20 
termination. The species 1s single-brooded, temporally 
and spatially associated with the other commoner Spe- 
cies of the genus. As the name implies, it 18 a hickory 
feeder. 
Satyrium edwardsil (Saunders) 
Edwards’ hairstreak 
Thecla edwardsii Saunders 1869:98 (type-locality re- 
stricted to “Queenstown, Ontario” by Michener & 
dos Passos 1942:4 by designation of neotype) ; Wor- 
thington 1880: 48. 
Thecla edwardsi: Holland 19302254. 
Strymon edwards Klots doled 30: 
Satyrium edwardsu: dos Passos 1970:29 (No. 365). 
Illinois records.—Map 50. 
§. edwardsii is locally common_to abundant in as- 
sociation with the host plant, oak (Quercus). Confusion 
with S. calanus falacer is possible. This is a single- 
brooded, midsummer butterfly, with earliest and latest 
dates of observation June 12 and August Ih 
In Illinois, edwardsti appears to be limited chiefly to 
the northern half of the state, principally the north- 
eastern portion. It has been recorded only once from 
Streator, La Salle County, during 30 years of collecting 
there, and the work of Downey and his associates in 
southern Illinois did not disclose its presence. Thomas 
Taylor found it abundant at Mason State Forest, Mason 
County, where the adults were present on butterfly-weed 
(Ascle pias tuberosa) . 
Satyrium acadica (Edwards) 
Acadian hairstreak 
Thecla acadica Edwards 1862a:59 (type-locality “Lon- 
don, [Ontario}’) ; Worthington 1880:48; Holland 
193): 237; 
Strymon acadica: Klots 105 F136: 
Satyrium acadica: dos Passos 1970:29 (No. 368). 
Illinois records.—Map 91. 
Except for an unconfirmed record from Alton in 
Madison County, all records of acadica are from the 
northeastern counties. It is frequent to common locally, 
where the host plant, willow (Salix) occurs. There is 
probably one brood; the species has been taken from 
June 14 through August on 
Eumaeus atala Poey 
Atala 
Eumenia atala Poey 1832(1): Plate Eumenia + text 
3 p. (type-locality “Havana, Cuba’’). 
Eumaeus atala: Holland 1931:223; Klots 195121325 
dos Passos 1970:30 (No. 370). 
French (1900:395) recorded this species from Car- 
bondale, Jackson County. Since it seems inconceivable 
that he could have confused this distinctive species with 
any other, we do not doubt the accuracy of the record. 
However, we rely on the usual explanation of such oc- 
currences: that the insect, in some stage of develop- 
ment, may have been transported to Illinois, perhaps 
on the Illinois Central Railroad, which has a direct line 
between Carbondale and southern Florida. The but- 
terfly is not a regular part of the Illinois fauna. 
Calycopis cecrops (Fabricius) 
Red banded hairstreak 
Hesperia cecrops Fabricius 1793:270 (type-locality 
“West Indies’). 
Thecla poeas: Worthington 1880: 48. 
Thecla cecrops: Holland 193% 239: 
Strymon cecrops: Klots 1951) Maes 
Calycopis cecrops: dos Passos 1970:30 (No. 379). 
Illinois records.—Map 52. 
The Cook County record is apparently a casua' 
stray. In southern Illinois, cecrops is rare but occur: 
consistently and likely has local populations. 
Callophrys polios (Cook & Watson) 
Hoary elfin 
Incisalia polios Cook & Watson 1907:202 (type-localit 
“Lakewood, New' Jersey’) ; Klots 1951: 14% 
Thecla polios: Holland 193122208 
Callophrys polios: dos Passos 1970:31 (No. 382). 
Illinois records —Coox County: Chicago, May | 
1911, Wyatt (FMNH). Lake County: Waukega 
Dunes (Lllinois Beach State Park) (Fig. 2), many spec 
mens, dates, collectors, and sources. 
C. polios is well established and often common | 
abundant at Illinois Beach State Park im associatic 
with its host, bearberry (Arctostaphylos uva-urst). 
flies at about the same time as Euchloe olympia, tl 
other butterfly virtually endemic to that locality in Il 
nois but appears somewhat earlier. On May 12, 195 
Leuschner found it “numerous almost beyond comp 
hension” there (RL). It probably does not reach tl 
level of abundance in every season but does occur co 
sistently and is usually common. The flight is close 
the ground, and the butterfly often rests on the fo 
plant. It is single-brooded. The earliest and latest da 
of capture are April 25 and May 28. but the flig 
season is short and in any one year probably does 1 
exceed 2 weeks within this general period. 
Callophrys irus (Godart) 
Frosted elfin 
Polyommatus irus Godart “1819” [1824]:674 (ty) 
locality “America?’’). 
Thecla irus: Worthington 1880:48; Holland 1931:2 
Incisalia irus: Klots 1951:148. 
Callophrys irus: dos Passos 1970:31 (No. 383). 
Illinois records.—Lake County: Beach, May 
1922, Liljeblad, determined by J. C. Downey (INH 
The male and female specimens of the above | 
ord, the only positively known specimens of tus fi 
Illinois, were damaged in a fire at the University 
Northern Iowa in March, 1970, while being stuc 
by Downey. A single-brooded, rare, and local specie 
early spring, irus may easily be confused with I. hen 
It should be found elsewhere in Illinois. We have rec 
from nearby Lake County, Indiana. 
Callophrys henrici (Grote & Robinson) 
Henry’s elfin 
Thecla henrici Grote & Robinson 1867b:174 (type-I 
