74 TERTIAEY INSECTS OF NORTH AMERICA. 



Length of body, 11""; of cephalothor.ix, 5"™ ; breadth of same, 2.2"""; 

 of abdomen, 6.4"'" ; length of first pair of femora, 6"" ; second pair, .5""" ; 

 second tibise, 4"""; third fentora, 2""; third tibite, 2.4""; fourth femora, 

 3.25™". 



Besides its very much greater size, this species differs greatly from the 

 other in the form of the cephalothorax. 



Florissant. One ?, No. 13521, preserved on a dorsal view. 



2. Theridium seclusum. 



PI. 11, Fig. 20 ( ^ ). 



Male. — Cephalothorax stout, square oval, a little longer only than 

 broad, the front broadly and regularly rounded. Cheliceres ratlier stout, as 

 long as half the width of the corselet, tapering a little, rounded at the apex, 

 the outer edge straight, the inner rounded. Last joint of palpi nearly as 

 large as tlie cheliceres, oval, on a stalk as long as the cephalothorax. These 

 two parts are incorrectly represented on the plate, where the palpi and cheli- 

 ceres appear as one great piece. Abdomen rather small, oval, narrower 

 than the cephalothorax, but of about the same length. Legs long- and 

 slender, the first pair particularly long, and the second pair considerably 

 longer than the fourth, which is unusually slender ; all the legs are furnished 

 witli numerous spines, apparently arranged in three rows and clustered much 

 more numerously at the distal end of the femora and tibial than elsewhere ; 

 the spines are moderately slender and about as long as the width of the 

 joints, separated from one another by about their own length, sometimes a 

 little less. 



Length of body, 4.5"'" ; of abdomen, 2.25"™ ; width of cephalothorax, 

 1.65"™; of abdomen, 1.2""; length of cheliceres, 0.75""; of first pair of 

 legs, 15""; its femora, 4.5'""; tibire, 4.5""; tarsi, 6""; second pair of legs, 

 12™" ; femora, 3.75'"" ; tibiw, 3.75™™ ; tarsi, 4.5"" ; third pair of legs, 5.25"" ; 

 femora, 1.4™"; tibia?, 1.1"" ; tarsi, 2.75"" ; fourth pair of legs, 9""; femora, 

 3.5""(?); tibire, 1.5'"" (?) ; tarsi, 4™". 



Tlie species is very much smaller than T. opertaneum, besides having 

 a very diflPerent corselet. 



Florissant. Nos. 2286, 7816, 9026. All the specimens appear to be 

 males. 



