286 NEW YORK . STATE MUSEUM 



aa Thorax green or yellow ; if darker, then with distinct stripes 

 6 Dark brown or greenish species, thoracic stripes, usually dark 

 c Brownish species 



d Two mm. or less in length ; fore metatarsus but little longer than 



its tibia 4. d e f 1 e c t u s n. sp. 



dd Three mm. or more in length 



e Yellowish brown thorax with brownish stripes ; fore metatarsus 



1.5 times as long as its tibia 5. dives 



ee Fore metatarsus 1.3 times as long as its tibia 6. T . sp. 



cc Greenish species 



d Crossvein nearly in the middle of the wing ; length 2.5 to 3 mm. ; 



dark green species 7. j u n c i 



dd Crossvein noticeably before the middle of the wing 



e Fore metatarsus twice as long as its tibia 8. p u s i o 



ee Metatarsus of fore legs not twice as long as its tibia 

 f With dark brown thoracic stripes ; length 2 to 3 mm. 



9. f a t i g a n s n. sp. 

 ff With yellowish or brown thoracic stripes ; length 1.25 to 



1.75 mm 10. d i s s i m i 1 i s n. sp. 



5& Yellow species ; thoracic stripes when present, pale or reddish 



c Testaceous ; abdomen brown, segments with slightly paler margins ; 

 fore metatarsus one fourth longer than its tibia 



11. f u 1 v e s c e n s n. sp. 

 cc With yellowish green, or green abdomen 



d Fore metatarsus not more than one half longer than its tibia 

 e Fore metatarsus one half longer than its tibia ; yellowish green 



species, more or less dusky 10. dissirnilis n. sp. 



ee Fore metatarsus one third longer than its tibia ; paler species ; 



length 2.5 to 3 mm 12. m u t i c u s n. sp. 



dd Fore metatarsus more than 0.7 longer than its tibia 



e Species 2 mm. or more in length ; fore metatarsus twice as long 



as its tibia 14. t e n u i s 



ee Species less than 2 mm. in length 



f Fore metatarsus about three fourths longer than its tibia 



13. e x i g u u s n. sp. 

 ff Fore metatarsus about 2.5 times as long as its tibia 



15. f 1 a v e 1 1 u s 

 1. Tanytarsus obediens n. sp. 



(P1.30, fig. 14) 



Male. Subshining black; wings and legs cream white. Head 

 black, palpi, proboscis and antennae with its hairs fuscous, the 

 basal joint of the last yellowish. Thorax subshining black, 

 humeri sometimes slightly yellowish and dorsum with faint indi- 

 cations of two narrow cinereous lines, and three lines of yellow 

 hairs. Abdomen black, the posterior margins of all the segments 

 white or yellow; hairs yellowish; genitalia elongate, yellow. 

 Coxae brown; legs cream white, with white hairs; middle and 

 hind tibiae each with a minute black comb at the tip; fore tarsi 



