June, i9-'i] Barhkr : Rkvision of Genl's Lu.yrocoris Stai.. 113 



After careful comparison of European specimens of sylvcstris 

 and United States specimens of contractus Say. I am forced to the 

 conclusion that Uhler and Horvath were correct in following Stal in 

 the arrangement of these names. Moreover sylz'cstris is very closely 

 related to and sometimes difficult to distinjjuish from diffusus Uhl. 

 as shown hy the fact that Stal placed these together and Uhler ac- 

 cepted this arrangement. 



Specimens of sylz'cstris are generally darker colored, with the 

 head, anterior lohe of the pronotum, scutcllum and most of the 

 corium behind middle i)iceous-black ; the broad transverse fascia be- 

 hind middle, rather clean cut and strongly contrasting with the pale 

 anterior surface, extends to the costal margin. Pronotum at the 

 transverse constriction subequal to diameter of anterior margin ; 

 width across humeri usually but very little wider than anterior lobe 

 across middle. Whole anterior part, particularly the pronotum. 

 scarcely at all setose. The legs though variably colored, are more 

 inclined to have the fore femora, except apex and base, and the 

 apical part of second and third, piceous or dark brown. Membrane 

 rarely reaching the tip of abdomen, with some of the veins pale and 

 apex conspicuously marked with a triangular white spot. 



Distribution. — Over a large part of Europe and Asia, particularly 

 in the northern part. Also in the United States it is more common 

 in Canada and the northern states. Uncommon in New Jersey. 



Ligyrocoris diffusus Uhler. 



Uhler. Proc. Bost. Soc. X. H., loi, 1871 (Plociomcnis). 



Van DfZEE. Cat. 180-181, 1917 (for synonymy and literature'). 



As previously remarked this species is so closely related to syl- 

 vc\stris Linn. (= coulructiis Say) that it has led to considerable con- 

 fusion in synonymy. 



Some of the more important differences ])etwecn the two species 

 may be pointed out. In diffusus the darker color markings of the 

 corium tend toward ferrugincous. with contrasting i)ale colors less 

 striking, as anteriorly the general surface is largely .sutTuscd with 

 ferrugincous; the post-median transverse fascia is therefore less clean 

 cut and conspicuous and does not extend quite to the lateral margin. 

 The diameter of the pronotum at the transverse stricture plainly 

 wider than at anterior margin and the width across humeri quite 



