82 Bulletin of the Brooklyn Entomological Society Vol. XII 



The species was found only on the very young white ash plants 

 which grew in shady and damp places, the leaves of which ap- 

 peared to be infested by a mite. 



Xenoborus pettiti Renter. Breeds on Fraximis americana 

 and found in company with T. cardinalis and N. canadensis: 



Records: May 31 to June 16, Ithaca, N. Y. ; June 13 to June 

 30, Batavia, N. Y. ; June 22, Portage, N. Y. (H. H. Knight). 



Xenoborus neglectus new species. Resembles certain pale forms of pet- 

 titi; left genital clasper much longer and more spatulate toward the tip. 



S- Length 5.4 mm., width 2.1 mm. Black with pale. Antennae fuscous, 

 paler on the basal half of the first segment. Head with lower half of 

 the face fuscous, front pale and flecked with reddish ; carina and a small 

 median dash at the middle of the vertex blackish. Pronotum ecarinate, 

 punctuation and pubescence nearly as in pettiti; collar and large median 

 spot or ray on the disk, white or pale yellow; pale ray from behind the 

 calli extending along the margin of the disk and widening to the basal 

 angles ; scutellum pale yellowish, mesoscutum blackish. Hemelytra black- 

 ish, embolium, basal angle of the corium and entire cuneus, clear; mem- 

 brane fuscous, in the female paler in the middle. Legs pale yellowish, the 

 hind femora indistinctly marked with fuscous at the apices. 



Holotype: S, June 17-20, Mud Creek, Tompkins Co., N. Y. ; Cornell 

 University Collection. 



Allotype: June 18, Batavia, N. Y. (H. H. Knight). 



The writer has found this species rather scarce though systematic col- 

 lecting during June may show that it is present in greater numbers. The 

 writer ventures to guess that it will be found on the black ash when that 

 plant is thoroughly worked in June. 



Xenoborus plagifer Renter. The writer collected in the vicinity 

 of Batavia for three seasons before taking this and the follow- 

 ing species. It breeds only on the black ash (F. nigra) which 

 grows in dense swampy woods. Once having found the food 

 plant a large series was obtained by sweeping the host plant. 



Records: ^ July 30, 2 ^ Aug. i, 39 J*? Aug. 6, ? Aug. 9, 

 5 c^? Aug. 10, 27 c^5 Aug. 12, Batavia, N. Y. (H. H. Knight). 



Xenoborus commissuralis Renter. This pretty species was 

 found on Fraxinus nigra in company with plagifer and was taken 

 in greater numbers. 



Records: 14 J*$ July 29, 123 c^? July 30, 40 ^^5 Aug. i, Batavia, 

 N. Y. (H. H. Knight). 



