WESTERN QUARTERLY REPORTER. 175 



rufous ; head with a black band before the eyes which include 

 an undulated white line. 



This species differs much in the distribution of its colors ; it 

 is generally entirely yellowish beneath, and sometimes also on the 

 tergum; the thorax also has sometimes a yellow dorsal line, and 

 sometimes a black one. It appears in considerable numbers to- 

 wards the end of May. 



3. S. imbecilla. Body pale green ; wings white. 

 Inhabits the Ohio river. 



Body pale green, immaculate ; eyes prominent, chestnut-brown, 

 stemmata chestnut-brown, placed triangular, equidistant ; antenna 

 dusky, hairy; wing greenish white, immaculate; thorax trans- 

 versely oval, sculptured. 



Length to the tip of the wings seven-twentieths of an inch : 

 of the body about one-fifth of an inch ; of the antennas three- 

 twentieths of an inch. 



Occurs in considerable numbers on the river Ohio, about the 

 middle of May. I observed it at Cincinnati. 



4. S. biltneata. — Body pale greenish yellow ; thorax bilineate ; 

 head with a black double converging line ; eyes reddish-brown. 



Inhabits the Ohio river. 



Body pale greenish-yellow ; head a double black frontal line, 

 including the stemmata behind, converging and confluent before, 

 and truncate at the anterior stemmata; an obscure triangular 

 spot on the clypeus; eyes deep chestnut-brown; antennae dusky, 

 pale at base ; thorax with two equal, dilated, parallel, blackish 

 vittae ; scutel bimaculate, spots blackish, placed transversely ; 

 wings white, nervures blackish ; tergum black. 



Length of the body and wings, from two-fifths to one-half of 

 an inch. 



Found near Cincinnati, and occurs not unfrequently about the 

 15th of May. The obscure spot on the anterior portion of the 

 head is sometimes wanting. 



