ALLYGUS MIXTUS. 71 



The following slight sketch may be used for a 

 preliminary and superficial grouping of the species 

 comprised in the genus Deltocephalus. The remarks 

 more particularly apply to the males of the genus. 



A. Elytra wholly or very nearly concolorous, and 



without ornamentation: — J), striatus. D.abdo- 

 minalis. D. striifrons. D. citrinellus. D.Linnei. 

 D. pascueUiis. D. Falleni. 



B. Elytra with isolated spots : sometimes these are 



annular : — D. sahulicola. D. argus. D. imnc- 

 tum. D. costaUs. 



C. Elytra with fuscous -coloured areas : — D. distin- 



guendus. D. socialis. D. Flori. D. ocellaris. 

 D. ocellatus. D. repletus. D. picturatus. D. 

 pidicaris. D. coroniceps. D. Normani. 



Genus XXXIX.— ALLYGUS, Fich, 



Vertex convex, and rounded rather than acute ; with 

 the eyes as wide as the pronotum, which last part has 

 the hind border concave. Scutellum large. Abdomen 

 in the males fusiform. Elytra long, and when closed 

 overlapping at their apices, such a closure being made 

 by the folding of a moderate limbus or appendix. 

 Discoidal areas three ; apical areas five ; but the 

 elytral areas are subject to subdivision. Clypeus long 

 and narrow. Basal joint of the hind tarsus as long 

 as the second and third taken together. 



Allygus mixtus, Fab. Plate LIY., figs. 1 to 1 i. 



Cicada mixta, Fab. 



,, retictdata, Fall. 

 Jassus mixtus, Fab. ; Germ. ; Burm. ; Flor ; Marsh. ; 



Kirschb. ; Thoms. ; Ferrari, Cicad. Agri. Ligust. 



144, with figs. 



