REVISION OF TRIBE ERRHOMENELLINI — OMAN 175 



Distribution. — In addition to three specimens from Colorado 

 (Baker collection), I have examined two females from Soldier, Utah 

 (Ball), and a male from Ephraim, Utah (Ball). 



Remarks. — According to the statement accompanying the original 

 description of maculatus^ it was described from two female speci- 

 mens, but after a careful study of the description and illustrations, 

 together with a male specimen la])eled "type," I have concluded that 

 the type specimens were actually males. The specimen labeled "type" 

 fits exactly the illustrations of the head and genitalia, and the length 

 is nearly as indicated. What is described and illustrated by Gillette 

 and Baker as the last ventral segment of the female is actually the 

 shallowly incised and strongly appressed eighth sternite of the male. 

 Moreover, the plates of this male bear a strong resemblance to the 

 ovipositor sheath of a teneral female, 



ERRHOMUS (CARSONUS) ARIDUS (Ball) 



PLAT^: 6, Figure 10 

 ErrlwmcneUus oridus Ball, Can. Ent., vol. 41, p. 183, 1909. 



Closely related to rnacuhifus, but with the apex of the crown sub- 

 angular and the posterior lateral angles of the seventh sternite of 

 the female more produced. Length of female (>-6.5 mm, of brachyp- 

 terous male 4 mm, of macropterous male 4.5 mm. 



Pale sordid yellow, with irregular spots and maculations of brown 

 and fuscous. Usually with fewer dark markings than either irroratus 

 or macuJatus. 



Macropterous male usually with three closed anteapical cells in fore 

 wing. Seventh sternite of female long, posterior margin much pro- 

 duced laterally, incised medially, and either incised or strongly 

 sinuated between median notch and lateral angles. Male plates as 

 in irroratus. 



Pygofer process of male with two curved, hooklike projections 

 extending mesad. Styles and aedeagus as in iiroratus. 



Distribution. — Originally described from four males from Reno, 

 Nev. The description of the female is based upon a specimen from 

 the tyi)e locality, April 30, 1908, E. D. Ball. Examples of arklus 

 are at hand from Reno, Nev. (Ball) ; "Nevada" (Uhler collection) ; 

 Kanab, Utah (Ball); Craig, Colo. (Beamer) ; Durango, Colo. 

 (Oman) ; Naches, Wash. (Beamer) ; and Cliffdell, Wash. (Oman). 



ERRHOMUS (CARSONUS) ARIDUS FURCATUS, new subspecies 



Plate 6. FicrRES 11, llA 



Externally identical with typical andus but with the pygofer 

 process of the male bifurcate posteriorly in dorsal view, the two forks 



