144 THE CANADIAN ENTOMOLOGIST. 



A NEW GASTROPACHA. 



BY J J. RIVERS, UNIVERSITY OF CALIFORNIA, BERKELEY, CAL. 



Phyllodesma Dyari, n. sp. — General appearance of the palest sienna 

 or yellowish-ochre. Thorax and patagia thickly clothed with short: hair 

 of a uniform pale tone, the abdominal covering similar, but longer and 

 finer, which gives to it a slightly silky appearance. 



$ . Anterior wings with the anal angle deeply emarginate ; three 

 lines of dusky spots cross the disc ending near the costa, these being 

 lines rather than bands. There are in some examples two dusky spots, 

 one more conspicuous than the other, in the discal space. From the 

 hind margin up to the middle line of spots, and extending to the apex of 

 the wing, the area is of a rosy .or peach-brown ; the remainder of the wing 

 being paler and colder in tone, in fact ochry-yellowish. 



Posterior wings with the usual deep emargination on the costa. From 

 just above the anal angle, a pale and rather wide band runs across 

 towards the outer margin ; this pale band widens on the inner margin 

 when in contact with the abdomen, and this part of the wing is clothed 

 with the same long filament-like hairs as the abdomen. 



Fringes of all the wings rusty and white in separate rows «of scales, 

 the basal row being rusty and running out and covering the points of the 

 nervules, while the white scales are seen only in the hollows of the 

 crenations. 



Beneath, pale rosy-brown, a darker central band traverses all the 

 wings, beginning near the costal edge of the forevvings, and finishing 

 short of the anal angle of the hind wings. There appears on some speci- 

 mens only, a short second band, when the ground colour between them is 

 whitish. In the central area bordering the emargination of the hind 

 wings is a wide patch of rusty brown. 



9 . General appearance much paler than in the other sex, being very 

 pale creamy or ochry-yellow. Margins of all the wings crenate ; 

 strongest on the hind margin of the posterior wings and decreasing in 

 boldness towards the apex of the anterior wings. There are faint lines 

 of spots on the disc of the forewings, suggestive of bands, and on the 

 hind wings the only variation of the same pale expression of the whole 

 insect is a broad, well-defined band of a lighter colour, that crosses the 

 wing from above the anal angle. 



Beneath uniformly pale ochry-brown, with a large attendant patch, 

 conspicuously darker, in the immediate region of the emargination of the 

 hinder wings. 



Expanse of wings, £ , 1.55-1.80 inches ; 5 > 2 - 2 5 inches. 

 Habitat: El Paso, Texas. 



