TRÄGÅRDH, SPELEORCHESTES, A SALTATORIAL TROMBIDIIDE 7 



Thus we have a median triangulär mucro, flanked by two 

 pairs of appendages. The median mucro is evidently the 

 lingua; the two appendages recall vividly the maxillary lobes 

 and maxillary plates. And since it is difficult to conceive how 

 structures so similar should have developed independently 

 in two so different groups, it seems highly probable that the 

 two appendages of Sj^eleorchestes and Alichus are really homo- 

 loguous with the maxillary lobes and plates of the Parasitidae. 

 In this respect these two genera would consequently have 

 preserved an old phylogenetic character. 



Fig. 5. Fig. 6. 



Fig. 5. S. formicorum, side view. ^^V'- 



Fig. 6. Cephalothorax and abdonien of same, ventral view. ""^7i- 



The lateral appendages (Fig. 2 inx^) are attached to the 

 outer side of the base of the median ones. Wether they are 

 articulated (as is the case with the max. lobes of the Para- 

 sitidse) or not, T have not been able to as certain; they are 

 narrow, straight and of equal width till at the top where they 

 widen slightly and are bifurcate, resembling a ehela. 



The median appendages (Fig. 2 mx^) are shorter and to 

 all appearance biarticulated. The basal joint is broad and coni- 

 cal, with convex sides; the terminal joint is narrow, cylindri- 



