126 ENTOMOl^OGICAIv NEWS. [May, '19 



a few cases two, and as many as four were found. The com- 

 bined feeding and mining produces an injury which results 

 in kilHng the fohage completely, most of it drying and falling 

 to the ground. At Arlington the infestation was so severe that 

 practically every leaf on four or five medium sized trees was 

 infested. 



E.9g from dissected female. Length 0.6 mm. Greatest width 0.2 

 mm. Yellowish, oval, with broadly rounded extremities, one end slightly 

 wider than the other, chorion smooth. Females collected on July i 

 and dissected were found to contain from eight to thirteen well de- 

 veloped eggs and others in the process of development. 



Full grown larva. Length 4-5.5 mm. Width, including tubercles, 

 1.7 mm. Color yellowish white, becoming yellowish when full grown, 

 head and mouth parts dark. Body somewhat depressed, composed of 

 13 segments, apodous, anal end subtruncate. Sides of thorax and abdo- 

 men subparallel. Head with projecting mouth parts subtriangular, bear- 

 ing median, dorsal dark line and several hairs. First thoracic segment 

 flat, twice as long as second ; second and third of equal length ; first 

 thoracic segment with faint, dorsal, transverse, foveiform impression, 

 remaining thoracic and all abdominal segments except the last with 

 transverse, undulating, impressed line on dorsal surface ; lateral margin 

 of first thoracic segment bearing two hairs ; lateral dorsal portions 

 second and third thoracic segments and each abdominal segment bearing 

 two hairs arranged transversely. Abdominal segments subequal in 

 length ; sides of abdominal segments i to 8 produced into triangular 

 tubercles, each bearing a hair. Ventral surface somewhat similar to 

 dorsal, except that the lateral portions of the thoracic and abdominal 

 segments bear only one hair. All hairs comparatively long, with some- 

 what tuberculate bases. 



Adult. This was described by Suffrian in his paper "Frag- 

 mente zur genauern Kenntniss deutscher Kafer" (Entomo- 

 logische Zeitung, zu Stettin, 1840), who gives Populus nigra 

 as the food plant and the localities Aschersleben, Magdeburg 

 and near Leipzig. The following description is from the 

 original and from Blatchley's re-description : 



"Elongate-oblong, convex. Black, except for the head, thorax, legs, 

 pro- and mesosterna and the first three antennal joints which are clear 

 yellow. Scutellum brownish. Thorax longer than wide, strongly con- 

 vex, sides extended into prominent tubercles, surface coarsely punctate. 

 Antennae stout, less than half the length of the body. Length 3.5- 

 4.5 mm." 



