48 MISIC. PUBLICATION 4 70, TJ. S. DEPT. OF AGRICULTURE 



visible sternite broadly emarginate at apex (emargination sinuate and trans- 

 versely truncate at middle), the lateral margins strongly serrate; eighth tergite 

 coarsely serrate and rather deeply, narrowly emarginate at apex, densely granu- 

 lose and coarsely punctate, but not longitudinally carinate. Prosternum 

 coarsely, confluently punctate, sparsely clothed with very long, erect, whitish 

 hairs ; anterior margin with a distinct, broad, short, median lobe. Anterior femur 

 with a long, acute tooth, which is coarsely dentate on outer margin. Anterior 

 tibia slightly arcuate, with a small, angular dilation near apex; middle and 

 posterior tibiae straight. 



Length 8 mm., width 2.8 mm. 



Redescribed from a male paratype collected at the type locality, 

 May 27, 1936, on the gum plant (Grindelia robust®, Nuttall) by A. T. 

 McClay. 



Female. — Differing from the male in having the head uniformly brownish cupre- 

 ous, the antenna brownish cupreous, with a vague greenish tinge, the pro- 

 sternum more sparsely punctured and less densely pubescent, the last visible 

 sternite broadly rounded at apex, the eighth tergite broadly rounded at apex, 

 and the anterior tibia nearly straight and unarmed near apex. 



Type locality.— Fairfield, Solano County, Calif. ; type in the Cali- 

 fornia Academy of Sciences. 



DISTRIBUTION 



From material examined: 



California: Fairfield, Solano County, May 27, 1936 (A. T. McClay). Tracy, 

 San Joaquin County, June 2, 1920; Dixon, June 3, 1920 (E. P. Van Dyke). 

 Marin County, August 16, 1937 (C. J. Drake and F. Andre). 



Host. — The larval habits are not known, but since both A.. T. Mc- 

 Clay and E. P. Van Dyke collected the adults on the gum plant 

 (Grindelia robust a Nuttall), it is probably the host plant for this 

 species. 



The color on the upper side of the body is slightly variable, and 

 in some specimens is more greenish or cupreous than in the paratype. 

 Only a few examples were available for study and in some of these 

 the smooth callosities and gibbosities on the pronotum and front of 

 the head were absent, and the anterior margin of the pronotum 

 slightly sinuate, with the median lobe scarcely indicated. In the 

 males the emargination at the apex of the last visible sternite is 

 transversely truncate at the middle or regularly arcuate. The 

 pubescence is slightly longer on the specimen from Marin County 

 than on the paratypes. The length is from 6.5 to 9 mm. 



This species is closely allied to fragariae, but it differs from that 

 species in having the tooth on the anterior femur acute, the last visible 

 sternite of the male broadly, shallowly emarginate at the apex, and 

 the last visible sternite of the female transversely sinuate at the apex. 



Van Dyke (1937) states that the pubescence is longer and finer on 

 grindeliae than on deleta, deserta, lixa, fragariae, and subpubescens 

 Fall (typographical error for pubescens) but this is not the case in the 

 paratypes of grindeliae examined by the writer. 



