REVISION OF TRIBE ERRHOMENELLINI — OMAN 173 



Distribution. — The original description was based on specimens 

 of both sexes from Pulhnan, Wash. (C. V. Piper). One of the fe- 

 males, which bears Baker's red label, is considered the type. I have 

 also examined specimens from the following localities in Washington: 

 Yakima (A. R. Rolfs), Ritzville (M. C. Lane), north of Dryden 

 (A. L. Melander), Ellensbiirg (W. W. Baker) ; and Moscow, Idaho 

 (J. Gillett). 



Carsonus, new subgenus 



Differing from typical Errhomus as indicated in the key, and in 

 addition having the hooklike processes of the male pygofer heavily 

 sclerotized and bearing sharp spines or serrations, or both. In the 

 subgenus Errhomus the hooklike processes of the male pygofer are of 

 the same texture as the pygofer, and are bent ventrad posteriorly. 

 In Carsonus the style has a sharp toothlike projection on the ventral 

 surface about one-third the distance from the apex. Aedeagus of 

 Carsonus as illustrated (pi. 6, figs. 12, 12C). 



Type of the subgenus, Acocefhalus maculatus Gillette and Baker, 

 1895. 



ERRHOMUS (CARSONUS) IRRORATUS (Ball) 



Plate 6, Figures 12-12C 

 Errhomenellus irroratus Ball, Can. Eut., vol. 34, p. 18, 1902. 



Rather robust; face strongly convex; crown of female distinctly 

 longer than that of male. Length of female 5.5-6.5 mm, of brachyp- 

 terous male 3.75^ mm, of macropterous male 4.4-5 mm. 



Female pale sordid yellow, heavily irrorate with fuscous and black; 

 male fuscous to black, with numerous small circular yellow spots. 

 Crown of female longer than pronotum, that of male equal to or 

 shorter than pronotum. Fore wings of brachypterous specimens 

 obliquely subtruncate, reaching to base of fourth abdominal segment. 

 Fore wings of macropterous males with outer anteapical cell either 

 present or absent, central and inner anteapical cells either open or 

 closed basally. 



Seventh sternite of female long ; posterior margin notched medially 

 and strongly sinuated between median notch and lateral angles. 

 Male plates slender, of nearly uniform width ; tips blunt. 



Pygofer process of male with two toothlike projections, distal 

 portion rounded and finely serrate on dorsal margin. Style broadened 

 before apex and with a hook on ventral surface; tip pointed and 

 recurved. Aedeagus rather stout basally, tapering distally and 

 slightly curved. 



Distribution. — Originally described from two females from Siski- 

 you County. Calif. (Koebele). The description of the male is based 



