68 TERTIARY INSECTS OF NORTH AMERICA. 



Length of body (as preserved), 11.5 mm ; of cephalothorax, 2.75 mm ; of 

 abdomen (without pedicel), 6 mm ; of pedicel, l mm ; breadth of cephalothorax, 

 3.1"""; of abdomen, 4.1 mm ; length of cheliceres, I.!!"""; of palpi beyond 

 corselet, 3.3 miu ; of first pair of legs, 8"""; its femora, 2.5 mm ; tibiae, 2.6'" m ; 

 tarsi, 2.tT'"; of second pair of legs, 9.2 mm ; its femora, 2.6'""'; tibia?, 3.25 mni ; 

 tarsi, 3.35"""; of third pair of legs, 7.5 mm ; its femora, 2.3'"" 1 ; tibiae, 2.5 miu ; 

 tarsi, 2.7"""; of fourth pair of legs, 10.75 mm ; its femora, 2. ( J mm ; tibia?, 3.2 mm ; 

 tarsi, 4.15""". 



Florissant One ~t (and reverse), Nos. 82(>9 and 8281. 



Family AGALENIDES Koch. 



This family of Tubitelarise is also fairly represented in Tertiary times, 

 three species each having been found in amber, of the genera Amaurobius 

 and Tegenaria, and one each of Agalena and Argyroneta, besides which 

 Oeningen furnishes an Argyroneta and Rott an Argyroneta and a Histo- 

 pona. To this list we can add from this country two species of Titanoeca, 

 more nearly allied apparently to the amber species of Amaurobius than to 

 any other fossils. Far the largest part of the species of this family are 

 known from Europe, but a few from America. (November, 1881.) 



Gourret has recently described a Tegenaria from Aix. 



TITANCECA Thorell. 



Two species are placed in this genus from their close general resem- 

 blance to the type of the same, Hahn's Theridium quadriguttatum of 

 Europe. The genus has never before been found fossil, but is not far 

 removed from Amaurobius, of which three species are known in the Euro- 

 pean Tertiaries. The living species of the genus are confined, so far as I 

 discover, to the Mediterranean district and central Europe, as are most of 

 the species of Amaurobius, but a few of the latter are reported from the 

 warmer parts of America. As in so many other cases, therefore, the pres- 

 ence of these species indicates a warm temperate climate. (November, 

 1881.) 



Table of the specie* of Titan<jcca. 



Cephalothorax small and oval, about half as long as the abdomen 1. T. iiigenua. 



Cephalothorax large and elongate, about three-fourths the length of the abdomen 2. T, htsterna. 



