OUTIIOPTKKA LOCUSTAKI.K. 221) 



slightly longer than the hind femora, and the latter scarcely extending 

 beyond the abdomen. Ovipositor long, broad, saber-shaped, a little up- 

 curved. 



This is one of the largest Tertiary Locustaria 1 known, it not the 

 largest. 



LlTIIYMXETKS GUTTATUS. 



I'!. 17, Figs. 14, 15. 

 Lithymnetc* guttatua Scmlil.. Hull. I'. S. Geol. Gcogr. Snrv. Terr., IV, 533-534 (1878). 



This is the largest insect I have seen from the Tertiary shales of Flor- 

 issant, and is remarkable for the markings of the tegmina, which are covered 

 throughout (with the possible exception of the anal area and the extreme 

 base of the wing, which are obscure) with minute, circular, equidistant, pale 

 spots, situated between the nervules ; they have a mean diameter of half a 

 millimeter, and a mean distance apart of one and a half millimeters. The 

 head is full and regularly rounded on a side view, with no prominences. 

 The antenna- appear to have -the usual structure, but the second joint is 

 small, and the thickness of the joints above the front of the prothorax is 

 0.4o nuu , already diminishing to 0.3 n ' m at the posterior border of the same ; 

 they are broken shortly beyond this point, so that their length can not be 

 determined. The mean diameter of the eyes is scarcely more than one-third 

 the shortest length of the genre. The costal margin of the tegmina is gently 

 convex, with a regular curve throughout, or until close to the tip ; the inner 

 margin has a similar though slighter convexity ; the principal branch of the 

 externomedian vein passes through the middle of the wing. The legs are 

 all slender, the hind femora very slight, but little incrassated toward the 

 base, the hind tibia- slender, equal throughout, armed at tip with a pair of 

 small, moderately stout, black-tipped spurs, the hind tarsi about two-fifths 

 the length of the tibia-, the claw very slight. Ovipositor broad, gently 

 curved, at least as long as the hind tibia-, of nearly equal size upon the part 

 preserved. 



Length of body (excluding ovipositor), 31 mm ; depth of head, rj.o"" 11 ; 

 larger diameter nf eye, l.S5 n ""; shorter, I.i55""": distance from lower edge 

 of eye to upper edire i if mandibles, 4""" ; length of preserved part of tegmina, 

 l.'i ..">""": probable length of same, aS"'" 1 ; distance from base of tegmina to 

 front of head, I .""""; from same to base of principal branch of externomedian 



