HEMIPTEKA— HETERUPTEEA— rBNTATOMIDzE. 447 



Tliis is the commonest fossil cydnid known in tlie " Amyzon shales." 



Length, 4.25-5.1'"'"; breadth, 2.2-3.1°"". 



Florissant. Twenty-nine specimens, of which bome of the best are 

 Nos. 1919, 2100, 4565. 46G3. 4851, 7543, 9583, 11226, 12068, 12987, 14221, 

 14224. 



6. Neceocydnus senior. 



Head well rounded, transversely ovate, nearly a third as broad as the 

 thorax, half as broad ag^ain as long. Thorax only twice as broad as the 

 median length, tapering l)ut little, the lateral angles of the front prominent, 

 the apical eniargination considerably and tolerably deep, the surface appar- 

 ently finely punctate, with two posteriorly converging shallow and faint 

 sulcations crossing the disk longitudinally from the outer edges of the eyes 

 backward. Scutellum moderate, more than half as broad as the thorax, 

 broader than long, reaching less than half-way to the tip of the abdomen. 

 Hemelytra with the corium punctate in serial rows, reaching the middle of 

 the antepenultimate segment of the abdomen. Tibias heavily spined. Ab- 

 domen full and rounded, hardly so long as broad. Color blackish brown, 

 the hemelytra with the corium dark testaceous, the membrane clear. 



Length, 4""" ; breadth, 2.5'°'". 



Florissant. Four specimens, Nos. 2732, 11566, 11793, 13155. 



7. Necrocydnus solidatus. 



PI. 28, Pig. 13. 



A stout species, fuller in front than behind. Head transversely ovate, 

 about twice as broad as long and about one-third as broad as the thorax. 

 Thoi'ax hardly twice as broad as the median length, tapering but very little, 

 the lateral angles of front ver}' prominent, tlie apical emai-gi nation very broad 

 and only moderately deep ; surface even and distantly punctate. Scutellum 

 similarly punctate, about two-thirds as broad as the thorax, broader than 

 long, the angular apex not reaching half-way to the tip of the abdomen. 

 Hemelytra with the corium apparently reaching the penultimate abdominal 

 segment. Tibipe very heavily and coarsely spined. Abdomen subconical, 

 pointed. 



Length, 5.6""" ; breadth, 3""". 



Florissant. Two specimens, Nos. 6967, 8840. 



