472 Dr. T, A. Chapman's Contribution! s to 



are pale rufous. The markings which are not very strong are a pale 

 line down each side of dorsum and along each lateral flange and a 

 rather darker line down mid-dorsum and one half-way down " slope " 

 outlined paler below. There are paler markings at anterior 

 extremity. 



The clothing of hairs, lenticles, etc., in the 1st instar con- 

 forms closely to the ordinary arrangement of these struc- 

 tures in the Plebeiids ; comparing Figs. 18 and 19 with 

 those of P. icarus and A. ther sites, for example, in Plates 

 XXXVII and XXXVIII, Trans. Ent. Soc. 1914, a little 

 difference in the outline of the piothoracic plate appears, 

 but the only marked difference is in the two hairs above 

 the spiracles (III ?). In icarus and thersites the hair points 

 or bases are present, but any hairs are very minute or 

 evanescent, in eros the anterior of these has a hair about 

 0*075 mm. long, longer on 6th abdominal segment and 

 on 7th 0'15 mm. long, quite comparable with the hairs 

 of tubercle I which are 0-2 to 0-225 mm. long. The pos- 

 terior of these two tubercles (III ?) has a minute hair about 

 0-02 to 0-025 mm. long. 



In the 2nd instar the disposition of hairs and lenticles 

 is very similar, though there is some little difference in the 

 boldness of the hairs. 



The larvae hibernate in the 3rd instar; no exception 

 to this was observed, their appearance at this stage is 

 well shown in Figs. 1 to 4. At this stage they contrast 

 with the larvae of P. icarus and A. thersites in being much 

 browner, hardly to be called green at all, the tone of the 

 majority being that shown in Fig. 4. 



The armament in this stage is apparently of much the 

 same character as in icarus, thersites, etc., though the 

 strength of tubercle III is still shown by there being two 

 moderately long hairs at this position, the other species 

 having only one. 



My 1913' notes say- 

 February 8. — Brought a larva from refrigerator into 

 warm room. 



February 11. — Larva began to move, and being put on 

 leaf of Oxytropis campestris began to eat. 



February 12. — Has mined out a portion of leaflet and 

 made some half-dozen small pellets of frass. 



February 14. — Continues eating; has attacked 5 or 6 

 leaflets (still small), hardly looks any larger. 



