254 



11, Sixth antennal joint as long, or very nearly as long, as the first. 



t2. spinax 'Dohru. Blackish; eighth segment of antennae 

 pale at tip; base and extreme tip of wings and whole 

 of tarsi pale yellow; third, fourth, and fifth dorsal 

 segments of abdomen conspicuously prolonged lat- 

 erally in a backward curve, tapering and pointed ; 

 forceps of male with the tip bearing a backward- 

 directed hook, and the middle of inner border denticu- 

 late. Body ll^"™ ; forceps 4°^"^. Mexico. 



b. Abdomen but little or not at all expanded in the middle ; all 

 the dorsal segments before the last of nearly equal 

 length in both sexes. 

 FoRFicuLA. Whole body more or less flattened, generally 

 long and slender; antenncie usually a little more than 

 half as long as the body, 10-14-jointed, the joints 

 cylindrical, scarcely larger at the apex than at the 

 base, seldom as little as four times as long as broad ; 

 teg mina present.; wings usually present; first tarsal 

 joint a little longer than the third, the second short, 

 but dilated apically and lobate, passing beneath the 

 third joint; second and third abdominal segments 

 with lateral plications; forceps of varied construc- 

 tion. 



^ ( Wings protruding beyond the tips of the tegmina b. 



' \ Wings wanting, or shorter than the tegmina Tc. 



, ( A large pale spot at base of tegmina c. 



' \ Tegmina concolorous or vittate d. 



Wings unicolorous; forceps slender 2. bimaculata. 



Wiugs bicolorous; forceps stout 3. Percheroni. 



Male forceps with an inward and upward directed basal 



d. ^ lamella 4. lugubris. 



( Male forceps with no such lamella e. 



f Middle legs very much nearer the fore legs than the 



^ ! hind legs ./. 



' j Middle legs only a little nearer the fore legs than the 



( hind legs Ji. 



Male forceps attingent at extreme base.. 5. auricularia. 



Male forceps widely separated at extreme base g. 



( Tegmina longitudinally vittate 6. tceniata. 



^' \ Tegmina concolorous 7. tolteca. 



( Inner edge of male forceps with a post-median tooth, 



8. exilis. 

 I Inner edge of male forceps with no distinct post-median 



/ tooth ...A. 



\ Inner edge of male forceps sharply and profusely den- 



. j ticulate 9. californica. 



' I Inner edge of male forceps with a single sharp basal 

 (^ tooth 10. pulchella. 



J Forceps of male long, but shorter than abdomen, only 

 a little curved 11. aculeata. 

 Forceps of male longer than abdomen, but little 



I curved 12. ruficeps. 



I Forceps of male short, strongly bowed 13. vara. 



\ 



/•I 



^ 



