14 John Todd Zirnmer 



Genus Thyanta Stal 



KEY TO THE SPECIES 



I. Size medium or large (for the genus) ; second joint of the antennae 



little or not at all longer than the third 2 



I. Size small; second joint of the antennae considerably longer than the 



third 3 



2. Humeri acutely spinose perditor 



2. Humeri obtuse or acute custator 



3. Connexivum immaculate or nearly so ; no black points on the venter. 



rugulosa 



3. Connexivum distinctly maculated ; venter with a row of black points 



along the posterior margin of each segment punctiventris 



[Thyanta perditor (Fabricius). 



1794. Cimex perditor Fabricius, Eni. Syst., IV, p. 102. 



1805. Pentatoma fascifera Palisot de Beauvois, Ins., p. 150, Hem., 



pi. ID, fig. 8. 

 1837. Pentatoma collaris Westwood, Hope, Cat., I, p. 40. 

 1842. Cimex transversalis Her rich- Schaifer, Wans. Ins., VI, p. 66. 

 1842. Cimex dimidiatiis Herrich-Schaffer, Wans. Ins., VI, fig. 629. 

 185 1. Euschistus riibiginosns Dallas, List, I, p. 206. 

 1867. Euschistus fasciatus Walker, Cat. Het., II, p. 245. 

 1867. Euschistus adjunctor Walker, Cat. Het., II, p. 249. 



Recorded by Uhler (Bull. U. S. Geol. Gcog. Surv. Terr., No. 

 5, ser. 2, p. 23). No other records are at hand and there are no 

 specimens of this form present in the collection. It is a more 

 southern species which is found from Venezuela, S. A. (Uhler) 

 to Colorado (Uhler) and South Dakota (Osborn), so it may be 

 looked for here.] 



Thyanta custator (Fabricius). 



1803. Cimex custator Fabricius, Syst. Rhyng., p. 164. 

 1831. Pentatoma calceata Say, Het. Hem., N. Harm., Ind. 

 1859. Pentatoma pallido-virens Stal, Etig. resa, Ins., p. 227. 



Found commonly over the whole state. Lincoln, Weeping 

 Water, Red Cloud, Malcolm, Schuyler, Halsey, Cams, Glen, Pine 

 ridge, Sioux county, Imperial, Haigler. 



This is an extremely variable species. I have specimens inter- 

 grading from pale green through a darker shade to testaceous in 

 color, though in the case of the latter tint the integument may not 



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