82 TERTIARY INSECTS OF NORTH AMERICA. 



l).-yond front, 2.2"""; length of first pair of legs, 9,25 mm ; its tibia, 3.25 mm ; 

 tarsi, 2.4""" ; second pair of legs, X""" ; its tibia, 2.75 mm ; tarsi, 2.4 mm ; third 

 pair of legs, 5.:)"""; fourth pair of legs, 7"""; its tibia, 2.3 mra ; tarsi, 2.3 mm . 

 The measurements are all taken from the female. 



This species is of about the same size as the last, but differs from it in 

 its slenderer form, the shape of the cephalothorax, slightly slenderer and 

 le>> tapering legs, as well as in the clothing of the same. 



Florissant, One ', three , N..s. 8141, 13519 and l:!522, 13524 (2), 

 14SI91 i 



EPE11JA \Valckenaer. 



Only a very few species have been described in a fossil state under this 

 generic name. Heyden figured a Gea krant/.ii from the Miocene beds of 

 Rott on the Rhine \vhich Thorell considers an Kpeira and which is about 

 the si/.e of \']. delita, but which does not resemble anv of our species. Heer 

 figures an Epeira molassica from Oeningen, considerably larger than any 

 of the Florissant Kpeir;e, but perhaps more nearlv resembling E. delita 

 than any of the others. Menge names but does not describe an K. eogena 

 from amber, three millimeters long, or of about the size of our smallest spe- 

 cies; and linallv Uertkau has more recently described and figured a second 

 species from Holt, under the name of ]]. troschelii, which hears no small 

 resemblance to our K. meekii, with which also it agrees very well in size. 



Seven species are here described and others indicated, this genus being 

 the only one represented on both continents in Tertiary times which is 

 richer in species in America. The genus is found in all parts of the world, 

 and its occurrence in such numbers in the Florissant beds is a point of no 

 significance beyond the comparison just made with the European Tertiaries. 

 (October, 1X81.) 



Table of the species of Epeiru. 



Cephalic distinctly separated from the thoracic part of the cephalothorax. 



Large species; front of cephalothorax excised in the male 1. E. meekii. 



Small species; front of cephalothorax regularly convex in the male 2. K. abscondila. 



Cephalic and thoracic portions of the cephalothorax completely blendrd. 

 Alidoinni narrowed in front and hehind. 



A lido i in- 11 di.stiiict.ly ovate 3. E. delila. 



Front of abdomen quadrate, as broad as in the middle 4. E. cinefacta. 



Abdomen nearly globular. 



Larger species ; abdomen smaller than cephalothorax 5. E. vucanalis. 



Smaller species ; abdomen larger than cephalothorax 6. E. emertoni. 



