170 Aiiiuds Entomological Society of America [\o\. Ill, 



The suVjlegulum is a ringlikc sclerite but its form is like that 

 of a seal-ring being narrow on the mesal aspect of the bulb 

 and wide on the lateral aspect (Fig. 14, s. teg.). This wider part 

 of the subtcgulum is all of it that is commonly observed and 

 has been termed the lunate plate (Chamberlin '04). 



The specimen represented in Figure 14 was more fully 

 expanded than that used for Figure 13. In the more expanded 

 specimen there is evident a large haematodocha between the 

 subtcgulum and the tegulum; this I designate the middle 

 hcematodocha (Fig. 14. m. h.). The dark axial object seen 

 through the wall of the middle haematodocha is the fundus of 

 the receptaculum seminis (Fig. 14, /«.). 



The tegulum is also a ringlike sclerite, which is broad on the 

 lateral aspect of the bulb (Fig. l.'>, teg.), and is narrow on the 

 mesal aspect (Fig. 14, teg.). 



The median apophysis (Figs. 12 and 13, m. a.) is a conspic- 

 uous a])i)endage, which projects from the ventral side of the 

 bulb. Although the position of this appendage in Linyphia, 

 in which the middle and apical divisions of the bulb are dis- 

 tinctly separated, shows that the median apophysis is an appen- 

 dage of the middle division, in Aranea it appears to be articu- 

 lated with the base of a proximal segment of the apical division, 

 the radix. 



The conductor (Fig. 14. con.) arises at the base of the apical 

 division and is closely connected with the tegulum. 



The radix (Fig. 14, ra.) is much larger than in Linyphia. 

 Here it forms the wall of one side of the basal segment of the 

 embolic subdivision of the apical division. That this is the case 

 is more clearly shown in the bulb of Aranea circulata (Fig. IS 

 and l*.), ra.), where the segmentation of the embolic subdivision 

 is much more marked. 



The stipes (Fig. 14, .s7.) is also much larger than in Linyphia; 

 it is articulated with the distal end of the radix. Like the 

 radix, the stipes forms the walls of one side of a segment of the 

 embolic subdivision of the bulb, a fact which is also well shown 

 in the bulb of Aranea circulata (Fig. 1<S and W), st.). 



The embolus is borne by the embolic subdivision distad of 

 the stipes; it projects ventrad between the distal end of the stipes 

 which is mesad of it. and the conductor, which is laterad of it 

 in the unexpanded bulb. In the specimen represented in 

 Figure 14, the distal end of the stipes and the embolus have been 

 ])ushed away from tlic conductor in the expanding of the bulb. 



