428 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



2. A. rectus. 



Aradus rectus Say, Heteropt. New Harmony, 29, No. 4. 



One specimen from the mountains near Beaver Brook Gulch, August 6. 



The most diligent search beneath loose bark and in the crevices of the 

 bark of the pines and other trees, at lower levels, failed to detect other 

 specimens. These two species evidently belong more particularly to the 

 high mountains, and to the northern regions where the air is of corre- 

 sponding rareness. 



Family PHYMATID^. 



Phymata Lat. 

 P. erosa. 



Cimex erosus Liuu., Syst. Nat., ed. 12, ii, 718, No. 19. 

 Phymata erosa Amyot et Serv., Hemipt., 290, No. 2. 



This species is now widely distributed over Western as well as East- 

 ern North America. I did not meet wath it in the mountains, but it was 

 sufficiently common around the foot-hills and on the plains wherever 

 man had settled and cultivated the ground. It was generally found 

 prowling about upon the stems and flowers of the Euphorbias and Sun- 

 flowers, trying to catch the bees and other insects which alighted there. 



Family NABID^. 



CORISCUS Schrank. 

 C. ferus. * 



Cimex ferus Linn., Fauna Suec, 256, No. 962. 

 NaMs ferus Fieber, Europ. Hemipt., 161, No. 9. 



Widely distributed in Colorado, as well in the mountains as on the 

 plains and foot-hills ; chiefly, however, in spots where the agency of man 

 is to be seen. Foreign w eeds have been introduced, and various plan ts have 

 been encouraged by the wider distribution of seeds near the streams of 

 water and on the routes of travel, and on these this species finds its 

 home and food. In damp situations in Beaver Brook Gulch, in Clear 

 Creek Caiion, everywhere in Denver City and around it at the lower 

 levels, in the region of Colorado Springs and Manitou, near Caiion City, 

 and in the valley of the Arkansas, it is quite common in August. 



Dr. Packard collected it on June 27 at Denver, and at Salt Lake 

 City in July. Slight differences in the amount of black and pattern of 

 marking of the head and pronotum occur in the specimens from Colo- 

 rado, just as in those from England and the continent of Europe. There 

 is also some variation in the size and proportion of the various parts of 

 the body, particularly in the width of the abdomen. 



