Kinsey: Studies of Cyriipidx 



137 



Plagiotrichus suttonii variety polythyra (Kieffer) 



CalUrhytis polythyra Kieffer, 1904, Bull. Sec. Metz, (2), XI, p. 132; 

 1904 (in Baker), Invert. Pacif., I, p. 44. Dalla Torre and Kieffer, 

 1910, Das Tierreich, XXIV, pp. 586, 802, 825. Johnson and Ledig, 

 1918, Pomona College Journ. Ent. and Zoo., X, p. 25. 



CalUrhytis quercus-snttoiii Fullaway, 1911 (in part), Ann. Ent. Soc. 

 Amer., IV, p. 357. 



FEMALE. — Shows the following characters in addition to those com^ 

 mon to all varieties of the species: Color darker rufous; first two seg- 

 ments of the antennae piceous black; mesonotum quite hairy; parapsidal 

 grooves narrower than in suttonii, wider than in lustrior ; anterior 

 parallel lines not wholly smooth, extending not half way to the scutellum; 

 mesopleur^ smooth and naked on only a small area beneath the tegulae; 

 hind coxse brownish rufous to piceous; areolet moderately large; first 

 abscissa of the radius very weakly angrJate, almost without a spur; 

 length 2.5-3.5 mm., averaging distinctly smaller than in suttonii. 



GALL. — Differs from the galls of the other varieties in being robust, 

 not as slender as in lustrior, reaching 30. mm. in diameter by 40. mm. in 

 length, usually smaller. On Quercus agrifolia. 



RANGE. — California: Claremont (Baker) ; Pasadena, El Toro. 

 Restricted to a more southern range of Q. agrifolia. 



TYPES.— At the Berlin Museum? Cotypes at Pomona College. 

 Material from the same collector (Baker) and the same locality (Clare- 

 mont) at Stanford University and The American Museum of Natural 

 History. 



Insects were already emerging from galls collected at 

 Pasadena on February 22, 1920 ; some were still emerging on 

 March 2, 



Fullaway stated that Beutenmuller in litt. had pronounced 

 polythyra and suttonii synonyms. I do not recall that the 

 synonomy has been otherwise published. The two insects are 

 very closely related, but polythyra differs in having a smaller 

 areolet, a weakly angled first abscissa, and in being generally 

 smaller; the ranges of the two are distinct, and the galls 

 differ somewhat, mostly in size. The references to these vari- 

 eties occurring on Quercus chrysolepis undoubtedly apply to 

 Andricus spectahilis Kinsey, the gall of which resembles the 

 gall of suttonii, altho the insects are generically very 

 ' distinct. 



Plagiotrichus suttonii variety lustrior, new variety 



FEMALE. — Shows the following characters in addition to those 

 common to all varieties of the species: Generally brighter rufous in 

 color; first two segments of the antennae distinctly rufous; mesonotum 

 much less hairy than in the other varieties; parapsidal grooves more 



