NEUEOPTEKA— ODONATA— LIBELLULINA. 145 



Length of wing, 44™"'; breadtli, lO.-J™"'; distance from base to nodulus, 

 21.5"""; from nodulns to base of pterostigma, 13.2""'; length of ptero- 

 stigma, ;")"'"'. 



This species ditfers from JR. solida in its more pointed tip, straighter 

 form, simple subnodal sector, which is separated from the nodal by three 

 rows instead of one row of cells, and by the greater ajjproximatiori of the 

 nodnlus to the pterostigma as well as by the greater length of the latter. 



It is very closely related to ^Eschna janata Say, which Selys makes 

 the type of his Basiteschna. The nodal sector has precisely the same 

 curve just before the pterostigma, and it differs mainly in tlie more arcuate 

 tip of the principal nervule intercalated between the subnodal and median 

 sectors. 



Florissant. One specimen, Nos. 8164 and 11693. 



./"ESCHNA LARVATA. ' 

 PI. 13, Fig. 11. 



A single specimen of a larva has been found belonging to this genus 

 and not improbably belonging to one of the species descriljed : l)ut as this 

 can not from the nature of the case be detei'mined it will be best to eive it 

 a distinct name for ready reference. The front half of the body is rather 

 oljscui'e, but the outline shows the form with sufficient distinctness. The 

 body is largest in the middle of the abdomen, .scarcely decreasing in size 

 anteriorly, but posteriorly narrowing somewhat rapidly beyond tlie fourth 

 abdominal segment ; the outer edges of the posterior borders of the seg- 

 ments are not produced ; the three anal valves are distinctly seen, are very 

 slender and finely pointed : one of the legs is preserved, showing that it is 

 slender and of the usual form. 



Length of body, 34.5°""; breadth in middle of abdomen, 7.5"""; at 

 base of abdomen, 6"'"': at base of anal valves, 2.5™"'; length of latter, 

 3 25"'"'; of femur of hind ('i) leg, 6'""'; of tibia, 4.5'"'"; of tarsi, 4.25'"'". 



Florissant. One specimen. No. 1816. 



Tribe LIBELLULINA Hagen, 



A small number of species of this tribe occur in the European Ter- 

 tiaries. 



VOL XIII 10 



