CLEAR-WING MOTHS OF FAMILY AE(.;ERIIDAE 17 



Femora of forelegs shiny white on outer side and black on inner side, of 

 middle legs and hindlegs mixed black and white ; tibiae of hindlegs bluish 

 black, broadly banded sordid white before and behind the anterior spurs ; 

 first tarsal joint black, slightly mixed with white, posterior joints black. 

 Forewing with narrow ochreous areas before and behind the large square, 

 black discal mark ; costa and broad outer margins black and a mixture of 

 black-and-white scales between the veins; beneath shaded heavier with 

 whitish scales than above. Hindwing transparent, veins and narrow mar- 

 gins black, fringes dull black. 



Female- — -Antennae black, annulated with yellow scales on undersides 

 toward the base. Labial palpi bright yellow. Head above heavily scaled 

 with black, mixed with yellow in front and at the sides ; face smooth, 

 lustrous yellow. Collar stiff -haired, bright yellow. Thorax violaceous- 

 black ; patagia prominently striped and metathorax transversely fringed 

 with bright yellow ; prothorax with a bright-yellow patch before and be- 

 neath the wing base. Abdomen violaceous-black, segments 2, 3, 5, and 6 

 broadly banded with bright yellow above and all segments beneath and at 

 the sides banded with pale yellow ; anal tuft narrow, rounded at tip, black 

 and yellow. Femora of forelegs pale yellow ; femora of hindlegs blackish, 

 slightly sprinkled yellow ; tibiae bright yellow, black before and at the 

 lower spurs ; first tarsal joint yellow, posterior joints black, slightly dusted 

 with yellow. Forewing nearly opaque; before and behind the large, 

 square, black, discal mark, narrow areas thinly dusted with yellow scales 

 and a heavier yellow dusting between the veins at the broad, black, outer 

 margins ; only a very thin streak between the veins before the lower wing 

 base remaining transparent ; beneath yellow, except for the discal mark, 

 costa, and outer margin. Hindwing transparent, outer margins black, 

 broader than in the male, fringes dull black. 



Expanse : Male 18 mm., female 18 to 20 mm. 



Type. — U.S.N.M. No. 56822. Holotype male, allotype female, two 

 male and three female paratypes. Collected in San Bernardino County, 

 Calif. 



Remarks. — To C. Henne, of Pasadena, Calif., is due the credit for first 

 recording the food plant and for rearing moths of this Penstemon borer. 

 It is a satisfaction to perpetuate his discovery by naming the species for 

 him. The host plant, Penstemon spectahiUs, as indicated in the name, is 

 one of the showiest of the many beautiful species included in the genus. 

 Where well colonized the plants set ablaze with rose, purple, and lilac the 

 steep slopes on hills and in canyons of the Sierras in California. This 

 borer is found in the crown roots and lower stems of the plants. The 

 larvae, although nearly full grown early in summer, do not transform to 

 pupae until late in July and in August. Hence, to assure successful breed- 

 ing, plant cuttings should not be collected until about that time. From large 

 roots several adults may emerge. The change to pupa takes place within 



