SUBFAMILY III. F( >UF I ( ' r 1 . 1 N .10. 



55 



fourth not longer than third; second joint of tarsi dilated on each 

 side to form a heart-shaped lobe and prolonged beneath the third. 

 Two genera occur in our territory. 



KEY TO THE EASTERN GENERA OF FORFICULIN.E. 



o. Antennae 12-jointed, the fourth segment twice as long as broad; legs 

 of male forceps widely separated and feebly depressed at base and 

 then only on the inner margin. (Fig. 29.) I. DORU- 



aa. Antennae 14- or 15-jointed, the fourth segment less than twice as long 

 as broad; legs of male forceps contiguous at base where they are 

 strongly depressed and much broadened. II. FORFICULA. 



I. DORU Burr, 1007, 123. (Gr., "spear.") 



Antenna? with segments three and four nearly equal ; prono- 

 tum longer than wide; inner wings (in our species) usually rudi- 

 mentary; abdomen subparallel, feebly dilated; pygidium of male 

 armed with a distinct tubercle or spine. 



KEY TO EASTERN SPECIES OF DORU. 



o. Form robust; spine of pygidium of male distinctly shorter than the 



last ventral segment. (Fig. 29.) 10. ACULEATUM. 



aa. Form much more slender; spine of pygidium of male as long as the 



last ventral. (Fig 26, d.) 11. DAVISI. 



10. DORU ACULEATUM (Scudder), 1876f, 262. Spine-tailed Earwig. 



Dark chesnut brown; palpi, legs, edges of pronotum and outer two- 

 thirds of tegmina yellow. Pronotum longer than 

 broad, narrower than head. Tegmina nearly 

 twice as long as pronotum, truncate; inner wings 

 usually aborted. Forceps of male, three-fourths 

 as long as abdomen slender, curved, bent down 

 ward a little at basal third, becoming again hor- 

 izontal a little before the tip, a pointed tooth pre- 

 sent at second bend; of female shorter than those 

 of male, their legs nearly straight, the lower inner 

 edges very finely crenulate and usually contiguous 

 for most of their length, the tips incurved. Length 

 of body, <J, 811, 9, 7.510; of tegmina, $ and 

 9, 2.53: of forceps, $ , 4.76, 9, 33.5; of 

 Fig. 29. Dom acu- pygidial spine, $ , .8 1 mm. 



\catnm (Scudder.) Male 

 X 2-5- (Original.) 



Posey Co., Ind., April 1) ; fifteen specimens from beneath rub- 

 bish and leaves in woods along the north bank of (he Ohio River, 

 one mile southwest of Mt. Yernon ; Kosciusko Co., Ind., June 24, 

 a dozen or more taken by sweeping sedges and high marsh grasses 

 along the edges of James Bay, Tippecanoe Lake (W. 8. B.). 



