228 NEW YORK STATE MUSEUM 



third, though the setae near the posterior margin appear a little 

 more prominent. Near the posterior ventral margin of the first, 

 the anterior and posterior ventral margins of the second, and 

 sometimes on the anterior margin of the third also there is a row 

 of rather long, slender, conspicuous, pale setae. Each lateral fin 

 of the eighth segment has the usual set of four pale filaments and 

 a hrownish yellow slightly sinuous tooth (flg.8). The caudal fin 

 has the usual fringe of filaments. The dorsal surface of the first, 

 second and third segments is frequently slightly gray clouded. 



The larva and pupa of this species have also been described by 

 Dr Dyar (1902, p.57) from Bellport, N. Y. 



Imago, male. iStethidium yellowish, abdomen pea green. Eyes 

 black ; antennae, shaft brown, whitish at the base ; humerus, scutel 

 and intervals between the dilated lines of the thorax pale ; wings 

 immaculate, costal edge near the tip somewhat dusky; feet green- 

 ish white, anterior tibia and the tarsi dusky. Length one fifth of 

 an inch (=5 mm.). Pennsylvania (Say) ; New Jersey (Johnson) ; 

 Ithaca, N. Y. 



To Say's description, given above, may be added the following: 

 The female is like the male, but the antennae are more yellowish 

 and the abdomen more deeply green. The fore tarsi of the 

 male are nearly bare; the fore femur is about one third longer 

 than the tibia, while the metatarsus is about five sixths longer. 

 The male genitalia are figured on pl.32, fig.8, those of the female 

 in fig.ll. 



There appear to be several varieties of this species, differing 

 slightly in the adult state, and more distinctly in larval and 

 pupal stage. It is possible that when these and closely allied 

 species are better known, my varieties will be considered dis- 

 tinct species. 



Var. a. Larva reddish. The fourth albdominal segment of the 

 pupa as shown on pl.22, fig.l5; the lateral fin of the eighth seg- 

 ment with comb of several teeth (pl.22, fig.l6) . The imago differs 

 principally in being smaller, in length not exceeding 3 mm., while 

 the smallest specimens of the typical variety are over 3.5 mm. in 

 length. In color, too, they are more deeply green, including the 

 thorax and legs. The wing venation is as shown on pl.29, figs.l 

 and 2. 



Var. J). The pupa differs from those of the preceding varieties 

 principally in being devoid of spurs at the end of the lateral fin 

 of the eighth segment. The dorsal surface of segments 5 to 9 is 

 marked as shown on pl.22, fig.l4. The imago is about 3 mm. in 



