206 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



the axils of this twig. Three flies from Bassett are in the United 

 States National Museum from the Ashmead collection, and Ashmead 

 had placed them in the genus Trigonaspis in the case. They can not 

 be separated in size, coloration, or sculpture from the males of radicis 

 Ashmead. Using the width of the head as a base, the length of 

 mesonotum ratio in pumiliventris is 1.5 and 1.6; in radicis, 1.5; wing 

 ratio in pumiliventris, 5.5 and 5.6; in radicis, 5.27; length of antenna 

 ratio in pumiliventris, 4.77; in radicis, 5.01 ; third segment of antenna 

 in pumiliventris measures 0.61, 0.63, 0.67, 0.69 of width of head; 

 in radicis, 0.59, 0.61. 



T. radicis was described from one male and four female specimens 

 from Utah, June 20, 1885, the gall being on the roots of an unknown 

 oak. The types are in the United States National Museum together 

 with ten others determined by Ashmead as radicis collected by 

 E. A. Schwarz at four different localities in Utah in June, 1893. The 

 writer has twenty males and two females which agree with these. 

 They were taken at Colorado Springs, Colorado, on July 1, 1915, 

 by sweeping on scrub oaks. As the males of these can not be sepa- 

 rated from those of pumiliventris Bassett, radicis becomes a synonym 

 of the older name. 



B. Colorado was described from a single female captured June 18, 

 1892, at Dolores, Colorado. Through the kindness of Professor 

 Gillette the writer has been able to examine the tj^pe and finds that 

 the front tibiae lack the characteristic spur of a Belonocnema and 

 that it is a Trigonaspis and can not be separated from the female of 

 radicis Ashmead. The head is not widened behind the eyes, the 

 malar space has a groove and is 0.39 length of eye (in types of radicis, 

 0.36-0.40). Claws with tooth. Wing without spots or clouds. 

 Wing ratio, 5.0 (in radicis, 4.82). Mesonotum ratio, 1.6 (in radicis, 

 1.56). Both have transfacial line about 1.1 times facial. Both 

 have interocular area about 1.1 times as broad as high. Both have 

 antennocular space less than ocellocular. As radicis is a synonym of 

 pumiliventris based on a comparison of the males, and the female 

 Colorado agrees with the female of radicis, both radicis Ashmead and 

 Colorado Gillette become synonyms of pumiliventris Bassett. 



Genus BIORfflZA Westwood. 



11. BIORH1ZA CAEPULIFORMIS (Beutenmueller). 



Plate 30, fig. 9. 



Andricus caepuliformis Beutenmueller, Ent. News, vol. 22, 1911, pp. 67-70. 

 Biorhiza caepuliformis Beutenmueller, Beutenmueller, Canad. Ent., vol. 49, 



1917, p. 348.— Felt, Key to Amer. Ins. Galls, N. Y. St. Mus., Bull. 200, 1918, 



p. 66. 



The galls of this species occur singly or in clusters of as many as 30 

 at the base of vigorous young saplings or sprouts from stumps, 

 usually hidden by debris and often inclosed in a cylindrical case 



