No. 1.] ATTID.E OF CENTRAL AMERICA. 29 



HELORUS MANDIBULARIS, SP. NOV. 



Plate II, figs. 1-lc. 



S . Length, 9. Length of cephalothorax, 4 ; width of 

 cephalothorax, 8.2. 

 Legs, 1342 ; the first pair longest, stoutest and darkest 

 in color. Coxa3and trochanters visible from above. 

 Length of falces, 4. 



In this species the cephalothorax is rounder than in 

 extensus. The sides widen out plainly from above below, so 

 that the third row of eyes is considerably narrower than the 

 cephalothorax at that place. The lower outline of the sides is 

 quite evenly curved, the widest point being a little behind the 

 dorsal eyes. The cephalic part is convex, but is scarcely at all 

 inclined. The thoracic rounds off from the dorsal eyes to the 

 lower margin, not being flat, as in extensus. The c[uadrangle of 

 the ej'es is one-fourth wider than long and occupies a little more 

 than half of the cephalothorax. The anterior eyes are close 

 together in a slightly curved row; the middle are nearly twice 

 as large as the lateral, neither the lateral nor the dorsal eyes 

 being so large as in extensus. The clypeus is one-fourth as high 

 as the middle eyes. The falces are horizontal and are very 

 long and strong, with a long curved fang. On the inner edge 

 there are three small teeth near the proximal end and two 

 large ones at the extremity, while underneath there is one 

 small tooth, not very far from the end. The fang also has a 

 tooth, near its insertion. The palpus is very long and has 

 the same crook in the femur that is seen in extensus, the patella 

 and tibia, also, being at least twice as long as the tarsus. The 

 pedicle which joins the cephalothorax and abdomen is visible 

 from above. 



The falces, first legs and cephalothorax are bright reddish 

 brown. There are some white hairs on the sides of the cepha- 

 lic part and around the anterior eyes. The other legs and the 

 palpi are light yellow, the tarsal joint of the palpus having 

 some whitish hairs. The abdomen is pale brown, covered with 



