10 
P. mystic is apparently limited to northeastern Ihi- 
nois. It is locally frequent. We follow Brown (1966c) 
in ascribing the authorship of mystic to Edwards rather 
than Scudder. The species is single-brooded, from May 
99 through July 15. Most records are from mid-June. 
Hesperia ottoe Edwards 
Ottoe skipper 
Hesperia ottoe Edwards “1866” [1867]:207 (type-local- 
ity ‘“Kansas’) ; Klots 1951:239; dos Passos 1964: 12 
(Nos t2 )e 
Erynnis ottoé: Holland 1931 O74: 
Illinois records—LakE County: Waukegan, July 
98, 1946, 1 @, Wyatt (FMNH). Mason CouNTY: 
Mason State Forest, July 19, 1963, 1 2, Taylor, deter- 
mined by H. A. Freeman (INHS) (Fig. 1); Mason 
State Forest, July 11, 1964, 1 %, July 19, 1964, 8 
Srey ee ey ilee (A 
Irwin (1971) has noted the recent discovery of this 
species in Illinois. The status of ottoe in Illinois is un- 
certain. All specimens taken in Illinois have been found 
in sand areas. 
Hesperia dacotae (Skinner) 
Dakota skipper 
Pamphila sassacus dacotae Skinner 1911:412 (type-local- 
ity “Volga, South Dakota’’). 
Erynnis dakotae: Holland 193U3 74: 
Hesperia dacotae: Klots 1951:238; dos Passos 1964: 12 
(Nom li 3): 
H. dacotae was credited to Illinois by Klots CNS HME: 
937, key to Hesperia). There are three specimens of 
dacotae in the Carnegie Museum from Illinois. They 
are a male, labeled in part “Ridgeland, 1895, W. E. 
Longley,” from the A. W. Lindsey collection; another 
male, very dirty, labeled “sassacus 3 /Ills.” in the hand 
of W. H. Edwards; and a female, labeled in part “No. 
Ill. 1889” and “Hesperia dacotae ? Skin. det. A. W. 
Lindsey 1940.” We assume that Lindsey also examined 
the other two specimens listed and rely upon his de- 
terminations. These specimens may have been the basis 
for Klots’ record. Ridgeland, in 1895, was a station on 
the Chicago and North Western Railroad, about one 
mile east of Oak Park, Cook County. The status of 
dacotae in Illinois at the present time is unknown. In 
view of the great ecological change in the Chicago area 
since the late 19th century, it would appear most un- 
likely that a prairie species such as dacotae would have 
been able to maintain itself there, but the recent find- 
ing of Hesperia ottoe in the state may belie this as- 
sumption. Perhaps it occurs elsewhere in northern Ilh- 
nois, especially in the extreme northwestern portion of 
the state. Lindsey, Bell, & Williams (1931) did not 
mention Illinois in their discussion of dacotae, but it may 
be that Lindsey was unaware at that time of the ex- 
istence of the Illinois specimens. 
Hesperia sassacus Harris 
Indian skipper 
Hesperia sassacus Harris 1862b:315 (type-locality “Mas- 
sachusetts”) ; Klots 1951:238; dos Passos 1964:12 
(Nor 114): 
Pamphila sassacus: Worthington 1880:49. 
Erynnis sassacus: Holland 1931:373. 
Illinois records.— Cook County: Evanston, June 27 
1896, Snyder (FMNH). H. sassacus should be of mor 
frequent occurrence in Illinois than the single recor 
sndicates. Worthington indicated personal knowledge « 
its capture in Illinois. We have numerous records fror 
nearby localities in northwestern Indiana. 
Hesperia leonardus Harris 
Leonard’s skipper 
Hesperia leonardus Harris 1862b:314 (type-locali 
“Massachusetts”) ; Klots 1951:237; dos Passos 196: 
LORIN aie 
Pamphila leonardus: Worthington 1880:49. 
Erynnis leonardus: Holland 1931:376. 
Illinois records—Cook County: Spears Woo 
Forest Preserve, September 4, 1972, Irwin and Seabo 
(INHS, NGS). Mason County: Mason State Fore 
September 1, 1963, September, 1964, Taylor (INF 
TT). Prorta County: Kickapoo Creek, 1956, Tay! 
(TT). Vermition County: Danville, August 24, 19 
Ellis and Irwin (TE, INHS) (Fig. 1). 
This distinctive late-summer and autumn spec 
should be more numerous and widespread in Illin 
than these few records indicate. There is one bro 
flying exclusively in late August and September. 
Hylephila phyleus (Drury) 
Fiery skipper 
Papilio phyleus Drury 1773(1) :25 (type-locality “: 
tigua, St. Christopher’s, Nevis, etc. )e 
Pamphila phylaeus: Worthington 1880: 49. 
Hylephila phylaeus: Holland 1931:377. 
Hylephila phyleus: Klots 1951:243; dos Passos 1964 
(Now L226 
Illinois records.—Map 16. 
Scattered records of this species are at hand throt 
out Illinois. It is fairly common in late summer 
autumn. There are a few early season records, perl 
representing overwintering individuals. It has been 
served May 14 through October 9, with most rec 
in September. 
Thymelicus lineola (Ochsenheimer) 
European skipper 
Papilio lineola Ochsenheimer 1808:230 (type-loc 
“Germany ’). 
Adopaea lineola: Holland 1931:366; Klots 1951:2 
Thymelicus lineola: dos Passos 1964:14 (No. 123) 
Illinois records.—Map 17. 
This introduced European species (Fig. 1) 1s : 
cent adventive in Illinois. Much interest has atta 
to its spread in North America since its presence wa: 
covered in 1910. First found mine Chicago are 
1957, lineola is now well established in several locé 
there; new ones are found each year. The specie 
pears to be expanding its range beyond the Ch 
metropolitan area and in time will probably Ss] 
throughout the state (Irwin 1968). It sometimes re 
enormous abundance in a very restricted locality, ex 
