108 The Ohio Journal of Science [Vol. XXI, No. 3, 



(1886) recorded from British Columbia, but evidently in error. 

 The female of gilvipes is easily distinguished by the short, 

 yellowish translucent hemelytra (long-winged females are 

 rare), while the male may be distinguished from amhulans with 

 certainty only by the genital structures. Although Renter 

 (1883) records Mecomma gilvipes as occurring in Siberia, Oshanin 

 (1909) states that the species has as yet been found only in the 

 Nearctic region. 



Tichorhinus katmai new species. 



Fusco-brownish to blackish, median line on disk of pronotum pale; 

 narrowly at base of embolium and corium, a small spot at the cuneal 

 fracture, pale or translucent. Closely related to marginatus Uhler, 

 differs chiefly in the structure of the right genital clasper, particularly in 

 the shape of the apical half (Fig.). 



T. kat 



ma I 



Tichorhinus katmai n. sp. a. left genital clasper, lateral aspect. 



b. right genital clasper, lateral aspect. 



cf. Length 5 mm., width 1.6 mm. Pubescence and general form 

 similar to marginatus Uhler. Head: width .8,3 mm., vertex .44 mm.; 

 black, narrow tip of tylus and lower margin of bucculje pale. Rostrum 

 (length 1.45 mm.) barely attaining the hind margin of the intermediate 

 coxas, brownish to black, darker at the apex. 



Antenna: Black; segment I, length .44 mm.; II, 1.58 mm.; Ill, .94 

 mm.; IV, .74 mm. 



Pronotum: length .71 mm., width at base 1.25 mm.; black, a pale 

 vitta on the median line of the disk; scutellum black, transversely 

 rugulose; sternum and pleura black, ostiole having a pale streak 

 leading from the orifice. 



Hemelytra: Brownish black to black; narrow base of corium and 

 along the base of cubitus, pale translucent, apex of coriimi slightly 

 translucent through the brownish black coloration; embolium brownish, 

 translucent, paler toward the base; cuneus brownish black, pale 

 translucent on the margin of the fracture. Membrane uniformly dark 

 fuscous brown, the veins scarcely paler. 



Legs: Fusco-brownish to black, in paler specimens the brownish 

 may have a greenish tinge; tarsi black. 



