314 . THE CANADIAN ENTOMOLOGIST. 



very often have the walls mined by Birdaua, and it may be that these 

 svveUirgs are more spongy and tender than tlie bases of unaffected plants. 

 Pupation is reached by the litter b.-fore nelita iarvse are quite mature, and 

 its appearance is correspondingly sooner. Busck's type was inadvertently 

 labelled "bred from ffeliant/uis,'' which is here corrected. 



Nelita larv?e Wii.vt found in the last two stages, and it proved to 

 belong to the section possessing the continuous dorsal line. An inflate 

 at maturity shows some individuality, and its description is as follows : 

 Head normal and agreeing with allies; 2.4 mm. in width. Shield wider 

 than head, though its length, dorsally, is less than usual. All tubercles 

 defined with black plates, the usual discrepancy in the size of some is not 

 apparent. For instance, I is comparable to IV in point of size on all 

 abdominal segments, a feature which rarely happens; in fact, all are very 

 similar, except 111^:, which is normally small, and lies very close to the 

 spiracle at its upper anterior corner. The abdominal leg plates are equally 

 evident and bear three setre. On joint ten IV is normally pilaced low 

 down, with no accessory plate above at the upper posterior side of the 

 spiracle. The latter are black. The anal shield is comparatively small, 

 the two dorsal plates preceding on this joint are not merged with it, or 

 with each other. The body tapers at each extremity ; its colour is white, 

 all lines lost, the semi-,translucence less livid than in many others. 

 Length, 35 mm. 



Maturity occurs July 15th fo 20th, and the pupa is formed under a 

 slight depth of soil or moss. It is a very ordinary, normal pupa, no 

 development at the clypeal region, its colour darker and less shining than 

 any species here described. Length. 17 mm. Dates of emergence, 

 September ist to 15th. 



Papaipema frigida. Smith. — The description of the species thalictri, 

 Lyman, and its so called variety, perobsoleta, in this magazine for Septem- 

 ber, 1905, drew attention to the Meadow Rue as being a ])referred food- 

 jjlant in its case, where our own experience had only heretofore 

 encountered cataphracta woikitig in this jjlant. The western Pennsyl- 

 vania fauna was found to be jirolific of the species, and due search finally 

 disclosed it in the home locality. In the series bred all are those having 

 white-marked stigmata, and their resemblance to cerussata is striking for a 

 species whose larvae differ so obviously, and it is likely that flown 

 examples of one could easily be mistaken for the other. This reflection 

 leads to inoiher, presenting a question that dates back to the Revision of 



