72 THE CANADIAN ENTOMOLOGIST. 



scale, and made with camera lucida. The upper figure represents the 

 wing of Rhagoletis ribicola, Doane, which affects the garden gooseberry 

 and currant in the State of Washington and in northern Idaho. It is a 

 native species, as I collected an adult on a wild gooseberry at Pollock, 

 Idaho, many miles from a railroad ; its original food was doubtless the 

 wild species of currant and gooseberry, so abundant in the Pacific 

 Northwest. 



There is another Trypetid, Epochra Canadensis, Loew, that infests 

 currants and gooseberries from Maine to Vancouver Island, but as it 

 belongs to a different genus I allude to it here only to note the similarity of 

 habit, and perhaps save some one from a wrong identification of its larva. 



The second figure shows R. cingulata, an eastern species infesting 

 cherries. It has been reported so far only from New Jersey and New 

 York, and doubtfully from the vicinity of Boston. I am indebted to 

 Professor Mark V. Slingerland for specimens enabling me to figure this 

 wing. 



The third figure shows our new species, R. intrudens, and the fourth 

 is the apple maggot, R. pomonclla, Walsh. The last is now pretty well 

 distributed in the eastern United States and Canada, but has not yet 

 appeared west of the Rocky Mountains, as far as I know, although I have 

 a specimen from Colorado. Walsh, in his original article, states that the 

 larvae are found in fruits of Crataegus, the thorn-apple, as well as in apple. 

 As it is a native species, we may suppose that the wild crabs and the 

 thorn-apples were its original food-plants. 



It remains only to notice Rhagoletis cerasi, Linn., which is a Euro- 

 pean species affecting cherries ; it may be introduced into the United States 

 or Canada at any time, in fact, there are one or two unconfirmed refer- 

 ences to it in our literature already. It strongly resembles in wing- 

 pattern the first of our figures, that of R. ribicola, but the clear transverse 

 band in the middle of the wing is widened in front and contains a triangu- 

 lar brown spot, the base resting on the costa and the apex extending to the 

 third vein. 



Explanation of Plate 4. 

 Fig. 1. — Rhagoletis ribicola, Doane. 

 " 2. — " cingulata, Loew. 



" 3. — " intrudens, n. sp. 



" 4. — " pomonella, Walsh. 



