Dysdera. — Harpactes. 401 



mounted by a row of teeth (4 in number), a cavity towards the apex to 

 receive the claw which is very long and strong. 



Maxillae anteriorly triangular, contracted in the middle and very much 

 dilated posteriorly where the palpi are attached; labial edge nearly 

 straight. 



Lip elongate, gradually narrowing to the apex, which is truncated 

 and grooved, the sides posteriorly slightly curved out to receive the 

 maxillae. 



Palpus with the 2nd joint much curved, the last short in the male, 

 and with the fecundating appendage oval. 



Eyes, the anterior distant, so as to give the appearance of a horseshoe, 

 and not much larger than the other pairs. 



Legs, the 4th pair longest. 



Dysdera erythrina, Auct. 

 Dysdera? parvula, Dufour. 



Div. 2. Harpactes. 



Mandibles somewhat vertical, small, elongate, abruptly truncated at 

 the apical extremity, with 2 or 3 minute teeth ; the claw very short. 



il/ax27^ffi elongate ; the sides parallel, rounded at the extremity, trun- 

 cated obliquely internally, a little dilated externally to receive the palpi. 



Lip elongate, rectangular, slightly contracted at the apex and dilated 

 at the base. 



Palpus with the 2nd joint not much curved, the last moderately long, 

 and the fecundating organ somewhat cylindric. 



from want of sufficient light and the foreshortening. If the drawing of the 

 jaws of the last species described in this paper which was taken with the parts 

 in situ, were placed side by side with the correct representation in the accom- 

 panying drawing, no one could conceive that they belonged to the same 

 species. I am inclined to think that Walckenaer's division Triangularilabrcs of 

 the genus Theridium, has been formed by a mistake of this kind, the triangular 

 anterior /«p being plainly seen and the minute fine line which marks the edge 

 of the posterior being not at all discernible, unless after dissection, in a great 

 many species. 



Vol. V. DD 



