CLEAR-WING MOTHS OF FAMILY AEGERIIDAE 113 



Sesia anicricana Beutenmuller, Mem. Amer. Miis. Nat. Hist., vol. 1, p. 6, p. 2W, 



1901. 

 Synanthedon americana McDunnough, Check list of the Lepidoptera of Canada and 



the United States of America, pt. 2, No. 8724, 1939. 



Male. — Antennae black, moderately dilated, pectinations short and fine. 

 Labial palpi blue-black above, orange beneath. Head blue-black, orbits 

 silvery white. Thorax blue-black, with an orange patch on each side 

 beneath. Abdomen blue-black, the fourth segment entirely orange, the 

 sides orange from the base to segment 4 and sometimes segment 2 nar- 

 rowly edged with orange above; anal tuft wedge-shaped, black. Legs 

 metallic black, posterior tibia shaded with brown on upper half and at 

 the union with tarsus. Forewing transparent opalescent; veins, strong 

 costa and discal mark, and broad outer margin shiny black; fringes lus- 

 trous brown ; underside pale orange at the base. Hindwing with narrow 

 margin and small discal mark. 



Female. — Like the male except : antennae simple ; anal tuft narrow, 

 blunt at tip. 



Expanse: Male 23 to 26 mm., female 24 to 27 mm. 



Distribution. — Nevada, northern California, Oregon, Utah, Idaho, 

 Montana, Washington, British Columbia. 



Type. — Male. In the American Museum of Natural History. 



Remarks. — Trees rather than shrubs of alders are attacked. The 

 larvae bore under the bark in shallow, winding channels of the wood, 

 causing the bark to blister and die. Such places may have as many as 

 a dozen orifices from which moths have escaped. Alders exposed along 

 roadsides and streain beds are preferred. The injury to alder trees very 

 much resembles that caused to maples by Sylvora acerni. The moths re- 

 corded from White River Camp, Mount Rainier, Wash., were captured 

 on the flowers of pearly-everlasting, Anaphalis margaritacea. 



A long series of reared specimens of both sexes is labeled Riggins, 

 Idaho (Alnus rhombifolia) , June 4, 1914 (Hopkins U. S. 11590). Other 

 records are Burns, Oreg., June 1926 (B. G. Thompson) ; Almata, Wash., 

 May 11, 1901, one male (C. V. Piper) ; Uinta Mountains, Utah, one 

 male (D. E. Beck) ; White River Camp, Mount Rainier, Wash., 

 August 8, 1935, 2 males (Joseph Wilcox). 



THAMNOSPHECIA FULVIPES (Harris) 



Aegeria fulvipes Harris, Amer. Journ. Arts and Sci., vol. 36, p. 312, 1839. 



.Sesia fulvipes Boisduval, Histoire naturelle des insectes : Species general des 



lepidopteres heteroceres, vol. 1, p. 439, 1874. — Beutenmuller, Bull. Amer. 



Mus. Nat. Hist., vol. 8, p. 135, 1896; Mem. Amer. Mus. Nat. Hist., vol. 1, pt. 6, 



p. 290, pi. 31, fig. 28, 1901. 

 Synantliedon fulvipes McDunnough, Check list of the Lepidoptera of Canada and 



the United States of America, pt. 2, No. 8718, 1939. 



Male. — Antennae slender, pectinations short, whitish before tips. Labial 

 palpi orange beneath, black above. Head and thorax coppery black, the 



