BUFFALO SOCIETY OF NATURAI, SCIFNCFS 485 



infnscated. Elytra frequently, and sometimes the scutellum, more or less 

 infuseated, at times almost black in the males. In the dark specimens the 

 euneus is mostly pale. Membrane a little infuseated ; usually the apex 

 or a marginal spot about half way beyond the apex of the euneus is darker, 

 in typical examples there is a fuscous cloud along each side of the body 

 beneath which reaches the margin on the abdomen and shades lighter 

 towards the middle of venter. Stigmata, pale. In dark males the abdomen 

 may be entirely blackish-fuscous becoming a little paler along the middle 

 of the venter. 



Described from numerous examples of both sexes taken in 

 New York, Massachusetts and Maine. It is a common species 

 throughout the eastern United States and Canada. Many years 

 ago Dr. Uhler determined this species for me as Lygns tenellus 

 and Prof. Osborn and Mr. Heidemann have it under the name 

 Lygus hirticulus Uhler, MS., but a description of it has never 

 been published under either of these names. 



This belongs to a perplexing group of species including 

 invitus Say, belfragei Reut. and fasciatus Reuter. The females 

 are sometimes difficult to distinguish, but their males can 

 readily be separated by the form of the genital pieces. In 

 invitus the ventral base of the genital segment is long, sinuated 

 on the side and strongly produced to a subacute point at the 

 middle; in tenellus it is shorter and rounded at apex and 

 deeply notched at the side ; in belfragei it is still shorter and 

 more rounded with the lateral notch more rounded while in 

 fasciatus this segment is almost truncated with a broadly 

 rounded median lobe. In tenellus the style lying in the sinistral 

 notch of this segment is produced in two parallel subacute 

 equal teeth separated by a narrow deep notch similar in form 

 to one of the teeth ; in invitus it is produced in one moderately 

 long obtusely conical tooth, from the inner base of which pro- 

 jects an acute incurved tooth forming nearly a right angle with 

 the primary tooth; in belfragei this primary or outer tooth is 

 longer and more slender, linear, obtuse at apex and forms an 

 angle of about 135 degrees with the acute incurved inner tooth ; 

 in fasciatus this primary tooth is still longer and curved some- 

 what outward so it is parallel with the outer margin of the seg- 

 ment, and the long incurved inner tooth is extended in almost 

 a straight line from the primary tooth, forming an angle of 

 at least 165 degrees. 



The antennse usually present recognizable characters 

 between these species but in immature specimens they are not 



