Lyons, August 18, 1933, Mares (INHS) (Fig. 2). MeEr- 
cer County: Hamlet, September 5, 1953, Conway 
(Conway 1956). 
This species is probably only a rare casual in Illinois. 
Hemiargus isola (Reakirt) 
Reakirt’s blue 
Lycaena isola Reakirt 1866b:332 (type-locality “near 
Vera Cruz, Mexico”); Holland 1931:271. 
Hemuargus isolus: Klots 1951:159. 
Hemiargus isola: dos Passos 1964:63 (No. £35) 
Illinois records.—Map 61. 
C. L. Remington (1942) discussed isola in the Mid- 
west with special reference to Illinois. He indicated 
that isola is a breeding resident of the states east of the 
Mississippi in which it is found. Although it is appar- 
ently rare in these states, this rarity may be illusory rather 
than actual, since isola is widely overlooked where it 
does occur because of its close resemblance to Everes 
comyntas in the field. Collectors should keep this species 
in mind, and examine as many apparent “comyntas” 
as possible to locate it. 
Lycaeides melissa samuelis Nabokov 
Melissa blue, Karner blue 
Lycaeides melissa samuelis Nabokov 1943:97 (type-local- 
ity “Albany, New York’) ; Klots 1951: 165; dos Pas- 
sos 1964:64 (No. 455e). 
Lycaena scudderii: Worthington 1880: 48. 
Lycaena scudderi: Holland 1931:263. 
The only known Illinois specimens of this species are 
1 male and female in the INHS collection, from the 
\ndreas Bolter collection, labeled only “N. Ill.” (Fig. 
). The species was attributed to Illinois by Klots 
1951). Nabokov (1949) said that samuelis may occur 
n the “western side of the southern end of Lake Michi- 
an.” This may refer to the Waukegan Dunes (IIli- 
ois Beach State Park), an area apparently well suited 
o the occurrence of the species. The Dunes have, how- 
ver, been very well collected for many years, and we 
now of no samuelis from there in any collection. The 
ost, lupine (Lupinus perennis), occurs in “sandy soil, 
cal, Northern III.” according to Jones & Fuller (1955). 
f samuelis still occurs at all in the state, it must be in 
ery small, intensely localized colonies where the food 
lant occurs. Such a colony still exists near Hessville, 
ndiana, occupying an area only a few hundred square 
ards in size, beyond which samuelis very seldom strays. 
hapiro (1966) regarded this as the most local butter- 
y of the northeastern states. Downey (1966) also dis- 
used the occurrence of samuelis in Illinois. This is 
nother species which may have become extinct in IIli- 
ols since the time of Worthington and Bolter, as a 
ossible result of ecological changes. 
Everes comyntas ( Godart) 
Eastern tailed blue 
lyommatus comyntas Godart “1819” [1824]:660 (type- 
locality “North America’) . 
yeaena comyntas: Worthington 1880:48; Holland 
1931: 269, 
veres Comvntas: 
Klots 1951:163; dos Passos 1964:66 
(No. 469). 
5) 
Illinois records.—Map 62. 
This is one of the commonest butterflies of Illinois. 
It is abundant and generally distributed throughout the 
state. The name meinersi Field applies to the spring 
form of the species, in which females possess much blue 
dorsally. We have records of comyntas from nearly every 
county, more than for any other butterfly species. The 
earliest date of capture is April 21, and it has been taken 
as late as November 29 (Williamson County). 
The species is multiple-brooded, and adults often 
show a degree of seasonal variation. For example, spring 
males are usually paler than summer forms, and females 
show moderate to extensive blue scaling dorsally. Sum- 
mer females are dark brown dorsally with little or no 
blue scaling. 
Glaucopsyche lygdamus couperi Grote 
Silvery blue 
Glaucopsyche couperi Grote 1874:185 
“Anticosti Island”) . 
Lycaena lygdamas: Worthington 1880:48. 
Lycaena lygdamus: Holland 1931:262. 
Glaucopsyche lygdamus coupert: Klots 1951:168; dos 
Passos 1964:68 (No. 479c). 
Illinois records.—Map 63. 
Apparently limited to extreme northeastern Illinois, 
coupert (Fig. 2) has been locally common in the past 
but is now believed to be confined to only a few locali- 
ties. The principal colonies were at Palos Park, Cook 
County, and near Elgin, Kane County. We believe the 
species to be extinct at Palos Park, due to construction 
in the very restricted area where it occurred ; the last 
known captures there were by Leuschner in 1951 (REV: 
It apparently still survives near Elgin, where Bristol has 
taken it as recently as May 2, 1963 (JRH). The only 
other recent Illinois record is from near. Chain-o-Lakes 
Park, Lake County, May 23, 1954, Perkins (OAP). All 
other records are relatively old. There is one brood, 
and the species has been taken from April 13 through 
May 30. 
Holland (1931) thought that lygdamus and couperi 
were separate species, with the latter having a more 
boreal distribution, and lygdamus applying to our pop- 
ulation. Bower (1911) reported that the Palos Park 
populations utilized two species of Lathyrus as a lar- 
val food plant. Adults were on the wing in early May. 
(type-locality 
Celastrina argiolus pseudargiolus 
(Boisduval & Le Conte) 
Spring azure 
Argus pseudargiolus Boisduval & Le Conte 1833:118 
(type-locality “United States’). 
Lycaena pseudargiolus: Worthington 1880:48; Hol- 
Jand 1931:256. 
Lycaenopsis argiolus pseudargiolus: Klots 1951:169. 
Celastrina argiolus pseudargiolus: dos Passos 1964:69 
(No. 481b). 
Illinois records.—Map 64. 
This species is common and generally distributed 
throughout Illinois. It has exceedingly complex season- 
al variation and brood relationships. Spring individuals 
are smaller than those in the summer and tend to be 
confined to woods. Illinois spring material appears to 
