171 



MORMIDEA, Am. and Serv. 



17. M. lugens, Fabr. 



May to Sept. Common on muUens. 



EUCHISTUS, Dallas. 



18. E. fissilis, Uhler. 



Common from May to Oct. When pairing in May they, like 

 many other Hemiptera, are covered with a white bloom. 



19. E. servus, vSay. 



May to Oct. A more southern form quite rare here. 



20. E. tristigmus, Say. 



Abundant everywhere in trees, bi:shes and coarse weeds 

 from May to Sept. 



21. E. variolarius, Pal. Beauv. 



Occurs here from April to November, but in early summer 

 when fissilis and servus are most abundant this is rarely seen. 

 Late in autumn it frequently appears in large numbers and 

 may be found resting on the trunks of maple and elm trees on 

 our city streets, sometimes when the weather is fine, as late as 

 the last of November. I have even found it when there was 

 snow on the ground, as is the case with the squash-bug, Anasa 

 tristis. E. variolarius is a relentless foe to the Pulvinaria 

 innuftierabilis and with the Chrysopa larvae do much to keep 

 this pest of the maple in check. 



22. E. ictericus, Linn. 



June to Sept. Generally rare but taken in numbers at 

 Cheektowaga, June 26, 1893, on a low swampy meadow. 



COENUS, Dallas. 



23. C. delius, Say. 



Common in dry fields and pastures throughout the season. 

 In September last I found a dozen or more individuals gathered 

 on a bruised sweet apple, the juice of which they were eagerly 

 imbibing. 



PENTATOMA, Oliv. 



24. P, juniperina, Linn. 



Occasional on various trees and bushes especially willows 

 and junipers. May to Oct. Young in July and August. 



PERIBALUS, Muls. 



25. P. limbolarius, Stal 



July to Sept. Rather scarce. 



THYANTA, Stal. 



26. T. custator, Fabr. 



One nymph taken in April 1887 transformed to an imago on 

 May I. Very rare here. 



