208 NATHAN BANKS. 



pale streak across thyrirliura ; a minute white dot on thyridium just before 

 the fork as usual; tip of hind wing infuscated. Basal joint of antennae about 

 twice as long as broad; wings moderately long, apex not strongly truncate, 

 anastomosis straight, vein at base of subapicals oblique, first subapical on thy- 

 ridial fully four times as long as first apii'al on discal cell ; the triangular cell in 

 hind basal part of fore wings is fully three times as long as broad (longer than 

 usual in the genus) ; subapicals in hind wings arise almost as far back as base of 

 discal cell, fourth apical cell much narrowed at base; about five or six spines 

 basad of subapical spurs on hind tibise. Expanse 28 mm. 



Tacomii, Washington, September (Morse). 



The species of the preceding genus may be arranged in groups 

 about as follows : 



1. Most of spines on tibite I yellow; the first branch of radius in hind wings is 



thickened in the middle (at least in ^ )• . -liyalinuK, indivisiis. 

 Most of tibial spines black, no such thickened vein in hind wings 2. 



2. Some dark spots along the hind edge of the radius 3. 



Without such spots uriiatus, liiteolii<<i. 



3. No oblique pale streak across the middle of thyridium <tuiiC4>l4>r. 



An oblique pale streak across middle of thyridium coiiibiiiatiis, 



radiatus, pacificii^, iiebiilosus, gravi<liis$. 



L. gravidas may, perhaps, be more properly classed as an Aiiaho- 

 lia, for in the hind wings the fourth apical is but little narrowed at 

 base, and the fore wings are scarcely truncate at apex. 



Ooiiiotaiilius coloradeiisis n. sp. — Black, anteunse and palpi black, 

 femora black, extreme tips and rest of legs pale yellowish or whitish, a black 

 spot on under side of tibise I, black spines on tibise, and two black bristles just 

 before tip of fore femora, scattered yellowish hair on the head and thorax; wings 

 pale hyaline, rather brownish along posterior margin and most of region beyond 

 anastomosis, sometimes leaving a pale streak oblique upward and a narrower 

 downward, sometimes mostly brownish, with a large pale area around anastomo- 

 sis and some elongate basal dots; pterostigma darker brown ; hind wings hyaline, 

 rather obscure at tips. Antennae much shorter than the wings, fore wings 

 moderately narrow, obliquely truncate at tip, the anastomosis zigzag. Male 

 appendages short, complicated, the superior pair short, straight, blunt-pointed. 

 Expanse 18 mm. 



Fort Collins, Colorado (Baker). 



Aiiabolia decepta n. sp. — Head brown, with black hairs, some yellow- 

 ish ones on face; antenaj brownish, basal joints rufous, with black hair; thorax 

 brown; legs yellowish ; femora brownish ; abdomen brown; wings hyaline, suf- 

 fused with light brown, a white streak from discal cell across thyridial and inter- 

 clavial areas; bases of apical cells pale; anastomosis and pterostigma dark brown, 

 and some dark brown spots along the radius and divisialis, the light brown of 

 apical part of wings irrorate with hyaline, costal area immaculate, except toward 

 pterostigma, a white dot on thyridium just before the fork. Wings rather long 

 and narrow, discal cell but little longer than its pedicel, anastomosis nearly 



