THE CANADIAN ENTOMOLOGIST 57 



underside of the leaf in a fine web, whereas Scudder emphatically states of 

 tharcs (Butt. New Eng. I , p. ()37) that "not the slightest web of any kind is spun." 

 With regard to the adults they are, in the male sex at least, quite readily separ- 

 able from tharos; apart from the fact that they appear at least ten days earlier 

 en the wing than tharos in this vicinity, the narrowness of the orange-banding 

 on the upper side of both primaries and secondaries is quite characteristic; a 

 comparison of our figures 2 and 6 will show that in batesi the first extra- discal 

 row of spots is well separated by the black ground colour from the following 

 series of spots, whilst in tharos, especially on the secondaries, there is a strong 

 tendency for the two rows to coalesce; in batesi this same inner row of spots 

 on the primaries is distinctly paler in colouration than the remaining orange 

 spots, a feature which, to my mind, throws the species into the campestris — 

 con:iUus group, in fact, I have little doubt that batesi is the eastern representa- 

 tive of the West Coast campestris. On the underside of secondaries the male 

 of batesi almost entirely lacks the dark semicircular patch so characteristic of 

 tliarqs (vide figs. 4 and 5). In the female all these points of distinction fail 

 to a greater or less degree and individual specimens are often extremely difficult 

 to place correctly. Up to the present time nothing regarding the life-history 

 has, to my knowledge, been published: I therefore append a more detailed ac- 

 count of the various stages. 



Ovum. — \^ery similar to that of tharos (according to Scudder's description) ; 

 pale green, conical, with truncate apex, base slightly rounded. The lower half 

 of the sides and the base covered with numerous small, slightly depressed, 

 hexagonal cells; upper half with about twenty vertical ribs, slightly raised. 

 Surface of the truncate apical portion very faintly reticulate, almost smooth 

 Height .6() mm., width of apex .2 mm. Greatest width (at about 1/3 height), 

 .5 mm. 



Larva. — Stage I. Head black-brown, broader than first segment, with 

 lobes well rounded and divided posteriorly; hairs short, whitish. Body pale 

 ochreous (greenish after feeding) with long, single, whitish hairs arising from 

 minute tubercles. Prothoracic plate slightly darker than surrounding integu- 

 ment, broad, lunate posteriorly, with the lateral anterior edges forming a slight 

 ande centrally at their junction point. Along the anterior margin six hairs 

 o\-erhang the head, three on each side of the centro-dorsal line; subdorsally on 

 the posterior margin are two additional hairs. On the abdominal segments 

 tubercle I is situated subdorsally about the centre of the segment; its long white 

 seta is inclined forward. Tubercle H is well laterad to I and near the posterior 

 margin of the segment; its seta is very short and points slightly backward. 

 Tubercle HI, situated centrally on the segment, bears a long hair similar to I, 

 curxing outward and forward; IV is slightly nearer the posterior margin of 

 segment than HI, V is in line with HI, each with a fine white seta, directed 

 outward; M and MI represented by single hairs near the base of prolegs. In 

 late stages of this instar the incipient spines of the following instar may be seen 

 as large round disks which do not coincide in position with the primary tubercles. 

 Length 2 mm. 



Stage II. Head black, small, with rather sparse long hair. Body pale 

 ochreous with greenish tinge. The primary tubercles have disappeared and 

 the customary spines are now pre.-ent. Prothorax without spines but with 



