HEMIPTERA— HETEROPTEEA-COKIXID^. 345 



in the form of the costal field. I have seen but few of our many species of 

 this genus, but Mr. Uhler, who has seen only the figure of the present spe- 

 cies, informs me that it shows most resemblance in markings to C. prseusta 

 Fieb. of Europe. The thorax is dark and more or less mottled with pale, a 

 mottling which appears to have a transverse disposition, but the condition 

 of none of the specimens allows one to say whether it is as regularly dis- 

 posed as on the hemelytra or not. On these the costal field is pallid with a 

 dusky vein extending down the middle, and is very broad just beyond the 

 base, being in the middle of the basal half equal to one-third the entire 

 breadth of the hemelytra; beyond it narrows, and opposite the obhque 

 termination of the corium is lightly marked with the faintly and delicately 

 undulate narrow, dark, bands of the rest of the hemelytra ; these are some- 

 what broader than the intervening pallid spaces, and traverse the corium 

 and clavus alike with more or less but ordinarily not much interruption at 

 the suture ; on the membrane these darker bands become shattered as if by 

 a jar which has almost but not quite destroyed at once their transverse and 

 their linear character. 



Length of body, 7.5""° ; of tegmina, G™" ; breadth of closed tegmina, 



Named for Mr. E. P. Van Duzee, of Buffalo, a careful student of our 

 native Hemiptera, whose assistance has been of great service in the study 

 of the fossil forms. 



Florissant. Five specimens, Nos. 3219, 3409, 3GG5, 5178, 7269. 



2. CORIXA IMMERSA. 



PI. 22, Fig. 16. 



A robust form with more obscure markings than the preceding but 

 very similar in character. The head and thorax are dark and uniform, 

 and the hemelytra may best be described as dark, traversed more or less 

 distinctly, more distinctly distally than next the base, with pale, tremulous, 

 continuous threads, which cross corium and clavus alike but are stopped by 

 the costal field, which is slender and nearly equal throughout ; on the mem- 

 brane the markings are shattered and present precisely the appearance they 

 do in C. vanduzeei ; the markings bear much resemblance to those of C. 

 hellensii Sahib, of Europe, as figured by Snellen. 



