KEY TO THE LONG=HORNS. 



10. Head and pronotum wholly black; elytra dull yellow, 

 with margin and suture blackish .... Strangalia acuminata. 



Head and pronotum not wholly black 1 1. 



11. Elytra yellowish, usually marked with black. Stran- 

 galia famelica (antennas black) and S. luteicornis (antennas 

 yellow). 



Elytra wholly black; head and pronotum reddish- 

 yellow Strangalia bicolor. 



12. Antennae with smooth, impressed, pore-bearing 

 spaces near the bases of the sixth or seventh and the 

 following joints. Typocerns. T. ingubris is all-black. 

 The elytra of velutinus are reddish-brown with four yellow- 

 ish spots (which may be enlarged to form partial bands) 

 on each, and of zebratus are black with one or two 

 basal spots and three bands, all yellowish, on each 

 elytron. 



Antennae without such spaces. The large genus 

 Leptura, of which the following are fairly common 13. 



13. Pronotum rather triangular or bell-shaped, widest 

 at base 14. 



Pronotum more squarish or rounded, usually con- 

 stricted in front and behind, hind angles not prolonged; 

 length, .3 to .5 in 16. 



14. Hind angles of pronotum prolonged 15. 



Hind angles not prolonged; length, .4 to .6 in. L. 



rubrica (antennas ringed with yellow; elytra reddish; 

 pronotum black; abdomen of male red, of female black) 

 and proxima (antennas not ringed; elytra dull yellow 

 except at tips, which are broadly and obliquely marked 

 with black). 



15. Over an inch long; pronotum black, with yellow 

 pubescence; elytra red, with black tips...L. emarginata. 



About .5 in., or less, long. L. lineola (narrow; elytra 

 decidedly narrowed behind, yellow, with black sutural, 

 median, and marginal stripes, which may be broken) and 

 nitens (pronotum black, with yellow pubescence, much 

 rounded in front of middle; elytra black with four golden 

 crossbars) . 



1 6. Pronotum scarcely narrow r ed in front and not con- 

 stricted behind; black; the elytra sometimes dull yellow 

 or with the tip alone dark L. mutabilis. 



351 



