328 



the genera referred by Prut'. Brad\ to his sub-family '/'ti<-hi<IHit<i'. the genus 

 />>nin l*.--t nut Boeck (= .lonesiella Brady) and ]-'nlt<ti<t Scott are included in this 



family, and moreover .'! in-\v genera, to lie treated of further on. 



Gen. 74. TaehldiUS, Lill.M-borg, lsr>:i. 



i-ic Clittrnrti r*. Bod\ -hort. sub-depressed. with the anterior division 

 liroader than the posterior. Rostral projection not defined behind. Genital 

 segment in female imperfectly subdivided in the middle. Caudal rami of moderate si/e. 

 Anterior antenna? comparatively short and thick, though composed .of 6 or 7 well 

 defined joints: those in male very strong, subcheliform. Posterior antennae with 

 the proximal joint distinctly subdivided, outer ramus comparatively small, In- 

 articulate. Oral parts comparatively less fully developed than in most other 

 Tachidiidffi, though of normal structure. Natatory legs very powerful and some- 

 what resembling in structure those in the Ci/lx/initlii. 1st pair differing only 

 slightly from the succeeding pairs, and having the inner ramus distinctly 3-arti- 

 culate; 2nd and Mrd pairs somewhat transformed in male. Last pair of legs 

 simple, lamelliform, with no boundary between the distal and proximal joints 



/iY///"//,N. This genus was established as early as the year 1S5M by Prof. 

 Lilljeborg, and is the type of the present family. In addition to the species 

 originally described by Lilljeborg, ~2 other species have been recorded in recent 

 times, vi/., T. ItUi/riilifi Poppe, and T. ci-ii.^irdi'ni* Scott. I am acquainted with 

 only the type species. 



211. Tachidius brevicornis, Lilljeb. 



(PI. ciAVIII \ CCXIX). 



iSi Lilljeborg, !> crii-ijiri-i^ i-\ crilinilius Irilnis in Sciinia .MTiirrfiililnis, p. |!'i,. 

 I'l. XXII. Sgs. I'J If.. I'l. XXIII, ftgs. ll-J. it. PI. XXVI. li^s. !7 \ IS. 



SMI: '/'ili'll'ltl'ilix r/rsr/yirs. I ', ios! irccli I . 



f i'hm -iiftt i:<. Fniiiilr. Body conipai'at ively shoj-t and stout, rapidly 

 tapering beliind. \\ith the anterior division oblun-- oval in outline, and distinctly 

 ilepres^.-d in front. Cephalic segment large, exceeding in length (he ,'! succeeding 

 meiits combined, rostral projection obtusely conical in form. Last pedigerous 

 -'jiiieiil con-idei-ably narrower than the preceding one. I'rosome short, not attai- 

 ning e\en hall'ihe length of the anterior dixision. and gradually tapering behind. 



