Superfamily Argiopoidea 



the protection of the tip of the embolus. To this modified part 

 of the cymbium I have applied the name tutaculum (tu-tac'u-lum). 

 The tutaculum is most highly developed in the genus Xysticus; 

 here it is formed by an expansion of both the outer face of the 

 cymbium, which part is clothed with hairs, and of an expansion 

 of the lower edge bounding the alveolus, the two constituting 

 a groove in which the tip of the embolus rests in the unexpanded 

 condition of the bulb (Fig. 570). The tip of the edge of the inner 

 part of the tutaculum is often densely chitinized and in these 

 cases may appear in the unexpanded bulb like an apophysis of 

 the bulb. Figure 571 represents the cymbium of Xysticus gulosus 

 with the genital bulb removed so as to expose the tutaculum. 



The Thomisidae includes several well-marked subfamilies; 

 but only two of these are represented in our fauna; these can be 

 separated as follows: 



TABLE OF SUBFAMILIES OF THE THOMISID/E 



A. Tarsi of the first and second pairs of legs not scopulate 

 beneath; third and fourth pairs of legs, usually much 

 shorter than the first and second pairs; hairs of the body 

 filiform or rod-shaped and erect; upper margin of the 

 furrow of the chelicerae without teeth. P. 523. 



Misumenin^e 

 AA. Tarsi of the first and second pairs of legs scopulate beneath 

 in the females at least; third and fourth pairs of legs as long 

 as or nearly as long as the first and second pairs; hairs of 

 the body pubescent or plumose, and prone, not erect; 

 upper margin of the furrow of the chelicerae with one or 

 two teeth. P. 541. PhilodromiN/'e 



Subfamily MISUMENIN^E (Mi-su-me-ni'-nae) 



In this subfamily the tarsi of the first and second pairs of 

 legs are not furnished with scopulae in either sex, though often 

 they are thickly clothed with ordinary hairs; the third and fourth 

 pairs of legs are usually much shorter than the first and second 

 pairs; the hairs of the body are filiform or rod-shaped and erect; 

 and the upper margin of the furrow of the chelicerae is without 

 teeth. 



This subfamily includes the majority of our species of crab- 



523 



