774 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



I/itJiopsis fimhriata. — A tolerably well-preserved specimen, with its 

 reverse (lSros.4185,4189),togetherwitli the fragment of awing (No. 143'',) 

 are the basis for this species. The vertex between the eyes is more than 

 twice the width of thie eyes, and is marked by a slight, median, longitu- 

 dinal carina; the front of the vertex is nearly straight, does not protrude 

 beyond the eyes, but is retracted next them, making it very broadly 

 convex. The thorax is considerably broader than the head, but the con- 

 dition of the specimens does not allow a more definite statement. The 

 tegmina are the best-preserved remains of the animal, being perfect, 

 although somewhat obscure, partly from the veins of the underlying 

 wings: they are more than two and a half times longer than broad, 

 the costal margin, especially its basal half, moderately curved, the com- 

 missural margin almost perfectly straight, the apex slightly and obliquely 

 truncate, so as to throw its well-rounded apex below the middle; near 

 its extremity the margino-costal field occupies more than a third 

 of the breadth of the tegmina, being double its width near the base; 

 the first branching of the inner ulnar vein is as far from the apex of the 

 tegmina as the second branching is from the base; and the third branch- 

 ing, where, and where only, the longitudinal veins are united by cross- 

 nervures, is midway between the second branching and the apex; close 

 to the apical margin there is an inconspicuous fourth series of furcations. 



Length of body 9""", of tegmina 9.75"™; breadth of the same in the 

 middle S-eS"", next the third branching of the longitudinal veins 3.25'"'". 



OETHOPTERA. 



GEYLLIDES. 



Wemohius tertiarius. — Two specimens (Nos. 18, 20) represent the hind 

 femora (and No. 18 also the hind tibia and a femur and tibia of the 

 front leg) of a small cricket. The insect must have been rather smaller 

 than our common N. vittatus (Harr.), its hind femur being 7™™ long, broad 

 and stout, especially near the base, where it measures 2.1""'; its upper 

 half is covered with exceedingly delicate, recumbent hairs, directed back- 

 ward; there are also a few hairs upon the slender hind tibia, which 

 is broken just where it begins to enlarge, showing signs of the upper 

 spines; this portion is about three-fourths the length of the femur. The 

 front femur and tibia, which are each only 2.25"" long, also indicate a 

 small species and one that is unusually free from spines, no hairs even 

 being discernible on this front leg. 



LOOUSTAEIJE. 



The only other remains of Orthoptera noticed in the Green Eiver 

 shales is a tibia and fragment of the attached femur (No. 2) of what is 

 apparently the middle legof a Locustarian about the size of a Fhyllopiera. 



