8(5 TERTIARY INSECTS OK NORTH AMERICA. 



abdomen, and the cephalic and thoracic portions completely blended ; possi- 

 bly it is slightly longer than broad. The eyes can not lie made out; the 

 terminal joint of the palpi (as preserved, sessile) is moderately large, globular 

 or slig-htlv ovate, black, but none of the internal structure can be made out. 

 Abdomen suhcpiadrate. tapering very slightly from in front backward, the 

 front straight with well rounded lateral angles, the posterior extremity well 

 rounded, the whole nearly twice as long- as broad, tiie sides nearly straight. 

 Legs closelv resembling those of I-], delita, the second pair being- unusually 

 long-, but oven more than in that >pecies exceeding proportionally the extent 

 of the fourth pair: the femora are only moderately stout, and, like the tibiae, 

 thoiig'h to a less extent, are furnished with delicate spinules, less divergent 

 but more abundant than usual, exceeding in length the width of the tibia 1 . 



Length of bodv, .'!""" ; width of cephalotliorax, 1""" ; length of abdomen, 

 _'._'")""": its width anteriorly, 1.65" 1 '"; posteriorly, \ .->"""; diameter of last 



palpal 'omt. ().;}',' : length of first pair of legs, It"""; tibi;e, !l""" ; tarsi, 



4"""; second pair of legs. S : tibi.-e. _.!' : tarsi,'3.5 mm ; third pairoflegs. 



l.s:, ; tibiae, 1.3""; tarsi, 2.1 : fourth pairoflegs. 6.5 1 -. tibia.'. '2""" ; 



tarsi, -J.o""". 



This species differs from all others of the genii- hen- de>crihcd in the 

 shape of the abdomen, which i.- elongate, and the sides of which are not 

 rounded but subparallel. In the characteristics of the legs, however, it re- 

 semble- the preceding. A single male, represented bv both obverse and 

 reverse, is belter preserved than the figure in the plate would indicate, as 

 the form of the whole abdomen can be seen as well as of the last palpal joint. 

 The figure morever indicate* the *hape of the body altogether wrongly, as 

 the cephalotliorax should lie -mailer and the abdomen should taper con- 

 siderablv behind, as the measurement* show. 



Florissant. One t, No. 8576 and 8806. 



O. ElT.IRA Vri.CANAUS. 



MII/I '. ( 'ephnlothorax nearh globular, scarcelv longer than broad, the 

 cephalic and thoracic portions -completely blended, but marked by a large 

 semicircular depression anteriorly, occupying a little more than the front, 

 i.e., encroaching upon the lateral margin, and of a darker brown than the 

 thoracic portion. Front somewhat convex, with insufficient trace of eyes. 

 Cheliceres stout, as long as the cephalic portion of the corselet, tapering, 

 bluntly rounded at the tip. Last joint of palpi very large, nearly as large 



