1910] The Palpi of Male Spiders 177 



The distal hcematodocha . — The most striking feature of the 

 embolic subdivision in the aranea-type is the presence of a 

 large hfematodocha, which when expanded over-shadows all 

 other parts. This haematodocha I designate the distal hcema- 

 todocha (Fig. 13 and 14, d. h.). It is doubtless due to the devel- 

 opment of this haematodocha that the radix and the stipes are 

 restricted to one face of their respective segments of the apical 

 division in Aranea frondosa, the remaining parts of the wall 

 of these segments forming a part of the distal haematodocha. 



The mesal siibterminal apophysis. — On the mesal aspect of 

 the bulb, there arises from the distal haematodocha a prominent 

 apophysis (Fig. 14, m. st. a.) ; this may be termed the mesal sub- 

 terminal apophysis. 



The lateral siibterminal apophysis. — On the lateral aspect 

 there is also an apophysis borne by the distal h^matodocha 

 (Fig. l.'i. /. St. a.); this may be termed the lateral subterminal 

 apophysis. 



The terminal apophysis. — In Aranea frondosa, the tip of the 

 embolic subdivision of the bulb ends in a spearshaped apophysis 

 (Fig. 13, /'. a.); this may be termed the terminal apophysis. 



The Palpus of Aranea Ocellata. — A glance at the palpus 

 of Aranea ocellata {Epeira patigiata) will show that it is of essen- 

 tially the same type as that of Aranea frondosa but is different 

 in some details. It is figured here to illustrate the kind of 

 variations in form that serve to distinguish closely allied 

 species (Fig. 15.) The median apophysis differs markedly in 

 form from that of A. frondosa; the tegulum bears a small but 

 distinct apophysis; the lateral subterminal apophysis bears two 

 prominent teeth; and the terminal apophysis is lacking, the 

 embolic subdivision ending in a blunt lobe. 



The Palpus of Aranea Circulata. — The most striking 

 modification of the aranea type of palpus, taking the palpus of 

 Aranea frondosa as typical, is that of Aranea circtdata, which 

 is the most complex palpus that I have studied. " In the unex- 

 panded bulb, there appears to be no resemblance to the bulb of 

 Aranea frondosa. In Aranea circulata (Fig. 16 and 17), the bulb 

 is very large and the cymbium comparatively small and narrow 

 (Fig. 17, cym.). The basal haematodocha (Fig. IG, b. h.) is 

 conspicuous, which is the result of the other parts of the bulb 

 being twisted into unusual positions. The median apophysis 

 is large and projects beyond the tip of the bulb (Fig. 16, m. a.). 



