HEMIPTERA— IIETEROPTERA— LYG^[D^. 377 



Length of body, 8.5-9"""; antennae, 3.5"'"'; breadth of thorax, 3""" 

 Florissant. Three specimens, Nos. 11020 and 11235, 11219, and of 

 the Princeton Collection, Nos. 1.811 and 1.821. 



2. Lyg^us obsolescens. 



PI. 24, Fig. 15. 



Head strongly but roundly produced in front of the large eyes ; the 

 surface smooth, uniform ; antenna longer than in the other species, uni- 

 formly fuscous. Thorax with nearly straight sides, the anterior outer 

 angles rounded, the front margin regularly, roundly, though not consider- 

 ably, niarginate ; surface uniformly, very sparsely and coarsely jjunctate, 

 the scutellum similar. Color of whole body uniform or nearly so, but with 

 faint signs tliat the disk of the thorax was lighter than the rest and that a 

 lighter but obscure and narrow band crossed the closed hemelytra and 

 scutellum at the apex of the latter. 



Length of body, 10'""'; antennae, 4.5'""'; breadth of thorax, 3.5'°°'. 



Florissant. Three specimens, Nos. 421, 10454, 11218. 



3. Lyg^us f^culentus. 



Head but little and roundly produced in front of the eyes, the surface 

 smooth, more or less mottled, the antennae fuscous, the second joint much 

 darker than the succeeding. Thorax with scarcely ampliated, oblique lat- 

 eral margins, the front margin gently and roundly emarginate, the wliole 

 surface smooth, fusco-fuliginous, with a pair of oblique and divergent 

 ])aler lateral clouds ; scutellum smooth, the disk and base fusco-fuliginous, 

 the rest obscure pallid. Hemelytra fuliginous with no transverse {)allid 

 band, but with a narrow, pallid stripe following the sutura clavi. 



Length of body, 9.75"'°'; antennae, 3.75"'™; breadth of thorax, 3 1""". 



Florissant. One specimen, No. 1.835, of the Princeton Collection. 



NYSIUS Dallas. 



No fossil Heteroptera have been before referred to this genus, which 

 is found all over the world, from Greenland to the Cape of Good Hope, in 

 the East Indian and Pacific Islands, and in North and South America 

 Five species occurring in the Florissant shales belong here or in the near 

 vicinit}', and may be separated by the following table : 



