90 TERTIARY COLEOPTERA OF NORTH AMERICA. 



NOSOTETOCUS Scudder. 



This genus was established (Bull. U. S. G-eol. Survey No. 93, p. 16, 

 1892) for fossil species from Colorado. 



NoSOTETOCUS DEBILIS Sp. UOV. 

 PI. X, figs. 1, 2. 



Form very broadly oval, the length being about a third greater than 

 the width, the head not disturbing the regularity of the contour. The head 

 is rather small and transverse, with rather broadly rounded front; in one 

 specimen it is unnaturally raised so that the actual form can easily be seen. 

 The antennae are somewhat more than half as long as the breadth of the 

 broad body, and the apical joint, considerably larger than any of the others, 

 is twice as broad as the slenderer joints of the stem. The elytra show very 

 feeble indications of punctures longitudinally disposed, but not shown in 

 the plate. The under surface of the body appears to be smooth, excepting 

 the episterna, which are coarsely granulose. 



Length, 4.5 mm.; breadth, 3.25 mm.; breadth of head, 1.4 mm.; 

 length of antennae, 1.75 mm. 



Florissant, Colorado; two specimens, Nos. 9231, 11303. 



NoSOTETOCUS VESPERTINUS Sp. UOV. 

 PI. X, fig. 3. 



Form regularly obovate, about half as long again as broad. The head 

 is comparatively small, transverse, the antennae about half as long as the 

 greatest width of the body, the third and fourth joints narrowest and about 

 two-thirds the width of the apical joint, which is largest and well rounded 

 apically. The under surface of the body is exposed in the only specimen 

 discovered and is apparently smooth throughout, but where the tips of the 

 parted elytra show through the body they appear faintly and somewhat 

 imcertainly as if feebly punctured in rows. The hind femora are consider- 

 ably expanded, largest in the middle and about twice as broad as the 

 straight and equal tibiae. 



Length of body, 6.4 mm.; breadth of same, 4.1 mm.; breadth of head, 

 1.65 mm.; length of antennae, 2.2 mm. 



Florissant, Colorado; one specimen. No. 11228. 



