— 133— 



ON THE GENUS SCHCENOBIUS. 



By PRt)K. C. H. Fkknald. 



Amherst, Mass. 



The genus Sc/i€Cfio5ius was established by Duponchel in 1844, in 

 his Catalogue Methodique, page 312, with the 'Em-openn ^i^/gan/e///is\ S. 

 v., as the t}-pe. For the purpose of re-arranging our North American 

 species, I have made a careful study oji gigatih'i/us, and would characterize 

 the genus as follows : 



Head of medium size. Eyes lart^c, globose, naked and witlioiit lashes OLelli 

 present ; proboscis short or rudimentary. Front clothed with a vvedge-sha[ied tult of 

 hairs extending; forward. Labial palpi horizontal, as long as the head and thorax ; 

 ma.xillary palpi triangular, as long as the head and re-ting on the labial palpi. An- 

 tenna; ciliated and about two-thirds as long as the eosta in the males, simple and 

 nearly half as long as the costa in the females. Thorax smooth ; abdomen ending in 

 a dense tuft in the females, simple in the males. Claspers somewhat spoon-shaped 

 and clothed with scales on both sides. The genital hook is present with an accessory 

 hook curving up and meeting it at the apex. 



Legs long and slim, with the inner spurs twice as long as the outer. 



Wings long and narrow. Foie vvings with twelve veins. Veins 5 and 6 remote 

 from each other and the cross vein between them is tine and forms a right angle 

 pointing towards the base of the wing. Veins 8 and 9, ari-e from a common stem 

 and 8 ends in or very near the apex, while 9 ends in the costa before it. Tlie other 

 veins are separate. 



The hiiid w-ings have eight veins, 3, 4 and 5 separate at their origin liut near 

 each other ; 7 and 8 from a common stem, and 6 arises near the angle of the cell. 

 The cross line makes an acute angle into the cell. Frenulum smgle in the male, di- 

 ^ide^l in the female. Median vein not pectinate above. 



The sexes differ so much in some of the species and there is so great 



variauon that the following table for separating the species is only given 



provisionally : 



Hind wings gray with a silky luster sordidellus. 



Hind wings white or nearly so 2. 



j Fore wings yellowish fuscous with a broad whitish costal stripe, .albicostellus. 

 ( Fore wings without a whitish costal sti^ipe 3- 



^ j Fore wnigs without terminal dots 4- 



■'■ J Fore wings with termuial dots 5- 



Fore wings dark fuscous with a prominent discal dot unipunctellus, {^ . 



Fore wings bright yellow, usually without a discal dot melinellus, O . 



f Fore wings pale straw yellow longirostrellus. 



I Fore wings light ocher yellow with a fuscous shade through the middle 



'] dispersellus, C . 

 (^ Fore wings fuscous 6. 



I Fore wing with three dark dots on the surface tripunctellus. 



j Fore wing with one dark discal dot • 7- 



j Terminal points present on the hind wings clemensellus. 



j Terminal points wanting on the hind wings unipunctellus, q . 



'■) 



'•] 



