98 Proceedings of the Biological Society of Washington. 



comparative measurements are not nearly as reliable for diag- 

 nostic specific characters as they are in other groups, such as 

 Corythucha Stal. 



o 



The Genus Corythaica Stal. 



Corythaica was described by Stal in 1873 to include his Tingis monacha 

 which he had previously described in 1S60. The genus now consists of five 

 known species, one of which is herein described as new. Three of the species 

 are known to be of economic importance, feeding upon cultivated plants. 



Distributional Groupings of Species. 



The following distributional grouping of species may aid in the identi- 

 fication of species: 



Eastern United States — bellula Bueno. 

 Western United States — acuta Drake. 

 Southern United States — carinata Uhler. 

 Central America — carinata Uhler. 

 West Indies — carinata Uhler, monacha Stal. 

 South America — monacha Stal, costata Gibson. 



Food Plants op the Species. 



The only recorded food plants for any of the species may be briefly listed 

 as follows: 



Eggplant — carinata Uhler, monacha Stal. (also on wild eggplant). 

 Cotton — costata Gibson. 

 Castor Oil — monacha Stal. 



Bueno reports that he captured bellula by sweeping a grassy meadow inter- 

 mingled with moss. 



Corythaica Stal. 



1873— Stal, Enum. Hemip., iii, pp. 120, 128. 

 1897 — Champion, Biol. Centr. Am., Heter., ii, p. 9. 

 1898 — Champion, Trans. Ent. Soc. Lond., p. 58. 

 1893— Uhler, Proc. Zool. Soc. Lond., p. 716 (Typonotus). 



Comparatively narrow and elongate, especially as compared with 

 Dolichocysta Champion. Head moderately long with rostral sulcus closed 

 in front. Antennae moderately long, first segment stout and longer than 

 second, third segment very long, fourth segment about as long as first 

 two taken together and prominently swollen. Pronotum with a prominent 

 hood, usually narrow, and extending beyond apex of head. Pronotum 

 with three membranous nearly parallel carinae, and lateral membranous 

 margins flaring. Elytra areolate, with areas prominently separated by 

 sharp carinate veins. No bulbous swelling between the discoidal and sub- 

 costal areas. Species may be represented by both long- and short-winged 

 forms. 



