452 



NORTH AMERICAN INDEX FOSSILS. 



few ; anal area generally well defined by anal furrow, and with few 

 veins; C marginal, Sc nearly reaching to apex of wing; R simple, 

 Rs originating near the base and dividing into several branches ; 

 M generally forking several times ; Cu with simple fork only ; legs 

 similar; 1,400 Recent and about 100 Tertiary species are known, 

 of which 24 occur at Florissant (Setodes abbreviata Scudder, 

 Hydropsyche marcens Scudder, Mesobrochus, 2 species, Dero- 

 brochus, 7 species, Neuronia evanescens Scudder, Phryganea labe- 

 facta Scudder, Limnophilus soporatus Scudder, and others) ; from 

 the Green River beds of Wyoming, masses of tubes composed of 

 rock fragments and known as Indusia calculosa Scudder, have 

 been obtained ; they are believed to belong to Phryganoid larvae. 



Order LEPIDOPTERA Linn. 

 (Butterflies and moths.) 

 With similar fore and hind wings, covered with scales and usually 

 highly colored ; with suctorial mouth parts, in the form of a spirally 



Fig. 1753. Jupiteria charon, 

 individual with overlapping wings. 

 Scudder.) 



entire Fig. 1754. Jupiteria charon, showing 

 (After venation and margins of separated wings, 

 Xf (After Scudder.) 



coiled proboscis. C marginal ; Sc and R simple ; Rs generally with 

 4 branches in front wings, and less in the hind wings ; M divided 

 into three, more rarely into two branches, or unbranched ; Cu gen- 

 erally simple, anal veins i or 2. About 60,000 Recent species ; the 

 number of Tertiary species is just over 75. Fossil Lepidoptera are 

 known from the Jurassic on, but in America the order is only repre- 



