HESPERlltl: THANAOS HORATIUS. 1489 



Comparisons. Tlio present species is ilarljor than jnvenalis ; tlie fore wings searooly 

 ditlcr in color from tlie liind wings and are Hedged witli gray witli not lialf llic nni- 

 forniity tliat is seen in jnvenalis; hind wings not enlivened with the pale spots near the 

 outer border to the extent that generally holds in juvenalis, especially in the ? ; the 

 submedian cinereons spots never occnr in horatius, and the ex-tra-mesial band of 

 dark spots is less connected and regular in lioratins than in juvenalis. 



Distribution (28: 8). Probably this butterfly has a distribution very 

 similar to that of T. juvenalis witli which it has frequently been confounded, 

 but it is not known from so far in the interior ; it is a member of the Alle- 

 ghanian and Carolinian faunas and has been taken in central and northern 

 Texas (Pjclfrage, Boll), Florida, both at the Keys and on the St. John's 

 Eiver (Palmer), Georgia "common" (Abbot), North Carolina (Morrison), 

 District of Columbia (Dodge — Mus. Yale Coll.) and Maryland (Weide- 

 meyer) . 



In New England it has been found only in the southern half and in the 

 following localities — Amherst (Parker), Amherst Notch (Scudder), Fox- 

 boro (Emery), Andover (Scudder) and the vicinity of Boston, Mass. (Mer- 

 rill, Minot, Scudder), and Guilford (Smyth — Mus. Yale Coll.) and New- 

 Haven, Conn. (Mus. Yale Coll.). 



Food plant. The caterpillar raised by Judge Chapman, which I have 

 considered as of this species, was found on Wistaria frutescens. 



Seasons. The memoranda concerning its appearance are so meagre that 

 only an uncertain account of its history can be given. It is double brooded 

 both north and south, having been bred March 8 by Abbot* in Georgia, 

 and on August 1 by Chapman in Florida ; it was taken in Texas in a fresh 

 condition on July 15 (Belfrage), and again by Palmer, fresh, in the latter 

 part of July at the Florida Keys and in the middle of August on the St. 

 John's. In the north it probably appears at about the same time as juve- 

 nalis, since I took males at Andover on the 18th of May in the same condi- 

 tion and in the same localites as males of juvenalis. That a second brood 

 flies appears from my taking fresh males at Waltham, the last day of 

 June, others, condition not noted, in the Middlesex Fells, July 24; while 

 at Amherst Professor Parker took it July 4 and at Amherst Notch I caught 

 or saw a dozen or two on August 4. 



Desiderata, Nothing more is known of its history and every fact is 

 desirable. The too brief descriptions of the caterpillar and chrysalis also 

 need verification, so that our account is nowhere complete. 



LIST OF ILLUSTBATIONS.-THANAOS HOEATIUS. 



PI. 36, figs. 13-16. Male abdominal appendages- 

 47: 10. Scales of male imago. 

 57: 7. Side view, with head and appen- 

 dages enlarged, and details of the structure 

 of the legs. 



• The species is not absolutely certain. 



•87 



