378 TERTIARY INSECTS OF NUETH AMERICA. 



Table of Ihc species of Ni/siiis. 



Autennte distiuctly more than half aa loug as the body. 



Head distinctly longer thaa broad ; body relatively slender 1. N. vinctus. 



Head distinctly broader than long; body relatively stout 2. N. vecula. 



Antenna' nearly or quite half as long as the body, but not more. 

 Antenuie half as long as the body. 



Thorax tapering considerably, the apex hardly more than half as long as the base ; merabrane 



distiuctly infnmated 3. JV. Iritiis. 



Thorax tapering but little, the apex fully two-thirds as long as the base; membrano appar- 

 ently clear 4. X. ttrnr. 



Auteunie distinctly less than half as long as the body 5. A', stratus. 



1. Nysius VINCTUS. 



Body slender, three times as long as broad ; head and thorax black, 

 the abdomen blackish fuscous, antennae and legs very dark testaceous. 

 Head considerably longer than broad, well rounded, heavily punctate. 

 Antennae distinctly more than half as long as the body, the basal joint stout, 

 the remainder slender, decreasing regularly and slightly in size from the 

 second to the fourth. Thora.x rapidly tapering forward, the apical about 

 lialf the length of the basal margin, both truncate ; surface heavily punctate. 

 xVpex of corium reaching scai'cely beyond the riiiddle of the abdomen, 

 corium infuscated ; membrane clear with distinct fuscous veins. 



Length of body, d"""; antennae, 3.6°"°; breadth of thorax, 2°"". 



Florissant. One specimen, No. 7310. 



2. Nysius a'^ecula. 



PI. 2'J, Fig. 7. 



Body as compared with the preceding species relatively stout, being 

 somewhat less than three times as long- as broad ; whole body witli the legs 

 blackish fuscous, antennpe slightly paler. Head broader than long, rounded 

 subtriangular, smooth or scarcely punctate. Antennae distinctly more than 

 half as long as the bodv, the basal joint moderately stout, projecting con- 

 siderably bevond the front, the remaining joints slender, the apical barely 

 incrassated and as long as the penultimate. Thorax tapering regularly and 

 considerably, the apical considerably more than half as long as the basal 

 margin, both truncate, the oblique sides without ampliation ; the surface 

 rather delicately punctate. Hemelytra with corium infuscated, reaching 

 somewhat beyond the middle of the abdomen ; all the veins delicately 

 punctate. 



Length of body, 5.5-5.C""; antennjT?, 3.75°"°: breadth of body, 2.6 



mm 



