OF ARTS AND SCIENCES. 145 



ular not determinable. Basal scale small, triangular, equilateral, the 

 sides straight excepting the costal, which is very slightly convex and 

 prominent. 



This species differs from the preceding by its slightly smaller size, 

 squarer pronotum, and differently shaped head. 



Length of body, 5.25-7, av. 6.3 mm. ; of abdomen, 2.8-3.5, av. 

 3.2 mm. ; breadth of abdomen, 1.5 mm. ; length of wing, 7.5-8 mm. ; 

 breadth of same, 2 mm. 



Florissant. 4 specimens. No. 19 (Coll. T. L. Mead), and Nos. 31, 

 1203, 8062. 



A single specimen of a wingless white ant has been found, appar- 

 ently belonging to this species or to E. fossarum. It measures 3.75 mm. 

 in length, and is of the ordinary form of the worker, with rounded 

 head and constricted prothorax, bearing a general resemblance to 

 the only other known fossil termite larva, figured in Berendt's work, 

 but has the head more produced anteriorly and the abdomen less dis- 

 tended. 



Florissant, No. 6100. 



Illustrations of these species will appear in a Government Report 

 in preparation. 



VOL. XIX. (N. S. XI.) 10 



