REPORT OF STATE ENTOMOLOGIST. 41. 



caterpillars sometimes become very abundant and, together with 

 cabbage aphis and the European cabbage butterfly, very often ruin 

 the crop unless measures are taken for their control. This insect 

 was rather prominent throughout the state last season and was 

 noticeably injurious in Bozeman. Though an introduced species 

 this insect is well establishd and abundant on native vegetation. 

 I have on several occasions seen it on wild vegetation in mountain 

 canyons, far away from cultivated fields. 



THE EYE-SPOTTED BUD-MOTH, Tmet^cera ocellana 

 Schrif. Family Tortricid.b, Order Lepidoptera. 



In the spring of the year we received from Townsend specimens 

 of what we believe to be the larvae of this highly important pest. 

 This insect has previously been found only from the western part of 

 the state. Its injuries are most apparent in the spring, when the 

 larvae feed on the leaf-and flower-buds; not only destroying'- or less- 

 ening the fruit crop on bearing trees, b;iL also causing serious injury 

 to young growing trees by cutting off teiminal buils and producing 

 abnormal branching. 



THE CURRANT SPANWORM, Cymatophora ribearia Fitch. 

 Family Geometrtd^, Order Lepidoptera. 



This well known eastern species was found in a garden in Bill- 

 ings in June and was very abundant. it had almost completely de- 

 foliated the gooseberries on which it was working. A "looping" 

 caterpillar which from the description and habits is probably this 

 same insect was also reported from the ]Va:rr rancli a few miles west 

 of Billings. The caterpillars are yellow with black spots and the 

 moths are pale yellow with faint and variable markings of brownish. 



THE ROSE SLUG, Monostegia rosae. Family Tenthredin- 

 iD^, Order Hymenoptera. 



This widely distributed pest of roses, feeds on the leaves, eatin,^ 

 oft the surface and causing the rest of the leaf to die and turn h'-own. 

 Whole rose bushes are often given a brown color from this cause. 

 Ihis insect was particularly common in the vicinity of Bo^ei-iaii last 

 sr.mmcr and was found also in other parts of the state. The green 

 slugs or larvae are so nearly of the color of the living rose leaf that 



