292 NEW YORK STATE MUSEUM 



9. Tanytarsus fatigans n. sp. 

 (P1.30, fig.18) 



Female. Head greenish; palpi, and antennae except basal joint, 

 infuscated; proboscis 3'ellow. Thorax greenish, with three dark 

 subshining, brown or blackish stripes; scutellum and pleura pale 

 greenish or yellow ; metanotura and sternum blackish. Abdomen 

 grass-green. Legs pale yellowish, slightly infuscated; hairs not 

 iong ; fore metatarsus over one third longer than the tibia. Wings 

 hyaline, sparsely haired, veins yellowish, venation as figured. 

 Halteres gTeenish. Length, 2 to 3 mm. 



Var. a. One female specimen has darker face, proboscis, and 

 fuscous legs, othen\ise agrees with the above description. Taken 

 at same time and place. Ithaca N. Y., April. 



10. Tanytarsus dissimilis n. sp. 

 (P1.25, figs. 16 to 21) 



Larva. Small, white, with brownish tint; found among the 

 trash in the bottom of a muddy pond. Length 3 to 4 mm. Head 

 pale brown, short, with a few dorsal setae. Eye spots, a pair on 

 each side, distinctly separated, antennae nearly double the length 

 of the mandible (fig.17). Labrum with a number of prominent 

 curved setae, some of them pectinate (fig.lG 1) ; epipharynx nor- 

 mal (fig.l6). Mandible with a subapical and a lateral seta and 

 a row of fine hairs overhanging the tip. Maxilla with a short 

 palpus, some small papillae and several slender, pointed, mesad 

 projecting lobes (fig.lG mx). The anterior feet are provided with 

 numerous pale curved setae. Thorax with a few pale and very 

 inconspicuous setae. Claws of the posterior prolegs few in num- 

 ber and bilobed. Caudal blood gills four in number and rather 

 prominent. C/iudal setae brown ; a single shorter and more 

 delicate seta is placed upon oacli pedicel upon its anterior side. 



Pupa. Pale yellowish; length about 3 mm. Thorax with long, 

 slender pointed respiratory organs with hairs upon them. Upon 

 the thorax caudad of the middle are a few rather conspicuous 

 setae. The second, third, fourth and fifth abdominal segments 

 are marked as shown on pl.25, fig.20. The second has two gray 

 triangular pigment spots, their bases near the posterior margin ; 

 a few small setae, and the usual transverse posterior row of longi- 

 tudinal ridges; the third has a broken transverse posterior row 

 of long and prominent black setae, besides a few scattered ones; 

 the fourth has an anterior row which joins the cephalic ends 

 of the two longitudinal rows of long black setae and an anterior 

 median patch of short, stout, black spines, besides several scat- 

 tered selae; the fifth has two contiguous or nearly contiguous 

 patches near the anterior margin of short stout black spines, and 



