1920] Ball: Review of the Genus Gypona 89 



the darkest males, as well as by its structural characters. 

 The writer has found this species feeding abundantly both as 

 larvae and adult on the snowberry Symphoricarpos sp., in the 

 mountain regions of Colorado. Examples are at hand from 

 New Mexico and Arizona and various places in Mexico south to 

 Vera Cruz. 



This and the preceding species need not be confused, as their 

 ranges and food plants are apparently quite distinct. Both 

 species usually carry the black spots on pronotum and hinge 

 but only verticalis shows traces of the yellow stripes and that 

 rarely. There has been much confusion and synonomy in this 

 species due to its wide variability. Stal described it twice, 

 both times from males. Spangberg described each sex as a 

 distinct species. Fowler in the Biologia described them sep- 

 arately while Gibson added to the confusion by wrongly iden- 

 tifying bimaculata and re-describing the green female as nixa- 

 biinda, listing only the dark males as verticalis. 



Gypona germari Stal is probably the light form of this 

 species. As noted below. Fowler, however, evidently figures 

 and described angulata under this name in the Biologia, 

 although the two species belong to widely different groups. 



4. Gypona unicolor Stal. 



Gypona unicolor Stal (not Gibs). 



The species here listed as unicolor is small, compact, pale 

 green without markings except for a slightly smoky shade on 

 the appendix. It is smaller and less parallel in form than 

 verticalis, from which it is also distinct by the truncate segment 

 and wide ocelli. The writer took this species in considerable 

 numbers from the clumps of dwarf oaks growing on the mesas 

 at Dolores in Southwestern Colorado and has specimens from 

 Williams, Arizona and Mexico. As noted above Gibson's 

 specimens labeled unicolor were all green forms of melanota 

 without the black spots. These could not be Stal's species by 

 either description or known range. Stal described unicolor as 

 between verticalis and germari which are probably only color 

 variations of the same species and when the types are critically 

 studied, unicolor of Stal may prove to be only the green form 

 of. verticalis. The present species, however, appears to be dis- 

 tinct in structure, food plant and habit and answers the descrip- 

 tion in every way. Fowler notes that there is a specimen from 

 Colorado in the Vienna Museum. 



