HO THE BIOLOGICAL REVIEW. 



The producer of this gall, for which I propose the name 

 Diplosis monardi, is not altogether of the true Diplosis type. 

 In the venation of the wings, and in some other particulars, it 

 nears the Lasioptera type. 



The parasites, I believe, are undescribed species. 



These galls may be collected in the fall season as soon as 

 the leaves begin to drop, as keeping them in a dry jar over 

 winter does not seem to injure the larvae, but it is best to collect 

 in the spring season. 



Galls on Plants of the Genus Rubus. 

 DIPLOSIS FARINOSO, O.S. 



" Rounded, woody swellings at the base of the leaflets, or 

 on the mid-rib, of the common blackberry contains red larvae." 

 (O.S.) 



Galls on leaf petioles of Rubus villosus, usually on the lower 

 side of petioles at the base of leaflets, occasionally entirely sur- 

 rounding petiole and extending up mid-vein ; rarely on side 

 veins. In a collection of twenty-seven galls, from several 

 localities, twenty-one were on petioles at the base of leaflets, 

 five on the upper half of mid-veins, and one on side vein. 



Galls usually roughly spherical, varying to ovate and cylin- 

 drical. The largest spherical gall I have yet found measured 

 10 mm. in diameter. An average of fifty of the most spherical 

 was 6 mm. diameter ; an average of twenty-five of the more 

 ovate was 6 mm. x 8 mm. ; an average of twenty-five of the 

 largest and most cyndrical was 8 mm. x 15 mm. 



Galls collected August 28, 1892, were immature, soft and 

 juicy, the larvae minute, closely confined in their cells. When 

 mature the galls are of a dark straw color, inclining to greyish, 

 surface roughened with rather deep irregular cracks. The 

 interior is uniformly soft, spongy and toughish, becoming rather 

 friable, of a light brown color, becoming darker with age. 

 Each gall contains from one to fifteen cells. When mature the 

 larvae are still closely confined in their cells, and are of a bright 

 straw color. 



