HEMIPTERA— PHYTOOOPJDAE— MIEIS INSTABIL1S. 837 



rostrum reaching to behind the intermediate coxae. Pronotum convex 

 behind, the surface finely, deeply, and partly confluently punctured ; the 

 lateral margins broadly sinuated and with the carinate edge sharply promi- 

 nent ; the lateral black vittae of the head are continued to each side of 

 the scutellum, and sometimes extend broadened along the hemelytra to 

 the apex of the corium ; anterior angles callous exteriorly ; the lateral carina 

 abbreviated before reaching to them; humeral angles slightly recurved 

 behind ; the median line distinct and paler ; propleura coarsely, confluently 

 punctured, crossed longitudinally by a slender brown or red line, which is 

 continued interruptedly to near the apex of the venter ; meso- and rneta- 

 pleura punctured on the disk. Hemelytra pale straw-yellow on the exterior 

 margin, and also on the edge of the inner margin, minutely, closely punc- 

 tured, pubescent ; cuneus generally pale green ; membrane hyaline, or 

 tinged with brown, with the nervures rufous or pale brown, sometimes with 

 a fuscous short streak extending beyond the nervure. Wings hyaline or 

 faintly smoky and iridescent, with the- nervures brown. Scutellum with 

 finer punctures than the pronotum, those of the middle and base being 

 sometimes fuscous ; the median line pale and smooth. Tergum green or 

 pale rufous ; the disk more or less fuscous. Venter green or pale rufo-testa- 

 ceous, invested with rather close, yellow, sericeous pubescence, usually with 

 a slender vitta of interrupted red or fuscous lines against the impression 

 bounding the connexivum. Legs green, pubescent, often having the tarsi 

 and tibise rufous ; the posterior femora usually with two rows of rufous or 

 piceous dots on the upper surface, and two similar rows beneath ; the nails 

 and tip of joint next to them piceous. 



Length, 6-7i millimeters ; width across the; humeri, lf-2 millimeters. 



Collected at Roaring Fork, Colorado, by Dr. J. T. Rothrock. 



I had formerly accepted the determination of Dr. Harris in referring 

 this species to Miris dorsalis, Say ; but after having closely compared speci- 

 mens from many parts of North America with his description, the discrep- 

 ancies are too great to permit such a reference. 



This species inhabits a large part of North America, and it may yet 

 prove to be only the western form of the European M. laevigatas, Linn. 



