HEMIPTERA— HETEROPTEKA— LYGiEID.E. 403 



equal or almost equal to tlie last two together, these subequal. Thorax 

 transverse, usually only half as broad ag-ain as long, broadest at the base 

 or slightly before the base, narrowing in front so that the head is never 

 more than half as broad as the thorax, often with a slight triangular depres- 

 sion at apex, with no distinct posterior lobe. Legs, especially the femora, 

 moderately stout. Hemelytra with the corium reaching beyond the middle 

 of the abdomen, but not far. 



Four species have been distinguished in the Florissant shales. 



Table of the species of Litliochromus. 



Thorax broadest at base ; first two joints of autenuiB together as long as the last two. 



Thorax iinpiiiictate or scarcely puuctate, longer than the wultU of the head ; cerium of hemelytra 



obscure 1. L. gardneri. 



Thorax punctate, only as long as the width of the head, corium of hemelytra clear. 



Thorax more than one-half as long again as the head 2. L. obstrictus. 



Thorax less than one-half as long again as the head 3. L. morluarius. 



Thorax broadest before the base; first two joints of antennae together slightly shorter than the last 

 two 4. X. extraneus. 



1. LiTHOCHROMUS GARDNERI. 



PL 26, Fig. 10 ; PI. 27, Fig. 8. 



Antennae as long as the head, thorax, and half of the scutellum. 

 Thorax trapezoidal, longer than the width of the head, less than half as broad 

 again as long, the sides scarcely convex, the apex nearly five-sixths the 

 length of the base, the outer anterior angles a little rounded ; the front 

 transverse or slightly emarginate ; a slight triangular depression broader 

 than long occupies the whole front margin ; surface impunctate or scarcely 

 punctate, as is also the scutellum. Corium of the hemelytra obscure dark 

 fuscous, with pallid longitudinal strigae which scarcely affect the outer apex ; 

 membrane showing faint, longitudinal, pale testaceous strigse. 



Length, 5°"° ; breadth, 2™'". 



Named for Mr. James T. Gardner," geographer of the Hayden Survey. 



Florissant. Seven specimens, Nos. 1092, 2677, 3947, 4717, i)837, 

 10076, 14204. 



2. LiTHOCHROMUS OBSTRICTUS. 



Thorax nearly twice as broad as long, only as long as the width of 

 the head, more than half as long again as the head ; the sides pretty 

 strongly oblique and slightly convex ; the apex about three-quarters the 

 length of the base ; front margin regularly, broadly, and considerably 



