OF WASHINGTON', VOLUME XVIII, 1916 



Tylopterus pallidus LeConte breeds in the berries of Forestieria 

 acuminata at Victoria, Texas. It enters the ground for pupation. 

 Tyloptems varius breeds in the berries of Adelia pubescent at 

 Dallas. 



Cylindrocopturus adspersus LeConte breeds in the stalks of 

 Helianthus multiflorus, Ambrosia trifida and Xunthium in Texas. 

 C. mammillatus breeds in the stems of Verbesina virginica in 

 Texas and Oklahoma. C. operculatus Gyllcnhal breeds in the 

 stems of several species of Hymenopappus at Dallas. The 

 species of this genus pupate in the larval cell. The larvae arc 

 usually found in the pith and arc characterized by the dark 

 spiracular areas. 



Cryptorhynchus fallax LeConte breeds in the stems of Co.^in 

 at Victoria. 



Rhyssematus lineaticollis Say breeds in the pods of Asclepiodora 

 viridis and Asclepias latifolia in Texas. The larvae enter the 

 ground for pupation. R. pruinosus breeds in the pods of Mimosa 

 fragans in South Texas. R. palmacollis Say breeds in the seed 

 pods of Ipomoea sinuata at Victoria, Texas. 



Chalcodermus vittatus Champion breeds in the seed of the balloon 

 vine (Cardiospermum halicacabum) in south Texas. The larvae 

 enter the ground for pupation. 



Tyloderma subpubescens Casey breeds in the stems of Poli/- 

 gonum punctatum and P. portoricense at Victoria, Texas. 



Conotrachelus similis Boheman breeds in the berries of Bumelia 

 lanuginosa in south Texas. C. leucophaeatus breeds in the stems 

 of Euphorbia marginata. C. naso breeds in the acorns of Quercti* 

 virginiana. C. albicinctus was bred at Dallas from a gall on 

 Cornus cainH<!iasimus. The larvae of C onotrachelus enter the 

 ground for pupation. 



Conotrachelus elegans Boheman is a very important enemy 

 of nuts. In Texas the first generation breeds in the petioles 

 and new shoots of hickory (Hicoria alba}. Later individuals 

 are found commonly in the leaf galls of Phylloxera devastalri.r 

 on pecan (Hicoria pecan). Still later in the season, the species i> 

 bred from nuts of various species of Hicoria. C. posticatus 

 Boheman and C. affinis Boheman both breed in. hickory nuts in 

 Louisiana. 



Perigaster cretura breeds externally on the leaves and stems of 

 Ludwigia natans in south Texas. The larvae are yellow and 

 have a gliding motion. They spin a silken thread with which 

 they form a covering while they ('at. They work mainly under 

 water. The pupal cell is composed of silk and a dark substance 

 and is impervious to water. The adult is saltatory. This 

 genus is confined to the plant genus Lud trig/a. 



Barinus squamolineatus Casey breeds in the roots of a rush 



