OF WASHINGTON, VOLUME XVI, 1914 . 149 



darker than the ground color. The tubercles are very dark sur- 

 rounded by pale yellowish. The first two tubercles on the side 

 of each segment are in a line, thus giving the appearance of a 

 narrow, broken, subdorsal band. The head is yellowish and the 

 cervical shield is pale spotted with the same color as the abdomi- 

 nal tubercles. The first larva spun its cocoon by July 17. The 

 cocoon is white, silky, spindle-shaped and is suspended within 

 the web. The larva eats off the tip of the leaf under the web. 

 Adults emerged August 6." 



Ectcedemia heinrichi n. sp. 



Face and head deep black; mouthparts yellowish; antennal eye-caps 

 large, creamy white; remainder of the antennae black with narrow yellow 

 annulations. Thorax light yellow sprinkled with black scales. Forewings 

 light ochreous profusely and irregularly sprinkled with blackish fuscous 

 scales; there are two, faint, poorly denned transverse fasciae on which the 

 dark scaling is less pronounced, one at basal third and one at apical third. 

 Apical cilia creamy white with a black basal line. Hindwing and underside 

 of all wings dark steely fuscous; cilia yellowish. Abdomen dark yellowish 

 fuscous, underside silvery. Legs golden yellow, posterior tibiae with strong 

 golden spines above. Alar expanse: 9-10 mm. 



Habitat: Falls Church, Virginia. 



Foodplant: Quercus palustris. 



Type: Cat. No. 19039, U. S. N. M. 



Named in honor of my friend and assistant Carl Heinrich, who 

 has ascertained the life history of this interesting species, which 

 makes a characteristic mine in the bark of young branches of 

 Quercus palustris. The mine is a narrow linear track, winding 

 closely upon itself in an oval spiral much like a compressed watch 

 spring, and showing very plainly in the bark (fig. 4). Old work 

 cracks and leaves the inner bark exposed. The work was found 

 only in this species of oak and mostly in the young saplings, al- 

 though a few mines were found on the outer branches of larger 

 trees. 



The larva is very similar to Ectcedemia cas/aneotBusck, but 

 rather larger and with more pronounced ventral processes. These 

 larvae become mature in late fall and were observed leaving their 

 mines from October 24 to November 5; they fall to the ground 

 and spin a small reddish brown, oval, flattened cocoon 2-2 1 mm. 

 broad and 3-4 mm. long; forced cocoons yielded moths in the lat- 

 ter part of March. 



The imagoes are very near to E. obrutella Zeller, but with much 

 darker dusting and with darker hind wings. 



