LYCAENINAE: RUSTICUS SCUDDERII. 969 



found as late as August 27, whiU' in that year in which they emerged 

 early in .Inly, their nunihers were diminishing by the 21st, and at 

 the end of the month all the speeiinens were "quite worn." They appear, 

 therefore, to flv for from four to six weeks. The eggs are doubtless gen- 

 erally laid in both July and August, but whether the mature larva or the 

 chrysalis hibernates is unknown. 



Habits and flight. The butterfly collects in large numbers on damp 

 ground. .Mr. Lintner once observed nearly two hundred in one spot, and 

 caught fifteen in a single sweep of the net : it may also be found on 

 leaves and flowers by the roadside with its wings partly expanded. 



Its flight is entirely similar to that of Cyaniris pseudargiolus but some- 

 what less vigorous ; like that species it keeps close to the ground. AVhen 

 walking up a vertical surface' the wings are kept back to back, erect, the 

 antennae on a plane with the body, but raised above it by the basal curve, 

 and divaricate about 90° ; they are alternately raised and lowered a 

 little. When hanging at rest, the costal edges of the four wings are 

 brought almost together, while the antennae, spread at an angle of about 

 60". are held forward from the vertical of the body at a slight angle. 



I cannot discover any odor in the males. 



Desiderata. The history of this butterfly needs to be closely followed 

 after August to determine in what condition the insect passes the winter. 

 If in the egg state, as one of its European congeners is said to do, where 

 is the egg then laid ? Our knowledge of the geographical distribution of 

 the insect leaves much to be desired ; it may be sought in the whole of 

 northern New England with considerable chance of success ; no parasites 

 have yet been obtained from the larva. Do the ants defend it so well that 

 it has none ? 



LIST OF ILLUSTRATIONS.— BUSTICUS SCUDDERII. 



General. Chrysalis. 



PI. 24, fig. 8. Distribution ia Nortli America. PI. 84, fig. 41. Side view. 



^„„ 86:15,16. Dermal appeudages. 



PI, 65, fig. 12. Top view. Imago. 



13. Side view. PI. e, fig. 6. Male, upper surface. 

 Caterpillar. 1. Female, both surfaces. 



PI. 71, fig. 4. Caterpillar at birth. 34 : 29. Male abdominal appendages. 



To : 36. Stage iii, dorsal view. 39 : 18. Neuratiou. 



38. Mature caterpillar, much enlarged. 46:29. Androconium. 



79:32-35. Front views of head, stages i, 55:7. Side view with head and appen- 



iii, iv, V. dages enlarged, and details of the struct- 



86:14. Caruncle, 8th abdominal segment. ure of the legs. 



