60 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



Other specimens found in the National Museum were reared from 

 galls as follows : 4 females and 2 males from Disholcaspis truckeensis 

 (Ashmead), Big Bar, Calif., L. H. Weld collector, bearing Weld's 

 record number 1622; 3 labeled "Ex Diplolepis echina O. S., Cali- 

 fornia, Weld #1707"; and 7 females and 10 males with record No. 

 2615°, reared from April 4 to 20, 1882, from petiole galls on live oak 

 (interpreted by Dr. William Trelease, University of Illinois, as Q. 

 virginiana) . These galls were collected by H. K. Morrison on March 

 24 and April 2, 1882 ; Mr. Weld also reared the following, except as 

 otherwise stated : 11 females and 6 males (Hopk. U. S. 15637°) Sep- 

 tember 28 and 29, 1922, from galls on Q. pungens at Tijeras, N. 

 Mex.; 1 female (Hopk. U. S. 15637') on July 1, 1922, from galls of 

 Callirhytis ruginosus (Bassett) on Quercus sp., Las Vegas, N. Mex.; 

 1 female (Hopk. U. S. 15639-^) , September 28, 1922, from galls on Q, 

 emoryi^ at Oracle, Ariz.; 5 females and a male (Hopk. U. S. 15922'') 

 May 21 and 28, 1918, from galls of Andricus (determined Middleton) 

 on Q. chrysolepls at Los Gatos, Calif.; 1 female (Hopk. U. S. 

 15607^=), June 17, 1918, at Paso Robles, Calif., from galls resembling 

 Neuroterus majalis (Bassett), on Q. douglam; 5 females (Hopk. U. S. 

 13687'=) July 12, 1918, at Esparara Cafion, Ariz., from galls of Ad- 

 leria (determined Weld) on Q. ohlongifolia; 6 females and 10 males 

 (Hopk. U. S. 15639*=) January 23, February 3, and September 28, 

 1922, mostly labeled Oracle, Ariz., from galls on Q. arizonica; 6 

 females (Hopk. U. S. 15604'^) at Prescott, Ariz., May 15 and June 1 

 and 17, 1918, from galls of Callirhytis ruginosus (Bassett), on Q. 

 grisea or arizonica; 8 of each sex (Hopk. U. S. 10781^) reared by 

 George Hofer, May 21 to July 16, 1919, Sycamore Flat, Ariz., from 

 galls on Q. ohlongifolia; and 5 females and 6 males (Hopk. U. S. 

 10773^) reared May 28 and June 11, 1919, by J. H. Pollock, Colorado 

 Springs, Colo., from galls on Q. gamhelii. One female labeled " Colo. 

 1257 " is in the collection of the Illinois State Natural History 

 Survey. 



Nowhere in the genus Decatoma has been observed so striking a 

 correlation between color development and geographical distribution 

 as in D. occidentcdis. There is good reason for including D. -florida 

 Girault as a member in the series that shows this correlation. These 

 species are extremely similar in being almost entirely black, with 

 only the anterior lateral upper corners of the pronotum, and some- 

 times a narrow ocular ring, yellow brown. Structurally they are 

 alike in the number of setae on the submarginal vein, and the form 

 of the head, which is almost or actually twice as wide as long, the 

 face feebly or not at all convex, and the surfaces, except the malar 

 space narrowly along the groove, are sculptured in a uniform manner 

 in both species. The differences between them are in the color of the 



