1080 WALTER H. WELLHOUSE 
Cosmopterygidae 
curvilineella Chamb., Blastodacna (Hawthorn fruit miner) 
The larvae of Blastodacna curvilineella are very commonly found 
tunneling in the fruit of native hawthorns in late summer. They become 
full-grown in September and October, when they leave the fruit and 
burrow into the ends of dead twigs or other decaying wood to hibernate. 
The hibernation cavity is lined with silk, and in the early spring pupation 
takes place there. The moths emerge in May and June. They are gray, 
with two or three indistinct dusky longitudinal short streaks on the 
wings, and have a wing expanse of 1 centimeter. 
The larva is from 9 to 10 millimeters long. In color it is yellowish 
white, with a brown head and thoracic legs, red spots near the spiracles, 
more or less blackish among the setae on the dorsum of each segment but 
especially moneeziole on the prothorax and the anal segment, and many 
hy He patches of black setae arranged as 
shown in figure 113. It feeds on the 
pulp of the fruit and leaves many 
brown pellets of excrement in the bur- 
row behind it. Often one whole side 
of a fruit is mined out, leaving only 
the skin to cover it. 
The moths have been bred from larvae in Crataegus pruinosa, C. neo- 
fiuvialis, and C. macracantha, and the larvae have been found in a number 
of other native hawthorns. The moth has been reported by Chambers 
from Kentucky (1872) and from Canada (1875), and therefore it probably 
occurs throughout the Eastern States. 
A closely related European species, B. hellerella Dup., feeds in the fruit 
of hawthorns and also bores into young apple shoots (page 1116). 
Fig. 113. LARVA OF BLASTODACNA 
CURVILINEELLA 
DIPTERA 
Cecidomyiidae (Itonididae) 
absobrina Felt, Rhizomyia 
crataegifolia Felt, Lestodiplosis (Hawthorn fringed-cup gall) 
Adults of both Rhizomyia absobrina and Lestodiplosis crataegifolia 
have been reared by Dr. Felt from larvae in the galls. The galls are 
green and cup-shaped, and are covered externally with round-tipped spines 
4 or 5 millimeters in diameter and about the same in height (figs. 114 and 
115). They occur on the larger veins and petioles of leaves and on the 
ends of young twigs of Crataegus pruinosa and C. macracantha, Several 
galls are commonly found in a group on the same or adjoining leaves. 
Those on the leaves are on the upper side, but extend through the leaves 
to form a smooth, semi-globular swelling on the lower side. 
