304 [December 



forms me that Koch ignores the genus entirely. In this state of uncer- 

 tainty, I can only giiess and believe that Westwood was in error in stating 

 that the 3rd discoidal of Eriosoma is simple, not forked. But as giies- 

 slng is not hnowing^ and faitli is not science, and as I suspect, from the 

 circumstances under which the following species were found, that they do 

 not properly pertain to Eriosoma, I subjoin their leading generic characters. 

 Honey-tubes none; front wings with 3 discoidal veins, the first distant 

 at its origin from the second about one-half the length of the tarsus, the 

 third one-branched; hind wings with two simple discoidal veins. Anten- 

 nae short, 6-jointed, joint 3 as long as 4 — 6 put together, 4 and 5 some- 

 what obtrigonate, 6 lanceolate, nearly as long as 4 and 5 put together. 



Eriosoma T fungicola n. sp. From recent specimens. Body black, -with a plum- 

 like bloom; basal half of abdomen and the whole of venter yellow. Antennte and 

 legs black. Wings hyaline with a dusky tinge: veins dusky, black on the basal 

 half of the eosta; third discoidal hyaline nearly to its fork; stigma palish brown. 

 Numerous individuals, unaccompanied by larvae, occurred on a large, moist fungus 

 a hundred yards from the nearest trees which were all oaks. Beat solitary indi- 

 viduals unaccomj^anied by larvte or wooly matter, on two separate occasions from 

 oaks, which when dried differ only from the dried specimen of those found on fungus 

 by the metathorax being varied with pale greenish, as well as the base of the abdo- 

 men. Length to tip of wings .12 — .1.3 inch. 



The antennae do not quite attain the base of the first discoidal when the 

 wings are expanded, and the stigma is rather more than twice as long as 

 wide. Six specimens in all. U. qaerci Fitch is larger (.16 inch) and is 

 entirely black. Differs also from the other described U. S. species. 



Eriosoma? cornicola n. sp. 



Differs from the preceding only in the body being entirely black. Nu- 

 merous individual!?, unaccompanied by any flocculeut matter and so far as 

 I recollect by larva?, occurred in September on the lower side of the leaves 

 of the red osier dogwood. Ten specimens. 



THELAXES Westwood. (Fig. 5.) 



To this genus, which only differs from that to which the above two spe- 

 cies appertain in the wings being carried flat in repose, as in Cidlipfcrus 

 and Phylloxera, and in the hind wings having but one discoidal, belongs 

 Byrwcrypta ulmicohi Fitch, (elm) N. Y. Rep. II. § 257. Dr. Fitch had 

 not seen the winged insect, of which I have obtained many specimens. 

 No other N. A. species of this genus has hitherto been met with. 



