindsey). 



Connecticut: New Haven, $ (Dr. Britten), 



Idaho: Viola, Moscow Mountains, 5 (12-VI-35, J. F. G. Clarke [reared]). 



ITe-w Hampshire: Portsmouth, $ (VI-9-05, C. E. Montgomery). 



New York: Big Indian Valley, Catskill Mountains, 9 (IX-2-10, R. F. Pearsall) ; 

 Iliou i$, VI-25-13, 2 5 9, VI-25-13, VlI-11-17, H. McElhose) ; also Wil- 

 mington and Ithaca (according to Forbes) ; Ithaca, 9 (30-VI-31, A. B. Klots) . 



V/ashington: Kamiack Butte, Whitman County, S $ S and 9 9 9 (May 8, 1934; 

 Jlay 16-June 18, 1935, J. F. G. Clarke [reared] ) ; Pullman, S (2 September 

 '98). 

 286614—41 7 



