BIOLOGY OF THE COIIOSTS. 



79 



CEUTORHYNCHIN^. 



Auleutes tenuipes LeConte. Tliis weevil l)reccls in the anthers of 

 buds of Galpinsia Jiartivegi on the Texas black prairie at least. It is 

 attacked by Catolaccus incertus, Microhracon sp., Eutrichosoma 

 alhipcs, and possibly by Catolaccus nigrosenea. 



Craponius insequalis Say. This weevil ])reeds in the fruit of the 

 grape. It is parasitized by Microbracon mellitor and Stihoscopus 

 hrooksi. 



RMnoncus pym^hopus Boheman. Tliis weevil breeds in the stems 

 of Polygonum and is parasitized by Cerambycobius cyaniceps. 



Ceutorhynclius n. sp. This weevil breeds in the crown of Selenia 

 aurea and is parasitized by Catolaccus incertus. 



Baris cuneipennis Casey. This weevil breeds in the roots of 

 Helenium tenuifolium and is parasitized by Catolaccus incertus. 



Orthoris crotcJiii LeConte. This 

 Lower Sonoran weevil breeds in the 

 seed pods of Mentzelia nuda. It is 

 parasitized very higldy by Microbracon 

 nuperus, Eurytoma tylodermatis, 

 and a species of Tctrastichus. 



TricJioharis texana LeConte. This 

 species breeds very abundantly in 

 stems of Solanum rostratum, and is 

 hence more or less a Lower Austral 

 insect. Its parasites are Cerambyco- 

 bius cyaniceps, Eurytoma tyloder- 

 matis, Microbracon sp., and Sigal- 



PHUS CURCLXIONIS. 



TricTioharis trinotata Say. The po- 

 tato stalk weevil (fig. 25) breeds in 

 the stems of many Solanaceae, includ- 

 ing SoJanum carolinense, S. melongena 

 (egg plant), S. rostratum, S. tuberosum 

 (potato), Datura stramonium, D. tatula, PJiysalis longifolia, P. pMladel- 

 pJiica, P. lanccolata, P. heteropliijUa, and P. virginiana ambigua. It is 

 known to be parasitized by Sigalphus clticulionis and Eurytoma 



TYLODERMATIS. 



Tricliobaris compacta Casey. Tliis weevil breeds in the pods of 

 Datura stramonium and is also recorded as breeding in Datura mete- 

 loides. It is parasitized by Cerambycobius cyaniceps, Myiophasia 

 -enea, and Pediculoedes ventricosus. 



Fig. 25.— The potato-stalk weevil ( Tricho- 

 baris trinotata), a cohost of boll-weevil 

 parasites: a. Beetle; b, larva from side; 

 c, pupa; d, section of potato stalk opened 

 to show larva and pupa in situ, a, b, c, 

 Five times natural size; d, natural size. 

 (From Chittenden.) 



