October, '19] CROSBY AND LEONARD: HONEYSUCKLE MINER 389 



that the maxillae (mx.) and the antennae (ant.) are considerably shorter 

 in penitalis, and that the comparative length and breadth, as well as 

 the shape of abdominal segments eight to ten varies considerably. 



In the dorsal views (Figs, 18, 19, 2 and 5) it will be noticed that the 

 head projects considerably cephalo-laterad of the antennae in penitalis, 

 while this projection is very slight in nuhilalis. The dorsal surface 

 of the abdomen is considerably wrinkled in penitalis and the first seg- 

 ments show rather deep furrows near the middle of the segment as 

 indicated by dotted lines in the figure. On the first segment there 

 are two small teeth on the cephahc side of the furrow, one on each 

 side of the median line. On the second segment there are two or three 

 teeth on each side, a little farther laterad than on the first. The fur- 

 row on the third segment is narrower and shows no teeth. The setae 

 on penitalis mostly arise from small projections, which are not quite 

 so prominent in nuhilalis. In nuhilalis there are no dorsal furrows as 

 described in penitalis and the surface is very little wrinkled, though 

 somewhat roughened with minute projections. Near the caudal mar- 

 gin of abdominal segments four to six in nuhilalis are some small tri- 

 angular spines, never very distinct, which vary somewhat in number 

 and arrangement. In some individuals there are traces of spines on 

 segments three and seven. The lateral furrow of the tenth segment 

 shows much more distinctly in a dorsal view of penitalis. 



The lateral views (Figs. 18, 19, 3 and 6) merely emphasize some of 

 the points previously mentioned and show the difference in the size 

 of the lateral furrow of the tenth segment. 



Mr. D. J. Caffrey of the European Corn Borer Laboratory in Arling- 

 ton, Mass., furnished material for the study of P. nuhilalis, while Mr, 

 George G. Ainslie loaned material of P. penitalis, so that I am deeply 

 indebted to both for making this study possible. 



AN INJURIOUS LEAF-MINER OF THE HONEYSUCKLE 



By C. R. Crosby and M. D. Lkon'ard 



In August, 1917, our attention was called by Charles Fowler to a 

 serious outbreak of Lithocolletes fragilella Frey and Boll, on Bolgica 

 honeysuckle in a nursery at Honeoye Falls, N. Y. The plants growing 

 in the open were badly infested by the miners, nearly every leaf show- 

 ing one or more mines. In spite of this heavy infestation the injury 

 to these plants was negligil)le. When, however, cuttings were taken 

 from these plants and placed under glass in the cutting beds the leaves 

 were so badly injured l)y the miners tiuit the cuttings failed to grow. 

 Several hundred cuttings placed in the beds June 20 were a total loss. 



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