BIOLOGY OF THE COTIOSTS. 



75 



lacunosa. In the Mclia berries it is parasitized by Cerambycobius 



CUSIIMANI, EUKYTOMA TYLODERMATIS, and PeDICULOIDES sp. 



CURCULIONID.K. APIOMN.K. 



Apion segnipes Say in Cracca virginiana is parasitized by Eury- 



TOMA TYLODERMATIS. 



Apion decoloratum Smith. Dr. Cliittenden records this weevil as 

 breeding in Meihomia paniculata and parasitized by Catolaccus 

 incertus. 



Apion griseum Smith. Dr. Chittenden records this weevil as 

 breeding in Phaseolus retusus, P. wrightii, P. poly stocky us, and 

 StropTiostyles paucijiora, and parasitized by Catolaccus incertus. 



Apion nigrum Smith. Breeds in buds of Rohinia pseudacacia and 

 is parasitized by Catolaccus incertus. 



Apion rostrum Say in pods of Baptisia is parasitized by Ceramby- 

 cobius CYANICEPS. 



CLEONIN.E. 



Lixus musculus Say. This weevil is known both from the Lower 

 Sonoran and Austroriparian zones. It breeds in the stems of Poly- 

 gonum pennsylvanicum., P. portoricense, and P. 

 punctatum, making an oblong gall or swelling. 

 It is parasitized by Eurytoma tylodermatis, 

 Cerambycobius cyaniceps, Neocatolaccus 

 tylodermse, Glyptomorpha rugator, G. novitus, 

 and Horismenus lixivorus. 



Lixus scrohicollis Boheman. This weevil (fig. 

 20) is probably confined mainly to the moist 

 Austral zones. It breeds abundantly in the 

 stems of Amhrosia trijida, A. artemisisefolia, 

 A. psilostachya, and Helianthus spp. It is 

 quite highly parasitized hj Ptinobiusmagnijicus , 



EU'KYTOMA TYLODERMATIS, CERAMBYCOBIUS 



CYANICEPS, Glyptomorpha rugator, G. mavaritus, 

 G. lixi, Vipio helfragei, Microdus simillimus, 

 and Horismenus lixivorus. Mr. Townsend has 



described LixopJiaga parva from a specimen reared from this weevil 



at Dallas, Tex., August 15, 1907. 



Fig. 20.— The bloodweed 

 weevil {Lixus scrobicoUis), & 

 cohost of boll-weevil para- 

 sites. Enlarged. (From 

 Hunter and Hinds.') 



ERIRRHININ^. 



/ Smicronyx tychoides LeConte. This weevil breeds in stem galls of 

 various species of Cuscuta. It is parasitized by ^Iicrobracon mel- 

 LiTOR and Eutrichosoma alhipes. 



