150 NEW YORK STATE MUSEUM 



flattened area in front of scutelluni with a whitish sheen. Abdo- 

 men of the male whitisli; the posterior segments sometimes with 

 reddish longitudinal strii>es. The abdomen of the female a pale 

 llesh color. Legs almost white. Fore metatarsus about three 

 fourths the length of its tibia; the fore tarsi of the male and the 

 hind legs hairy. Wings whitish, unspotted, witli pale hairs and 

 almost colorless veins; R. short, near "the tip of Ri api)earing 

 like a crossvein, but difticult to see on account of the hairs; the 

 cubitus forks i)roximad of the crossvein, the latter being proxi- 

 mad of the middle of the wing. Length 3.5 to 4.5 mm. Speci- 

 mens from Ithaca, N. Y.^ Michigan, Nebraska and New Jersey. 

 I can not distinguish the American specimens from those whicb 

 I have from Europe. The dorsal stripes of the thorax are buff- 

 colored, but they are usually distinct. 



Tar. 1). female. Thoracic stripes reddish. Length 2.5 mm. 

 From Ithaca, N. Y. 



16. Ablabesmyia flavifrons n. sp. 



Larva. The larvae were found rather abundantly in a small 

 ditch of flowing water. Ithaca, N. Y. 



Sordidly Avhite, slightly mottled with brownish ; length 9 mm. 

 Head pale brown, aibout 1.5 times as long as wide; the parts of 

 the head resemble those figured on pi. 20, fig.6. The antennae are 

 about 2.5 times as long as the mandible, the basal joint being 

 nearly seven eighths of the whole length. The maxilla is large, 

 the palpus prominent but shorter and stouter than that shown in 

 the above-mentioned figure (compare figs. 1 and 14). The labrum, 

 hypopharynx, and the feet are like those of ni o n i 1 i s (pi. 19, 

 fig.l4), but all the chiAvs of the posterior feet are of the same 

 color. 



Pupa. The only essential difference between this pupa and that 

 of m o n i 1 i s (pi. 19, fig.8) is the absence of the row of tubercles 

 at the base of the breathing trumpet and the form of the trumpet. 

 The latter is rather small, about two thirds as long as the third 

 abdominal segment, enlarged at the apical end (pi. 19, fig.2). 



Imago, male. Yellowish white and brown. Abdomen fasciate. 

 Legs pale. Length .3.5 to 4.5 mm. 



Head yellow, jialiii and tip of proboscis swbfuscous; basal joint 

 of the antenna dusky, flagellum brown with brown hairs, second 

 antennal joint yellotw. Pleura, scutellum and dorsum of thorax 

 pale yellow, the last with three broad, dull brown stripes, the 

 middle one divided; sternum and metanotum blackish. Abdomen 

 pale yellow, the anterior third or half of each segment brown; 

 genitalia and venter pale yellow. Legs yellowish, tarsi some- 



