1903.] NATURAL SCIENCES OF PHILADELPHIA. 311 



The specimens above listed are rather smaller than any males in 

 the series of linearis, being 14 and 11 mm. in total length. 



The previous records for this species are from California, northern 

 Sonora and Teapa, Tabasco, Mexico. 



Genus FORFICULA Linnaeus. 



1758. Forficula Linnseus, Syst. Nat., X ed., p. 423. 



Type: F. auricularia Linnaeus. 



Forficula lugubria Dohm. 



1862. Forficula lugubris Dohrn, Entom. Zeitung, Stettin, XXIV, p. 230 

 [Cordova, Mexico.] 



Eleven specimens; four males, seven females; Orizaba, Vera Cruz, 

 Mexico. (H. Osborn.) [U. S. N. M.] 



These specimens differ from the original description in their more 

 reddish coloration. 



The previous records for this species cover from Durango, Mexico, 

 to Valladolid, Yucatan, and Vera Paz, Guatemala. 



Forficula metrica n. sp. 



Type:d^; Orizaba, Vera Cruz, Mexico. January 9-16, 1892. (H. 

 Osborn.) [U. S. N. M.] 



Closely aUied to F. lugubris Dohrn, but differing in the longer forceps, 

 which also bear an elongate low ridge on their internal upper surface, 

 instead of a comparatively high rounded projection as in lugubris. 



Size medium; form rather robust; surface glabrous, sparsely sup- 

 plied with short hairs. Head about equal to the pronotum in width; 

 interspace between the eyes rather tumid; antennae with but six 

 joints present, the basal one moderately robust, the third to sixth of 

 simple form, slightly increasing in length distally. Pronotum slightly 

 broader than long; anterior border truncate, lateral borders slightly arcu- 

 ate, the posterior subtruncate, the postero-lateral angles very broadly 

 rounded ; line of depression but slightly marked and crossing about the 

 middle; median hne shallowly sulcate anteriorly, narrowly carinate 

 posteriorly. Elytra of moderate width; shoulder well rounded and 

 not at all prominent; lateral margins parallel; posterior margin sub- 

 truncate. Exposed portion of wings half as long as the tegmina, 

 rounded. Abdomen with the median section considerably expanded; 

 two median segments with the lateral folds developed, the posterior 

 the heavier. Anal segment transverse, the posterior margin subarcu- 

 ate. Subgenital plate broadly triangular, the apex truncate. Forceps 

 almost equal to the remainder of the body in length ; the basal fourth 

 parallel, depressed and bearing a lamellate ridge along the internal 



