T. D. A. Cocker ell — Descriptions of Tertiary Insects. 227 



Art. XXY. — Descriptions of Tertiary Insects ; by T. D. 



A. COCKEKELL. 



Part II. [Continued from p. 52.] 



(3) A Belostomatid (Hemiptera) from Colorado. 



The occurrence of Belostomatid bugs in the Tertiary rocks 

 of Europe has been known ever since 1837, when Germar 

 described Belostoma goldfussi from the vicinity of Bonn, in 

 Rhenish Prussia. Belostoma speciosum. Heer, from (Eningen, 

 is one of the largest and finest fossil insects from that famous 

 locality. So far as the paleontological evidence went, one 

 might have supposed that the Belostomatids, now so character- 

 istic of America, were in Tertiary times con lined to the Old 



Fig. 1. — Zaitha vulcanica, x 2. 



World. That this was not really the case is shown by the dis- 

 covery of a small species in the Florissant Miocene. 



Zaitha vulcanica sp. nov. 



Length of body 10 mm , not counting the thick caudal valves, 

 which are about 2 mra long ; breadth in middle a little over 

 5 mm ; shape normal ; anterior femora 4: mm long, thick, but not 

 swollen in the middle, the anterior edge practically straight 

 (distinctly convex in the living Z. fuminea), the anterior side 

 with a distinct groove ; anterior tibia + tarsus about 3 mm long, 

 curved as in Z. fuminea • hind femora distinctly incrassated in 

 the middle ; hind tibia + tarsus about 6 mm , thus shorter propor- 

 tionally than in Z. fluminea. General appearance quite Nepa- 



