MEXICAN ORTHOPTERA. 219 



the latter broadly. Anal segment with four parallel rows of punctures, the poste- 

 rior margin truncate, except for the pygidium which is transverse, with the margin 

 truncate. Forceps moderately long, parallel, the apex strongly incurved, the 

 base of the internal margin bearing on the inferior surface a lamellate extension 

 which terminates in a heavy tooth, the superior-internal margin bears centrally 

 a tooth much smaller than the one before mentioned, the inferior margin from 

 this point bearing a narrow lamellate edge. 



General color black, the anal segment and forceps reddish brown, the latter 

 much the darker. Basal joints of the antennae blackish brown. Limbs and 

 lower surface dull reddish brown. 

 Measurements : 



Length of body 6.75 mm. 



Length of forceps ..... 2.50 " 



Length of pronotum 1.25 " 



Length of elytra and wings . . . 3.00 " 



Ancistrogaster luctnosns Stal. 



1855, Ancistrogaster liietuosus Stal, Ofv. Vet.-Akad. Forh., xii, p. 349. 



Four specimens, females ; Jalapa, Vera Cruz, viii, and Teocelo, 

 Vera Cruz, viii. 



This species has never before been recorded north of Las Mer- 

 cedes, Guatemak^. 



Aacistrogaster toltecus (Scudder) 



1876, Forficula tolteca Scudder, Proc. Bost. Soc. Nat. Hist., xviii, p. 361. 



One specimen % ; Orizaba, Vera Cruz, June 6, 1899. 



Aucistrogaster sp. ? 



One specimen, 9 ; Cuernavaca, Morelos, vi. 



This specimen is unfortunately headless, and apparently cannot 

 be placed under any of the known species of the genus. The 

 absence of the head and antennee, which are very important, makes 

 it difficult to arrive at any satisfactory conclusions. 



Apterygida ffeiiiata (Dohrn). 



1862, Forficula tseniata Dohrn, Stett. Ent. Zeit., xxiii, p. 230. 



Nineteen specimens, 8 males, 11 females; Orizaba, Vera Cruz, 

 June 6, 1899 (2), Jalapa, Vera Cruz, viii (12), Teocelo, Vera Cruz, 

 viii (3), Cuernavaca, Morelos, vi (2). 



Family BLATTID^. 



Thyrsocera cincta Burmeister. 



1838, Thyrsocera cincta Burmeister, Handb. d. Ent., Bd. ii, Abth. ii, pt. i p. 499. 



Three specimens, males ; Orizal)a, Vera Cruz, June, 6, 1899. 



TKAN8. AM. ENT. SOC, XXVII. MAY, 1901. 



