OF WASHINGTON, VOLUME XIII, 1911. 59 



the foliage, exuding a sticky substance which holds them to the 

 leaf; as they grow they work down the stem; when grown a 

 dark shell grows over their back and finally covers them; they 

 pupate in this cell (Mitchell). 



BARIDIIN^E. 

 Baris aerea Boheman. 



November 15, 1906 (Mitchell); November 18 (Pratt). 

 Baris subovalis Le Conte. 



August 2, 1906 (Crawford). 

 Baris transversa Say. 



On Ambrosia May 29, 1905 (Mitchell); May 30, 1905 (Yoth- 



ers). 



Onychobaris subtonsa Le Conte. 



On Ambrosia, May 29, 1905 (Mitchell). 

 Madarellus undulatus Say. 



November 3 (Schwarz). 

 Trichobaris texana Le Conte. 



On cotton (Gossypium) April 20, 1904 (Walker); July 22, 

 1905 (Mitchell); breeds very commonly in the stems of Solatium 

 rostratum. From a lot of infested stems of Solarium rostratum 

 collected December 15, 1908 (Mitchell) there were bred during 

 January, February, and March, 1909, many Cerambycobius 

 cushmani Crawford, Neocatolaccus tylodermce Ashmead, Ceram- 

 bycobius cvaniceps Ashmead, Eurytoma tylodermatis Ashmead. 

 During the winter of 1909-10, Mr. Mitchell isolated 424 para- 

 sites belonging to these four species (Pierce). 



Stethobaris species. 



September, 1905 (Mitchell). 

 Geraeus albotectus Casey (Centrinus). 



July 8, 1907, on Acacia (Mitchell). 

 Geraeus penicellus Herbst (Centrinus). 



On seed heads of joint-grass July 15, 1905 (Mitchell). 

 Geraeus picumnus Herbst (Centrinus). 



August, 1905 (Mitchell). 

 Odontocorynus denticornis Casey (Centrinus). 



On seed heads of joint-grass, July 11, 1905 (Mitchell). 



