linear miner known from Alaska and N. 
Europe . 
2. Ligusticum grayi 
Mines with larvae were found in 
California, Nevada Co., Sagehen Creek, 
6. IX. 78 (KAS). The larva forms a 
narrow linear mine following the 
serrations of the leaf (fig. 1360); 
the puparium is black. Similar mines 
have been found in Alaska by 
Griffiths, and these probably 
represent the same species, 
tentatively identified as Phytomyza , 
n. sp. (p. 323). 
3. Sphenosciadium capitellatum 
Empty mines, California, El Dorado 
Co., Luther Pass, (?) date, Lot 106 - 1 
(KEF). These mines (fig. 1361) closely 
resemble those in No. 1 on Angelica , 
and it is possible that both are 
caused by the same species. 
Asteraceae 
4. Ageratina altissima 
Empty leaf mines on this host were 
common in Minnesota, Minnehaha Creek, 
29. VI. 80 (KAS); District of Columbia, 
Theodore Roosevelt Island, 2. VII. 80 
(KAS); and Wisconsin, Madison, June 
1980 (S. Tavormina). The mine (fig. 
1362) is long, narrow, with scarcely 
perceptible frass, frequently with 
several mines in the same leaf. It is 
probably caused by a Phytomyza sp. 
5. Agoseris , possibly A. glauca (det. 
J. L. Struther, UC, Berkeley) 
Empty mines were found on this host in 
California, Nevada Co., Sagehen Creek, 
6,200 ft, 6. IX. 78 (KAS). The larva 
forms a blotch mine at the apex of the 
leaf (fig. 1363), feeding downward and 
pupating externally. Frass is 
scattered in fine particles; this 
arrangement is more typical of 
Phytomyza than Liriomyza , but the 
genus of this species remains to be 
confirmed . 
6. Antennaria plantaginifolia 
Leaf mines with larvae were found in 
Arkansas, Garland Co., Hot Springs, 
15.V.79 (KAS). The larva feeds 
primarily in the midrib forming 
offshoots into the leaf blade (fig. 
1364), pupating at the leaf mine. The 
species probably belongs to the 
Phytomyza robustella group, but 
unfortunately no adults were reared. 
7. Arnica chamissonis ssp. foliosa 
California, Nevada Co., Sagehen Creek, 
6. IX. 78 (KAS). This mine (fig. 1365) 
represents either Phytomyza arnicae 
Hering or P. arnicicola Lundquist. 
Both form an upper surface blotch 
mine, pupating externally, and 
positive identification of the species 
is not possible from the mines. P. 
arnicae has been found in the Canadian 
Rockies, Alberta, and ]?. arnicicola 
has been recorded from Alaska, occurs 
in gardens in Edmonton, Alberta, and 
has now been recorded from Colorado 
(p. 310). Positive identification of 
the mines found at Sagehen Creek is 
not possible. 
8. Arnica chamissonis ssp. foliosa 
California, Nevada Co., Sagehen Creek, 
6. IX. 78 (KAS). This species 
represents either Phytomyza arnicivora 
Sehgal, 1971, or P. oreas Griffiths, 
1974b: 118. The mines of these two 
species are entirely linear, scarcely 
widening (fig. 1366), with the 
puparium remaining in the leaf on the 
lower surface and the anterior 
spiracles projecting through the 
epidermis. Separation of the two 
species by the mines alone is at the 
moment not possible. P. oreas has 
been recorded from the Canadian 
Rockies, British Columbia, and the 
Yukon Territory; P. arnicivora is 
known only from the holotype from the 
Canadian Rockies. Both species belong 
to the P. robustella group (see p. 322). 
The aedeagus of P. arnicivora was 
illustrated in side view by Sehgal 
(1971: fig. 854); the distiphallus of 
the holotype in ventral view is shown 
in figure 1367. 
9. Small an thus uvedalia 
Empty blotch mines (fig. 1368) were 
found in the District of Columbia, 
Theodore Roosevelt Island, 1. VII. 80 
(KAS). 
223 
