16 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



spines, those at the meson bemg nearest the anterior margin; these 

 spines increase in size upon each succeeding segment caudally. The 

 ninth segment bears two rows of spines, one transverse row of six 

 long spines across the center of the dorsum; the second row at the 

 tip of the segment consist of six long spines. Midway between these 

 two rows on each side stands two spines similar in size to those com- 

 posing the rows. Tip of tenth segment bears six long slender spines, 

 and the pseudo or eleventh segment bears two small spines. All 

 abdominal spines are sharp pointed and are much hghter in color 

 than the abdomen. 



Male. — Similar to the female, except smaller and more slender and 

 lighter in color. The abdomen narrower and more nearly cylindrical. 

 Segments two to eight of the abdomen ventrally are thickly peppered 

 with small circular transparent spots. The ninth segment is only 

 slightly narrowed caudally. The tenth segment is cylindrical and 

 about half retracted within the ninth. Relative lengths of segments 

 of antennae taken from measurements upon the same scale as with the 

 female : 



1 _2_ _3_ ^ _5_ _6_ _7_ 8 

 5 871 12.5 9.7 11.5 14.7 3.9 6 



Described from many females. Type slide contains three females 

 collected from Indian Poke, Quincy, Florida, May 18, 1910, by G. A. 

 Runner and A. C. Morgan. Other specimens of females collected 

 from Magnolia grandiflorum, Quincy, Florida, September 8 and 9, 



1909, by A. C. Morgan, and from "Coffee bean" September 7, 1909, 

 Quincy, Florida, by the writer. 



Two males from " Touch-me-not," Clarksville, Tennessee, August 1 1 , 



1910, by S. E. Crumb. One of these is designated as the Allotype. 

 One male in sweepings from grass Wittenberg, ^Missouri, July 12, 

 1909, by A. G. Vestal. This paratype is in the collection of Mr. J. D. 

 Hood, from whom it was received for comparison. 



One slide in the collection of the United States Department cf 

 Agriculture contains about 20 females, one male, and several larvse. 

 These were collected in the District of Columbia, August 14, 1900, 

 from Adicea. Department note No. 9305. 



This species may be distinguished from its congener E. mexicanus 

 Moulton, by the following differences : Basal fifth of wing gray and a 

 grayish band across the middle; the greater number of spines on the 

 costa and the fore vein; and by the greater relative difference in the 

 lengths of the first and second antennal segments. In mexicanus the 

 second segment is more than three times as long as the first, while in 

 americanus the second segment is only about twice as long as the 

 first. 



r?/pe.— Cat. No. 15726, U.S.N.M. 



