THE CANADIAN ENTOMOLOGIST 139 



Fully normal upon all points, its individuality is yet shown in the miiform- 

 ity and large size of tubercle I on all abdominal segments. This is about three 

 times the size of a spiracle and equals IV, ordinarily the largest general plate. 

 On joint ten, the evanescent l\"a becomes the largest lateral plate of the five 

 here stirrounding the spiracle. The anal plate is normal, brown. 



Last stage: More of the early colouring is retained at this time than 

 usual, the dull pinkish ground colour giving defi'nit'ion to the ^ pale 

 yellowish lines, which remain as before. Head shining brown, with blackish 

 shade at ocelli ; width, 3.25 mm. Body robust smooth, cylindric, livid ; setae 

 weak. Onjoint one the cervicn.l ?hield is wider than head and is margined with 

 black laterally. On joints four, five and six tubercle I is reduced; on ten the 

 same arrangement holds as formerly, and all tubercles are indicated by blackish 

 plates. The spiracle on joint eleven is not enlarged, as it is with the fern feed- 

 ers. Lengths, 52 and 56 mm. for the stages respectively. 



The pupa is correspondingly robust, shining brown and active; there is 

 no frontal development and the cremaster consists of two separate and slightly 

 divergent, curved hooks. The transformation is made in the ground after a 

 rather lethargic resting period, the date of leaving the burrow being from Aug. 

 10 to 25, so far as could be determined. 



A Tachinid fly claimed a large percentage of the observed larv?e, and 

 doubtless is a regular check in this case, as with others. It seems to be, accord- 

 ing to Dr. J. M. Aldrich, Masiccra seniles M*. 



With the full evidence at hand there is no question as to the standing 

 of this as a distinct species. There is, however, the question yet open as to 

 what one of the species Guenee's type of nitila may finally fit in with. Draw- 

 ings of that type indicate a narrow winged, yellow form, with brightly white 

 stigmata, and there seems no fear of duplication in the case of aralix. Serial 

 position near uicrriecata and arcfk'oreus may be accorded it. 



Our specimens of eraliac were collected in the woodlands bordering the 

 DuPont Bouvelard, beginning about two miles south of EHendale, thence south- 

 ward wherever the foodplant occurs in abundance, for a distance of about fifteen 

 miles. The wide southern and western distribution of the foodplant (Pennsyl- 

 vania to Florida and Texas) makes it probable that the associated insect, may 

 also prove to be a widely distributed species with a range possibly approximately 

 that of the plant. 



Explanation of Plate vl 



Fig. 1 — Papaipcma araliae, penultimate stage larva. 

 2 — Papaipema araliae, mature larva. 

 3 — Papaipema araliae, male. 

 4 — Papaipema araliae, female. 



A REVISION OF THE CANADLVN SPECIES OF THE AFFINIS GROUP 

 OF THE GENUS TABANUS (DIPTERA). 



BY J. MCDUNNOUGH, PH.D. 

 Entomological Branch, Ottawa* 



jn connection with the preparation of a complete list of Canadian species 

 of the genus Tabanus it became necessary to revise thoroughly the existing iden- 



♦Contribution from the Entomological Branch, Dept. of Agriculture, Ottawa. 



