ABAGHNIDES— AKANEIDES— ORBITELARI.^. 79 



it is Ji distinct, short, median furrow. The front is well rounded; nothing 

 can be said of the eyes; the last palpal joint of the male is very large and 

 globose, the basal joints evidently short. Abdomen a little larger than the 

 cephalothorax and of the same general form, but more regularly obovate. 

 Legs, especially in the male, rather short, the femora being also very stout ; 

 tibia^ and tarsi (but ncit the femora) furnished with a superior row of irreg- 

 ularly alternating-, somewhat divergent, long and slender spines on either 

 side. 



Length of body, S 7.75, 9 8.5'""'; of cephalothorax, <? 3.5, ? 4.25""'"; 

 width of same, S 3.8, ? 3.25"""; length of abdomen, S 4.25, 9 4.25""'"; width 

 of same, S 4, $3.5'"'"; diameter of last palpal joint, S 1.4"""; length of first 

 pair of legs, S 12.75-12, ? IS.S""; its tibia, / 4.2-4'"'"; tarsi, S 5.1-4.5"'"^; 

 width of femora, .T 1.2-1, 9 CS"""; second pair, .^ 11.75-10.5, 9 14.25'""'; its 

 tibia, S 4-3.25'"'"; tarsi, $ 3.75-3.75"""; third pair, S 7.76-6.5, 9 8.5"""; its 

 tibia, S 2.5-2, 9 2.5'""'; tarsi, S 2.5-2.25, 9 3.5"""; fourth pair, S 9.25-8, 9 

 12.75°'"'; its tibia, $ 3.25-2.5, 9 4"'"; tarsi, / 3-2.5, 9 4.25""'. 



The second measurements of the legs of the male are of a smaller indi- 

 vidual. It will be seen that the second pair of legs are proportionately 

 longer in the female than in the male, where they are shorter than in the 

 first pair. 



The species is represented by four individuals, one of them in dupli- 

 cate. All but one are males and, excepting one male, all are tolerably pre- 

 served. 



Named for the late Prof. Arnold Guyot, to Avhose kindness I am 

 indebted for the opportunity of studying the Princeton collection of Floris- 

 sant insects. 



Florissant. 9, No. 320; <?, Nos. 8265, 8311, and from the Princeton 

 collection, one cf, Nos. 1.808 and 1.854. 



2. Tethneus obduratus. 

 PI. 11, Fig. 31 ( 9 ). 



This species is represented by a single rather poor specimen, pretty 

 certainly affiliated with the others of this genus, but smaller than any of 

 them. The cephalothorax is of a very regular obovate form, nearly half as 

 long again as broad, with a small, circular, dark, central spot; no line of 

 demarkation of the cephalic and thoracic portions can be seen ; the front is 



