BIOLOGY OF THE COHOSTS. 



79 



CEUTORHYNCHIN^ . 



Auleutes tenuipes LeConte. This weevil breeds in the anthers of 

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

 attacked by Catolaccus incertus, Microbracon sp., Eutrichosoma 

 albipes, and possibly by Catolaccus nigroxnea. 



Craponius insequalis Say. This weevil breeds in the fruit of the 

 grape. It is parasitized by Microbracon mellitor and Stihoscopus 

 hrooksi. 



Khinoncus pyrrhopus Boheman. This weevil breeds in the stems 

 of Polygonum and is parasitized by Cerambycobius cyaniceps. 



CeutorJiyncJius 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 

 Eelenium tenuifolium and is parasitized by Catolaccus incertus. 



Orthoris crotcTiii LeConte. This 

 Lower Sonoran weevil breeds in the 

 seed pods of Mentzelia nuda. It is 

 parasitized very highly by Microbracon 

 nuperus, Eurytoma tylodermatis, 

 and a species of Tetrastichus. 



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 CURCULIONIS. 



TricJioharis trinotata Say. The po- 

 tato stalk weevil (fig. 25) breeds in 

 the stems of many Solanaceas, includ- 

 ing Solanum carolinense, S. melongena 

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

 (ipotsito) , Datura stramonium, D. tatula, Physalis longifolia, P. pMladel- 

 pMca, P. lanceolata, P. TieteropTiylla, and P. virginiana ambigua. It is 

 known to be parasitized by Sigalphus curculionis and Eurytoma 



TYLODERMATIS. 



TricJioharis compacta Casey. This weevil breeds in the pods of 

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

 hides. It is parasitized by Cerambycobius cyaniceps, Myiophasia 

 ^NEA, and Pediculoides 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.) 



