192 TERTIARY INSECTS OF NORTH AMERICA. 



the closed wings and are very slender ; the front pair, however, are much 

 shorter than the others. The front wings are very slender, densely pubes- 

 cent, when closed extending some way beyond the tip of the body, the 

 portion so extended tapering to a slender but rounded tip which is near the 

 upper margin of the wing, the costal border being almost uniformly and 

 gently convex, and not falling rapidly next the tip, while the apical margin 

 below the tip is exceedingly oblique until the tip of the body is reached. 



Length of body, 6 mm ; of front wing, 6 mm ; breadth of same, l mm ; length 

 of antennal joints, 0.5 mm ; of mid tibiae and tarsi together, 4.5 mm ; reach of 

 hind legs beyond body, 3.5 mm . 



Florissant. One specimen, No. 11754. 



2. SETODES ABBREVIATA. 



A single specimen only has been found, closely allied to the preceding 

 but with remarkably abbreviated wings. The body is moderately slender, 

 densely pubescent, the antennse black, of the length of the body, of the same 

 stoutness as in the preceding, but with joints scarcely so long and densely 

 and very finely covered with hairs. Legs not perfectly preserved but a 

 little stouter than in S. portionalis. Wings very much shorter than the body, 

 very slender lanceolate, the apical portion narrowing, more rapidly below 

 than above, to a sharply pointed tip, black, densely clothed with long hair- 

 like scales. 



Length of body, 6.5 mm ; of front wing, 3.5 mm ; breadth of wing, 0.65*. 



Florissant. One specimen, No. 5218. 



Subfamily LIMNOPHILID^E McLachlan. 



A single member of this group has been found fossil in Prussian amber, 

 a species of Halessus. Besides this, however, several larval cases have been 

 described, some at least of which appear to belong here, as it contains at the 

 present day all the larger caddis-flies which ornament their larval cases with 

 shells and other odd substances. To this list we can now add from America 

 one of each kind, a winged insect and a larval case constructed of grains of 

 stone. The group as it exists to-day is mainly confined to the northern 

 hemisphere, north of the tropics, but it reappears to some extent in corre- 

 sponding portions of the southern hemisphere, at least in America 



