The Species of Diplotaxis Liable to Occur on Staten Island 1 



By Charles W. Leng 



Prof. H. C. Fall, of Pasadena, Cal., has recently published a 

 Revision of Diplotaxis, in the preparation of which Staten Island 

 specimens heretofore identified as tristis Kirby receive a new 

 name, atlantis. His work will make the identification of our 

 species easier, and permits of my making an abstract which covers 

 the species liable to occur on our Island. 



LARGE HAIRY SPECIES 



1. Upper surface with fulvous pubescence, dense and moderately long on 



the head and prothorax, shorter towards apex of elytra, 10-12 mm. 



sordida Say. 



Upper surface with grayish pubescence, sparser, erect but excessively 



short throughout, 11 mm. rugosioides Schaef. 



LARGE GLABROUS SPECIES 



2. Upper surface not hairy or pubescent. 



Mentum feebly oblique behind, strongly declivous in front, the de- 

 clivity more or less concave from side to side, its margin posteriorly 

 arcuate and convex, but without raised line; pygidium with a some- 

 what vaguely impressed longitudinal median line, 10-12 mm. 



atlantis Fall. 

 Mentum horizontal and nearly flat posteriorly, more or less declivous 

 in front, the declivity margined by a more or less arcuate raised line 

 and a row of erect setae. 



Thoracic angles more or less impressed. 



Prothorax more finely and evenly punctate ; color black, with- 

 out trace of metallic lustre; pygidium without impressed 

 line, 12-14 nrni- Can. to N. Y. tristis Kirby. 



Prothorax more coarsely and quite irregularly punctate; 

 elytra often with violaceous lustre; pygidium without im- 

 pressed line, 12-14 mm. Mass. to Ga. liberta Germ. 



1 Presented at the joint meeting of the Section of Biology and the New 

 York and Brooklyn Entomological Societies, May 8, 1909. 



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