214 TERTIARY INSECTS OF NORTH AMERICA. 



9. Labiduromma sp. 



PI. 16, Fig. 24. 



A single specimen showing the terminal half of the abdomen represents 

 a species evidently distinct from the others by the form of the forceps ; but 

 as a fair view of even these is not presented no name is attached. The 

 specimen shows the side view with the ventral somites turned back so as to 

 show the body in double its width. The forceps have the aspect of those of 

 a female, and appear to be entirely simple, slender, cylindrical, tapering on 

 the basal third and beyond equal, the tip apparently a little incurved. 



Length of forceps, 2.3°"" ; width (or depth), 0.25°"". 



Florissant. One specimen, No. .5278. 



10. Labidukomma infernum. 

 PI. 16, Fig. 1 [S). 



Head roundish, of about equal length and breadth. Pronotum orbicular, 

 apparently of the same width as the head. Tegmina twice as long as broad, 

 together at least half as broad agani as the pronotum, the hind edge a little 

 rounded, surpassed only a little by the folded wings. Legs moderately 

 long, the middle and hind pairs subequal and considerably longer than the 

 front pair, the femora about twice the breadth of the tibia?. Abdomen full, 

 tapering posteriorly, the last segment a little longer than the others. For- 

 ceps as long as the last three segments of the abdomen, slender, subequal, 

 regularly arcuate, and bluntly pointed at apex (j'). The onh' specimen be- 

 ing preserved on a side view a good opportunity is not afforded to determine 

 upon the form of many of the parts. The sex is determinable by tlie num 

 ber of abdominal segments. 



Length of body, excluding forceps, 11"""; of forceps, 3°"". 



Florissant. One specimen, No. 260-4 (s)- 



11. Labiduromma labens. 



P). 16, Figs. 13, 16 ( 5 ), 9 (immature). 



Head suborbicular, of about equal length and breadth, the posterior 

 margin somewhat flattened, the mouth ^Jarts roundly and not very strongly 

 produced, the eyes very large, occupying the entire breadth of the head, 

 the margin being nearly continuous with the outer margin of the prothorax. 



