110 



Journal Xew York Entomological Society. H'o'- -^iX- 



as tliat autlTor mentions in his description one of its most prominent 

 and constant characters, viz., the black lateral edge of the pronotum 

 and the purple-red pronotal band as well as a few minor character- 

 istics. Moreover, Herrick-Schaeffer's description and figure of T. 

 custator Fabr. pertains without doubt to T. calccata Say, so it should 

 be placed as a synonym of that species and the arrangement should 

 be as follows : 



Thyanta custator Fabr., Syst. Rhyng., 164, 1803. 



Thyanta calccata Say, Hem. Xew Flarm. Ind., 765, 183 1. Syn. 



Thyanta custator Fabr. Pferrick-Schacffer, W'anz. Ins., VII, 96, 



106, fig. 771, 1844. 



Thyanta calccata Say is imiformly smaller and proportionately 

 shorter than T. custator, subshining and uniformly dark green in all 

 of the mature specimens I have seen. The lateral edge of the pro- 

 thorax is always narrowly black and with an almost constant, con- 

 spicuous, purple-red band between the humeral angles on the dorsal 

 surface of the pronotum. The scutellum, as shown in Fig. I, is 

 relatively shorter in this species and the narrow apical portion not 

 so attenuated as in T. custator and concolorous. The lateral margins 

 of head, pronotum, abdomen and the legs less setose. The second 

 and third joints of the antennce subequal in length, with the first 

 two' joints pale green, third and base of fourth segment rufous and 

 the apex of fourth and fifth infuscated. The two black points are 

 more or less evident in the cicatrix of the pronotum. The mem- 

 brane is frequently without fuscous spots, similarly to T. custator. 



ea./cea.^a. <S Cl/sta.'toT S 



Fig. 2. Posterior segments of male Thyanta calccata and Tli. custator. 



The genital segment of the male, as shown in Fig. 2, is propor- 

 tionately narrower, more convex ventrally and with the two lateral 

 lobes not so divergent internally, apically more rounded and with 



