1920] Johnson — A Revision of the Species of the Genus Loxocera 15 



A REVISION OF THE SPECIES OF THE GENUS LOXO- 

 CERA, WITH A DESCRIPTION OF A NEW 

 ALLIED GENUS AND A NEW SPECIES. 



By Charles W. Johxsox, 

 Boston Society of Natural History. 



Species based entirely on color, a character which further study 

 proves to be very inconstant, are a source of considerable trouble 

 to the student. After a great deal of collecting, and a study of 

 some 75 specimens including Loew's types, it seems apparent that 

 Say's Loxocera cylindrica represents an extremely variable species, 

 which for convenience and to more fully emphasize this variability 

 might be divided into four varieties according to the following 

 table. 



Table of Species. 



1. Wings hyaline with the tips and posterior cross veins distinctly 



clouded cylindrica Say 



a. Anterior margin of the thorax, a dorsal line, humeri, and 

 lateral lines, black var. cylindrica Say 



b. Anterior margin very broad, covering at least one-third of 

 the thorax, a dorsal line, short lateral lines and about one- 

 third of the anterior of the pleura, black 



var. pleuriiica Loew 



c. Dorsal line, humeri, lateral margins and the upper half of 

 the pleura, black var. pectoralis Loew 



d. Dorsal and lateral lines (sometimes obsolete) and a spot 

 above the yellow humeri, black var. obsoleta var. nov. 



Wings brownish, without the apical clouding 2 



2. Anterior third of the thorax black, dorsal and lateral lines want- 



ing; abdomen, except the sides of the first segment, black 



collaris Loew 



Anterior and lateral margins and a dorsal line on the thorax, 



black; abdomen except at the base red . . . fumipennis Coq. 



Loxocera cylindrica Say. 



L. cylindrica Say, Jour. Acad. Nat. Sci., Phila., Ill 98, 1823. 

 Say's description is very clear: "Thorax with an undulated 



