540 



U. S. NATIONAL MUSEUM BULLETIN 216 



i • ri i , — J L 



Figure 258, 259. — Localities: 258 (left), Grotea anguina; 259 (right), G. 



calif ornica. 



All collecting dates are between June 1 and July 9 except as follows : 

 April 19 at Calvert, Tex.; May 9 at Parker Creek, Sierra Ancha, Ariz.; 

 May 18 at Oak Creek Canyon, Ariz.; May 20 at Boulder, Colo., 

 May 27 at "Perdix," Pa.; May 28 at Takoma Park, Md.; July 17 at 

 Holliston, Mass.; and Aug. 21 at Madison, Wis. This seasonal dis- 

 tribution proves that there is a single generation per year and is in 

 agreement with published accounts of the biology. In our own experi- 

 ence the species occurs in open bushy country, along fence rows, and 

 the edges of fields. It flies rather slowly among the tops of weeds, and 

 along the sides and over the tops of bushes. Its long yellow and brown 

 antennae held anterolaterally and its long pale body give it a singular 

 appearance. Once, we found a specimen on flowers of Viburnum. 



Rearing records on pin labels are: 9, from sumac, Knoxville, Tenn., 

 1921, C. N. Ainslie. 9, from sumac stem, Vienna, Va., 1936, J. C. 

 Bridwell. 9, from sumac, Nyack, N. Y., Mar. 25, 1884, J. L. 

 Zabriskie. cf, from Ceratina dupla, Flatbush, Long Island, N. Y., 

 Sept. 5, 1892, J. L. Zabriskie. 



This species is in the Carolinian and Austroriparian faunas and 

 also in Colorado and Arizona. There is one generation per year, 

 emerging in late spring and disappearing before mid-summer. Its 

 hosts are species of Ceratina, nesting in twigs with pithy centers. 



2. Grotea californica Cresson 



Grotea californica Cresson, 1878, Proc. Acad. Nat. Sci. Philadelphia, vol. 1878, 

 p. 370;?. Type: ?, California (Philadelphia) . 



Front wing 4.5 to 9.5 mm. long. Structure similar to that of 6. 

 anguina except as stated in the key. 



Color similar to that of G. anguina except that the postmedian 

 iuscous band on the antenna is less distinct, especially in the male, 



