NEUROPTERA— TRICHOPTERA— LEPTOCERID^. 19 1 



Length of body, 5-6.25"""; of front wing, 5.5™"; of hind wing, 4"""; 

 breadth of front wing, 1.5""°; of hind wing, 1.2"""; length of tuft of hairs, 

 0.75"". 



Florissant. Four specimens, Nos. 2142, 6964, 10702, 13137. 



Subfamily LEPTOCERID^E Stephens. 



No fossil species of this subfamily have been described, but Hagen 

 mentions several species which he refers to Mystacides and Odontocerum. 

 Two Florissant species are found, which are believed to be most nearly al- 

 lied to Setodes. The larvae of this group are found more often in running 

 than in standing water, but frequent both ; the case is usually a free sand 

 tube ; the members of the subfamily are distributed all over the world. 



SETODES Rambur. 



This genus, as existing at present, is found well represented in regions 

 as wide apart and as different as North America, Europe, and the East 

 Indies. None have before been reported fossil, and the two species we have 

 referred here are so placed more from their general aspect than for any 

 other more solid reason. The form and pointedness of the wings and the 

 general structure of the antennae, and legs look evidently in this direction. 

 The larvae of this group inhabit both standing and running waters. 



Table of the species of Setodes. 



Wings at rest extendiug far beyond the abdomen 1. S. portionalis. 



Wings at rest not reaching the tip of the abdomen 2. S. abbreviata. 



1. Setodes portionalis. 



PI. 15, Fig. 15. 



A single specimen is placed here, the pointed foi-m of the wings, the 

 size, and the whole aspect indicating this group of caddis-flies ; the wings, 

 however, are so thickly clothed with scales that no neuration can be dis- 

 tinguished. The body is tolerably slender, the antennae and legs exceedingly 

 long ; only a portion of one antenna, as long as the body, is preserved, but 

 this shows no indication whatever of diminution in size ; it is rather stout, 

 as stout, indeed, as the tarsi, and the joints four or five times as long as broad, 

 cylindrical, pale brown, with dark brown incisures ; the length of the basal 

 joints is not determinable. The legs extend a long way beyond the tip of 



