OKTIIOPTEKA ACRIDI1. 221 



TYRBULA gen. nov. (rvpfiq). 



This name is proposed for a group of Truxalida- evidently falling in 

 close proximity to Syrbnla Stal, having linear antenna?, enlarged apically, 

 and hind tibia- well provided with spines. The antennae are more distinctly 

 dubbed than in Syrbula, the clui) being about twice the diameter of the 

 stalk, composed of seven or eight, joints of which the last two are verv small, 

 forming a rapidly tapering tip. The head i.s less prominent than in Syrbiila 

 and the eyes considerably smaller, being considerably shorter than the in- 

 fra ocular parts of the cheeks ; otherwise the general aspect of the insect is the 

 same. The genicular lobes are as in Syrbula. The hind tibiae are abun- 

 dantly spined, in one species even much more abundantly than in Syrbula. 



Table of the apecics of Ti/rbula. 



spines of him! tibiic exceedingly numerous, their basal half hardly tapering 1. T. muttispinota. 



Spini-.s of hind tibiio less numerous, tapering uniformly throughout 2. T. rusnelli. 



1. TYRBULA MULTISPINOSA. 

 I'l. 17, Fig. 13. 



This species is represented mainly by fragments of hind wings and hind 

 legs. ( )f the former nothing more can be said than that they appear to have 

 had a faint smoky tinge with numerous black, delicate veins, and that when 

 do>e<! they extended a very little beyond the tip of the abdomen. The 

 hind legs are long, moderately slender, the tibia- armed with exceptionally 

 numerous spines which are blackish, of uniform width to beyond the middle, 

 and then tapering, mainly by the excision of the under edge, giving them a 

 >li-htly upturned appearance, five or six times longer than their breadth at 

 the middle, and so close] v set that the interspaces and the spines are of equal 

 breadth: they decrease in length verv regular! v toward the base of the 

 tibia and in a -li-ht extent toward the apex; but just how manv there are 

 urlio\v tar the\ extend Inward the base the imperfect nature of tin- only 

 specimen pn-<er\ in^ the tibia forbids determining: it seems probable.- how- 

 ever, thai the number exceeds twenty-five. The specimen from Florissant, 

 preserving the femur, i.s placed here because its size agrees perfectly with 

 the other specimens and it* form indicates the relationship. It it is correctly 

 placed, the lemur i> stouter and less delicately attenuated than in the next 



Species. 



