340 Mr. G. 0. Champion on various 



J 4 . Elytral apices sinuate-truncate and sutural 

 angles sharp in S $ * '• d wltri eniarginate 

 tegmen and acuminate penis-sheath .... No. 27. 

 a 3 . Elytra constricted posteriorly in <$ , subparallel 

 in J , sharply costate laterally in both sexes : 

 $ with joints 2 and 3 of anterior tarsi pro- 

 duced at inner apical angle, the tegmen 

 rounded at tip, and the penis-sheath acumi- 

 nate , No. 28. 



(P, Terminal abdominal segment with a long process 

 on each side in <5, the tegmen truncate, and the 

 penis-sheath acuminate; elytra bicostate, the 



inner costa prominent No. 29. 



b': Wings wanting or rudimentary ; elytra not costate : 

 J with joints 2 and 3 of anterior tarsi produced 



at inner apical angle No. 30. 



b. Metasternum bituberculate or bidentate in r? ; elytra 

 uni- or bicostate ; wings fully developed : S with 

 tegmen truncate or feebly eniarginate and penis- 

 sheath acuminate, 

 c'. Elytral apices rounded or truncate in S , bispinose 



and deeply eniarginate iu 2 > . . . . Nos. 31-36. 



d'. Elytral apices rounded or subtruncate in S , sinuato- 

 truncate, and with the sutural angles sharp and 

 overlapping, in £ Nos. 37-39. 



1. Astylus trifasdiatus. 



Dasytes (Astylus) trifasciatus, Guer. Icon. Regne Anim. p. 48, t. 15. 



tigs. 2-2 c ; Redt. Reise Novara, ii. p. 109. 

 Mecoglossa rugosa, Solier, in Gay's Hist. Chile, iv. p. 426, t. 10. 



figs. 5-5 g. 



£ . Ventral sutures 1-4 oblique fiom the outer margin to 

 median line; segment 1 with a stout hook in the middle at 

 the base; segment 5 long, divided into two, widely separated, 

 apieally convergent lobes, which are broadly subtruncate at 

 the tip, the median portion membranous. Terminal segment 

 elongate on the dorsal aspect, transverse on the ventral 

 aspect, angulate on each side towards the apex beneath, the 

 apical portion dilated laterally into a broad, vertical, inwardly 

 concave, securiform lobe, and the apical margin toothed in 

 the centre above. Tegmen with moderately long, ciliate, 

 feebly curved, lateral lobes, which are subtruncate or bluntly 

 rounded at the tip. Penis-sheath very strongly, bisinuately 

 curved, tapering at the tip. 



$ . Ventral segment 6 about as long as 5, cleft, and 

 separated laterally from the dorsal portion. 



Hab. Chile. 



Apparently a common species in some parts of Chile. 



* Possibly a variable character in this species, A. aitadriliheatus. 



