542 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



The uame I have given should perhaps be written Rolchorpa ; but I 

 have disregarded the aspirate, as Linne did in constructing Panorpa. 



Molcorpa maculosa. — A single insect (So. 63), obtaiined by Mrs. Fisher 

 from the Florissant shales of Colorado, has beautifully i^reserved wings 

 and fragments of the rest of the body. The antennce (which are not 

 fully preserved) appear to have been more than half as long ^s the 

 wings, the middle joints 0.17°^°^ long and 0.14™"^ broad. The wings are 

 less than three times as long as broad, and very regularly rounded; the 

 costal vein (especially on the front wing) is thickened and covered with 

 closely clustered, minute, spinous hairs; and similar black hairs follow 

 in a single row the base of the radial and cubital veins. The wings are 

 very dark, with large white or pale spots, of which three are most con- 

 spicuous, occurring similarly on all the wings: one, of a subquadrate or 

 subovate form, broader than long, lies scarcely beyond the middle of the 

 wing, extending from the costa to the upper branch of the cubital vein ; 

 another, nearly as large and similar in form, is subapical, extending 

 from just beyond the last fork of the upper branch of the radial vein to 

 or just beyond the upper fork of the lowest branch of the same ; a third, 

 smaller, transversely oval spot, lies next the inner border, below and a 

 little outside the first mentioned, being situated just beneath the forking 

 of the upper branch of the cubital vein ; there is also more or less iDale 

 cloudiness about the basal half of the wing, and white flecks may be 

 seen at various points near the tip, especially below the subapical spot. 

 The abdomen resembles somewhat that of the remarkable Fanorpa 

 nematogaster M'Lachl. from Java, where it is greatly elongated, and 

 possesses a curious appendage to the third joint. In the fossil species, 

 the first three joints, taken together, taper gradually and slightly, and 

 the third may have had a peculiar appendage at its tip, as the edge is 

 not entire, but appears deeply excavated in the middle, possibly due, 

 however, to its imperfect preservation ; the basal half of the fourth 

 joint partakes of the tapering of the abdomen, but its apical half is 

 swollen and its hind margin broadly rounded ; the fifth and sixth joints 

 are a little longer and much slenderer than the preceding, subequal and 

 cylindrical ; the fifth depressed on either side at the base by a pair of 

 fovese; the seventh again much smaller, linear or not half the width of 

 the sixth, increasing slightly in size apically; the eighth as large at 

 base as the seventh at tip, enlarging slightly apically, and all the joints 

 together half as long again as the wings. Most unfortunately, the 

 apical joint is lost. The specimen is evidently a male. 



Length of insect (excluding claw of abdomen) SO™"", of abdomen (ex- 

 cluding claw) 23™™, of front wing 18™™, breadth of same 5.5™™; length 

 of hind wing 16.5™™, breadth of same 5™™; length of (fore or middle) 

 tibial spurs 1™™, of one of the (hind?) tarsal joints 1.2™™. 



Indusia calculosa. — In certain parts of Auvergne, France, rocks are 

 found, which, for a thickness of sometimes two meters, are wholly made 

 up of the remains of the cases of caddis-flies. These have been frequently 



