Eighteenth Report State Entomologist of Minnesota — 1920 



SPECIES WHICH HAVE BEEN DESCRIBED OR PLACED IN 

 THE GENUS DERAEOCORIS BUT BELONG 



TO othi<:r genera 



Lygus robustus (Uhler) 



1895 Caiiipfobrocliis rohusttis Uhler, Hcmip. Colo., p. 39. 



1917 J.yi/us robustus Knight, Bui. 391, N. Y. (Cornell) Agr. Exp. Sta., p. 588. 



1917 Campfobruchys robiisfns Van Duzee, Cat. Hemip., p. 354. 



The writer (1917) placed thi.s species as a Lygus and in the 

 pratensis group. Among the material received for study from the 

 National Museum, the writer has foiuid one of the type specimens, 

 labeled in Uhler's handwriting. It agrees in all respects with the 

 original description and opportimity is here taken to designate it as 

 the type. Robustus is most closely related to Lygus Iiunieralis Knight, 

 but is slightly larger and the anterior angles of the pronotum are less 

 prominent. 



To Uhler's description the writer desires to add the following 

 observations on the type : 



Length 6.3 mm. Head: width 1.26 mm., verte.x .48 mm., length .63 mm., 

 height at base .74 mm. ; vertex nearly flat, carina prominent but apparently 

 formed by the perpendicular front margin of the collum ; front marked with 

 six or .seven oblique or nearly transverse, subcutaneous brownish black lines each 

 side of the median line; rostrum (apex covered with glue) apparently reaching 

 upon the hind coxae. 



Pronotum: length 1.42 mm., width at base 2.45 mm., anterior angles 1.11 

 mm. : calli very slightly convex, basal margins distinctly impressed beneath 

 the level of the pronotal disk, brownish black, more nearly black along the 

 basal and outer margins ; two brownish black stripes extending from basal 

 margin of each callus to near middle of disk, median line paler than the general 

 coloration of disk. 



Hcinrlytra : width 3.1 mm.; apex of mar- 

 ginal vein blackisli, or "with black arrest at 

 tlie end of the costal area" in the words of 

 Uhler ; lateral margin of corium pale trans- 

 lucent, the translucent area extending across 

 base of cuneal fracture and around basal 

 angle of cuneus to membrane; cuneus dark 

 brown but distinctly paler along outer mar- 

 gin ; membrane clear, or only slightly invaded 

 with brownish from the veins, a dark mark 

 ])aralleling the brachium at apex of larger 

 areole similar to that found in huinrralis. 



I' enter: olivaceo-testaceous, brownisli black 

 along basal margin of each segment but nearly 

 196 



roDu3/U6 Ukl. 



Pig. 44. L y g u s robust its, 

 male g-enital claspers. 



